ISP1122ABD - Philips Semiconductors / NXP Semiconductors

ISP1122A

Universal Serial Bus stand-alone hub

Rev. 01 — 27 March 2000 Preliminary speciﬁcation

1. General description

The ISP1122A is a stand-alone Universal Serial Bus (USB) hub device which

complies with

USB Speciﬁcation Rev. 1.1

. It integrates a Serial Interface Engine

(SIE), hub repeater, hub controller, USB data transceivers and a 3.3 V voltage

regulator. It has a conﬁgurable number of downstream ports, ranging from 2 to 5.

The ISP1122A can be bus-powered, self-powered or hybrid-powered. When it is

hybrid-powered the hub functions are powered by the upstream power supply (VBUS),

but the downstream ports are powered by an external 5 Volt supply. The low power

consumption in ‘suspend’ mode allows easy design of equipment that is compliant

with the ACPI™, OnNow™ and USB power management requirements.

The ISP1122A has built-in overcurrent sense inputs, supporting individual and global

overcurrent protection for downstream ports. All ports (including the hub) have

GoodLink™ indicator outputs for easy visual monitoring of USB trafﬁc. The ISP1122A

has a serial I2C-bus interface for external EEPROM access and a reduced frequency

(6 MHz) crystal oscillator. These features allow signiﬁcant cost savings in system

design and easy implementation of advanced USB functionality into PC peripherals.

2. Features

■High performance USB hub device with integrated hub repeater, hub controller,

Serial Interface Engine (SIE), data transceivers and 3.3 V voltage regulator

■Complies with

Universal Serial Bus Speciﬁcation Rev. 1.1

and ACPI, OnNow and

USB power management requirements

■Conﬁgurable from 2 to 5 downstream ports with automatic speed detection

■Internal power-on reset and low voltage reset circuit

■Supports bus-powered, hybrid-powered and self-powered application

■Individual or ganged power switching for downstream ports

■Individual or global port overcurrent protection with built-in sense circuits

■6 MHz crystal oscillator with on-chip PLL for low EMI

■Visual USB trafﬁc monitoring (GoodLink™) for hub and downstream ports

■I2C-bus interface to read vendor ID, product ID and conﬁguration bits from

external EEPROM

■Operation over the extended USB bus voltage range (4.0 to 5.5 V)

■Operating temperature range −40 to +85 °C

■8 kV in-circuit ESD protection for lower cost of external components

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 2 of 48

■Full-scan design with high test coverage

■Available in 32-pin SDIP, SO and LQFP packages.

3. Ordering information

4. Block diagram

Table 1: Ordering information

Type number Package

Name Description Version

ISP1122AD SO32 plastic small outline package; 32 leads; body width 7.5 mm SOT287-1

ISP1122ANB SDIP32 plastic shrink dual in-line package; 32 leads (400 mil) SOT232-1

ISP1122ABD LQFP32 plastic low proﬁle quad ﬂat package; 32 leads; body 7 x 7 x 1.4 mm SOT358-1

This is a conceptual block diagram and does not include each individual signal.

Fig 1. Block diagram.

width

MBL169

I2C-BUS

INTERFACE

HUB

REPEATER

ISP1122A

ANALOG

Tx/Rx

D+D−overcurrent

detection

downstream

port 1

LED/

power switch

GoodLink/

POWER SWITCH/

OC DETECT

ANALOG

Tx/Rx

D+D−overcurrent

detection

downstream

port 2

LED/

power switch

GoodLink/

POWER SWITCH/

OC DETECT

ANALOG

Tx/Rx

D+D−overcurrent

detection

downstream

port 3

LED/

power switch

GoodLink/

POWER SWITCH/

OC DETECT

ANALOG

Tx/Rx

D+D−overcurrent

detection

downstream

port 4

LED/

power switch

GoodLink/

POWER SWITCH/

OC DETECT

ANALOG

Tx/Rx

D+D−

full

speed

upstream

port

LED

HUB

GoodLink

ANALOG

Tx/Rx

D+D−overcurrent

detection

self/bus

powered

downstream

port 5

LED/

power switch

GoodLink/

POWER SWITCH/

OC DETECT

HUB

CONTROLLER

PACKET

GENERATOR

GENERAL

PORT

CONTROLLER

END OF

FRAME

TIMERS

PHILIPS

SIE

BIT CLOCK

RECOVERY

PLL

6 MHz

SUPPLY

REGULATOR

VCC

3.3 V

5 V

Vreg(3.3)

SDA

INDV

OPTION

SCL

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 3 of 48

5. Pinning information

5.1 ISP1122AD (SO32) and ISP1122ANB (SDIP32)

5.1.1 Pinning

5.1.2 Pin description

Fig 2. Pin conﬁguration SO32. Fig 3. Pin conﬁguration SDIP32.

handbook, halfpage

ISP1122AD

MBL163

Vreg(3.3)

GND

DM3

DP3

VCC

DM4

DP4

DP2

DM2

DP0

DP1

DM1

DM0

DP5

DM5

INDV/SDA

OPTION/SCL

XTAL2

XTAL1

PSW1/GL1

RESET

PSW5/GL5/GPSW

PSW4/GL4PSW3/GL3

HUBGL

SP/BP

OC5/GOC

PSW2/GL2

OC1

OC2

OC3

OC4

handbook, halfpage

ISP1122ANB

MBL164

Vreg(3.3)

GND

DM3

DP3

VCC

DM4

DP4

DP2

DM2

DP0

DP1

DM1

DM0

DP5

DM5

INDV/SDA

OPTION/SCL

XTAL2

XTAL1

PSW1/GL1

RESET

PSW5/GL5/GPSW

PSW4/GL4PSW3/GL3

HUBGL

SP/BP

OC5/GOC

PSW2/GL2

OC1

OC2

OC3

OC4

Table 2: Pin description for SO32 and SDIP32

Symbol[1] Pin Type Description

Vreg(3.3) [2] 1 - regulated supply voltage (3.3 V ±10%) from internal

regulator; used to connect pull-up resistor on DP0 line

PSW2/GL2[3] 2Omodes 4 to 6: power switch control output for downstream

port 2 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 2 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

GND 3 - ground supply

DM3 4 AI/O downstream port 3 D− connection (analog)[4]

DP3 5 AI/O downstream port 3 D+ connection (analog)[4]

VCC 6 - supply voltage; connect to USB supply VBUS (bus-powered or

hybrid-powered) or to local supply VDD (self-powered)

OC1 7 AI/I overcurrent sense input for downstream port 1 (analog[5])

OC2 8 AI/I overcurrent sense input for downstream port 2 (analog[5])

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 4 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
OC3 9 AI/I overcurrent sense input for downstream port 3 (analog[5])
OC4 10 AI/I overcurrent sense input for downstream port 4 (analog[5])
OC5/GOC[3] 11 AI/I modes 5, 7: overcurrent sense input for downstream port 5
(analog[5])
modes 0, 1, 3: global overcurrent sense input (analog[5])
DM4 12 AI/O downstream port 4 D− connection (analog)[4]
DP4 13 AI/O downstream port 4 D+ connection (analog)[4]
SP/BP 14 I selects power mode:
self-powered: connect to VDD (local power supply); also use
this mode for hybrid-powered operation
bus-powered: connect to GND; disable downstream port 5 to
meet supply current requirements[4]
HUBGL 15 O hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330 Ω series resistor; if unused
connect to VCC via a 10 kΩ resistor
PSW3/GL3[3] 16 O modes 4 to 6: power switch control output for downstream
port 3 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 3 (open-drain, 6 mA); to connect an LED
use a 330 Ω series resistor
PSW4/GL4[3] 17 O modes 4 to 6: power switch control output for downstream
port 4 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 4 (open-drain, 6 mA); to connect an LED
use a 330 Ω series resistor
PSW5/GL5/
GPSW[3] 18 O mode 5: power switch control output for downstream port 5
(open-drain, 6 mA)
modes 3, 7: GoodLink LED indicator output for downstream
port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω
series resistor
modes 0 to 2: gang mode power switch control output
(open-drain, 6 mA)
XTAL1 19 I crystal oscillator input (6 MHz)
XTAL2 20 O crystal oscillator output (6 MHz)
RESET[2] 21 I reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to VCC for power-on reset
(internal POR circuit)
OPTION/SCL 22 I/O mode selection input; also functions as I2C-bus clock output
(open-drain, 6 mA)
INDV/SDA 23 I/O selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I2C-bus data line (open-drain, 6 mA)
DM5 24 AI/O downstream port 5 D− connection (analog)[4]
DP5 25 AI/O downstream port 5 D+ connection (analog)[4]
DM1 26 AI/O downstream port 1 D− connection (analog)[6]
DP1 27 AI/O downstream port 1 D+ connection (analog)[6]
Table 2: Pin description for SO32 and SDIP32
…continued
Symbol[1] Pin Type Description

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 5 of 48

[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.

[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by

connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.

[3] See Table 4 “Mode selection”.

[4] To disable a downstream port connect both D+and D−to VCC via a 1 MΩresistor; unused ports must

be disabled in reverse order starting from port 5.

[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,

the pin functions as a logic input (TTL level).

[6] Downstream ports 1 and 2 cannot be disabled.

DM0 28 AI/O upstream port D− connection (analog)

DP0 29 AI/O upstream port D+ connection (analog)

DM2 30 AI/O downstream port 2 D− connection (analog)[6]

DP2 31 AI/O downstream port 2 D+ connection (analog)[6]

PSW1/GL1[3] 32 O modes 4 to 6: power switch control output for downstream

port 1 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 1 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

Table 2: Pin description for SO32 and SDIP32

…continued

Symbol[1] Pin Type Description

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 6 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
5.2 ISP1122ABD (LQFP32)
5.2.1 Pinning
5.2.2 Pin description
Fig 4. Pin conﬁguration LQFP32.
handbook, full pagewidth
ISP1122ABD
MBL165
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
DM3
GND
PSW2/GL2
Vreg(3.3)
PSW1/GL1
DP2
DM2
DP0
DP4
SP/BP
HUBGL
PSW3/GL3
PSW4/GL4
PSW5/GL5/GPSW
XTAL1
XTAL2
DP3
VCC
OC1
DM4
DM0
DP1
DM1
DP5
DM5
INDV/SDA
OPTION/SCL
RESET
OC2
OC3
OC4
OC5/GOC
Table 3: Pin description for LQFP32
Symbol[1] Pin Type Description
Vreg(3.3) [2] 29 - regulated supply voltage (3.3 V ±10%) from internal
regulator; used to connect pull-up resistor on DP0 line
PSW2/GL2[3] 30 O modes 4 to 6: power switch control output for downstream
port 2 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 2 (open-drain, 6 mA); to connect an LED
use a 330 Ω series resistor
GND 31 - ground supply
DM3 32 AI/O downstream port 3 D− connection (analog)[4]
DP3 1 AI/O downstream port 3 D+ connection (analog)[4]
VCC 2 - supply voltage; connect to USB supply VBUS (bus-powered or
hybrid-powered) or to local supply VDD (self-powered)
OC1 3 AI/I overcurrent sense input for downstream port 1 (analog[5])
OC2 4 AI/I overcurrent sense input for downstream port 2 (analog[5])
OC3 5 AI/I overcurrent sense input for downstream port 3 (analog[5])
OC4 6 AI/I overcurrent sense input for downstream port 4 (analog[5])

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 7 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
OC5/GOC[3] 7 AI/I modes 5, 7: overcurrent sense input for downstream port 5
(analog[5])
modes 0, 1, 3: global overcurrent sense input (analog[5])
DM4 8 AI/O downstream port 4 D− connection (analog)[4]
DP4 9 AI/O downstream port 4 D+ connection (analog)[4]
SP/BP 10 I selects power mode:
self-powered: connect to VDD (local power supply); also use
this mode for hybrid-powered operation
bus-powered: connect to GND; disable downstream port 5 to
meet supply current requirements[4]
HUBGL 11 O hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330 Ω series resistor; if unused
connect to VCC via a 10 kΩ resistor
PSW3/GL3[3] 12 O modes 4 to 6: power switch control output for downstream
port 3 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 3 (open-drain, 6 mA); to connect an LED
use a 330 Ω series resistor
PSW4/GL4[3] 13 O modes 4 to 6: power switch control output for downstream
port 4 (open-drain, 6 mA)
modes 0 to 3, 7: GoodLink LED indicator output for
downstream port 4 (open-drain, 6 mA); to connect an LED
use a 330 Ω series resistor
PSW5/GL5/
GPSW[3] 14 O mode 5: power switch control output for downstream port 5
(open-drain, 6 mA)
modes 3, 7: GoodLink LED indicator output for downstream
port 5 (open-drain, 6 mA); to connect an LED use a 330 Ω
series resistor
modes 0 to 2: gang mode power switch control output
(open-drain, 6 mA)
XTAL1 15 I crystal oscillator input (6 MHz)
XTAL2 16 O crystal oscillator output (6 MHz)
RESET[2] 17 I reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to VCC for power-on reset
(internal POR circuit)
OPTION/SCL 18 I/O mode selection input; also functions as I2C-bus clock output
(open-drain, 6 mA)
INDV/SDA 19 I/O selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I2C-bus data line (open-drain, 6 mA)
DM5 20 AI/O downstream port 5 D− connection (analog)[4]
DP5 21 AI/O downstream port 5 D+ connection (analog)[4]
DM1 22 AI/O downstream port 1 D− connection (analog)[6]
DP1 23 AI/O downstream port 1 D+ connection (analog)[6]
DM0 24 AI/O upstream port D− connection (analog)
DP0 25 AI/O upstream port D+ connection (analog)
Table 3: Pin description for LQFP32
…continued
Symbol[1] Pin Type Description

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 8 of 48

[1] Symbol names with an overscore (e.g. NAME) indicate active LOW signals.

[2] The voltage at pin Vreg(3.3) is gated by the RESET pin. This allows fully self-powered operation by

connecting RESET to VBUS (+5 V USB supply). If VBUS is lost upstream port D+ will not be driven.

[3] See Table 4 “Mode selection”.

[4] To disable a downstream port connect both D+and D−to VCC via a 1 MΩresistor; unused ports must

be disabled in reverse order starting from port 5.

[5] Analog detection circuit can be switched off using an external EEPROM, see Table 23; in this case,

the pin functions as a logic input (TTL level).

[6] Downstream ports 1 and 2 cannot be disabled.

6. Functional description

The ISP1122A is a stand-alone USB hub with up to 5 downstream ports. The number

of ports can be conﬁgured between 2 and 5. The downstream ports can be used to

connect low-speed or full-speed USB peripherals. All standard USB requests from

the host are handled by the hardware without the need for ﬁrmware intervention. The

block diagram is shown in Figure 1.

The ISP1122A requires only a single supply voltage. An internal 3.3 V regulator

provides the supply voltage for the analog USB data transceivers.

The ISP1122A supports both bus-powered and self-powered hub operation. When

using bus-powered operation a downstream port cannot supply more than 100 mA to

a peripheral. In case of self-powered operation an external supply is used to power

the downstream ports, allowing a current consumption of max. 500 mA per port.

A basic I2C-bus interface is provided for reading vendor ID, product ID and

conﬁguration bits from an external EEPROM upon a reset.

6.1 Analog transceivers

The integrated transceiver interfaces directly to the USB cables through external

termination resistors. They are capable of transmitting and receiving serial data at

both ‘full-speed’ (12 Mbit/s) and ‘low-speed’ (1.5 Mbit/s) data rates. The slew rates

are adjusted according to the speed of the device connected and lie within the range

mentioned in the

USB Speciﬁcation Rev. 1.1

DM2 26 AI/O downstream port 2 D− connection (analog)[6]

DP2 27 AI/O downstream port 2 D+ connection (analog)[6]

PSW1/GL1[3] 28 O modes 4 to 6: power switch control output for downstream

port 1 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 1 (open-drain, 6 mA); to connect an LED

use a 330 Ω series resistor

Table 3: Pin description for LQFP32

…continued

Symbol[1] Pin Type Description

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 9 of 48

6.2 Philips Serial Interface Engine (SIE)

The Philips SIE implements the full USB protocol layer. It is completely hardwired for

speed and needs no ﬁrmware intervention. The functions of this block include:

synchronization pattern recognition, parallel/serial conversion, bit (de-)stufﬁng, CRC

checking/generation, Packet IDentiﬁer (PID) veriﬁcation/generation, address

recognition, handshake evaluation/generation.

6.3 Hub repeater

The hub repeater is responsible for managing connectivity on a ‘per packet’ basis. It

implements ‘packet signalling’ and ‘resume’ connectivity. Low-speed devices can be

connected to downstream ports. If a low-speed device is detected the repeater will

not propagate upstream packets to the corresponding port, unless they are preceded

by a PREAMBLE PID.

6.4 End-of-frame timers

This block contains the speciﬁed EOF1 and EOF2 timers which are used to detect

‘loss-of-activity’ and ‘babble’ error conditions in the hub repeater. The timers also

maintain the low-speed keep-alive strobe which is sent at the beginning of a frame.

6.5 General and individual port controller

The general and individual port controllers together provide status and control of

individual downstream ports. Any port status change will be reported to the host via

the hub status change (interrupt) endpoint.

6.6 GoodLink

Indication of a good USB connection is provided through GoodLink technology. An

LED can be directly connected via an external 330 Ω resistor.

During enumeration the LED blinks on momentarily. After successful conﬁguration of

the ISP1122A, the LED is permanently on. The LED blinks off for 100 ms upon each

successful packet transfer (with ACK). The hub GoodLink indicator blinks when the

hub receives a packet addressed to it. Downstream GoodLink indicators blink upon

an acknowledgment from the associated port. In ‘suspend’ mode the LED is off.

This feature provides a user-friendly indication of the status of the hub, the connected

downstream devices and the USB trafﬁc. It is a useful diagnostics tool to isolate faulty

USB equipment and helps to reduce ﬁeld support and hotline costs.

6.7 Bit clock recovery

The bit clock recovery circuit recovers the clock from the incoming USB data stream

using a 4×oversampling principle. It is able to track jitter and frequency drift as

speciﬁed by the

USB Speciﬁcation Rev. 1.1

6.8 Voltage regulator

A 5 to 3.3 V DC-DC regulator is integrated on-chip to supply the analog transceiver

and internal logic. This can also be used to supply the terminal 1.5 kΩpull-up resistor

on the D+ line of the upstream connection.

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 10 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
6.9 PLL clock multiplier
A 6 to 48 MHz clock multiplier Phase-Locked Loop (PLL) is integrated on-chip. This
allows for the use of low-cost 6 MHz crystals. The low crystal frequency also
minimizes Electro-Magnetic Interference (EMI). The PLL requires no external
components.
6.10 Overcurrent detection
An overcurrent detection circuit for downstream ports has been integrated on-chip. It
is self-reporting, resets automatically, has a low trip time and requires no external
components. Both individual and global overcurrent detection are supported.
6.11 I2C-bus interface
A basic serial I2C-bus interface (single master, 100 kHz) is provided to read VID, PID
and conﬁguration bits from an external I2C-bus EEPROM (e.g. Philips PCF8582 or
equivalent). At reset the ISP1122A reads 6 bytes of data from the external memory.
The I2C-bus interface timing complies with the standard mode of operation as
described in
The I
2
C-bus and how to use it
, order number 9398 393 40011.
7. Modes of operation
The ISP1122A has several modes of operation, each corresponding with a different
pin conﬁguration. Modes are selected by means of pins INDV, OPTION and SP/BP,
as shown in Table 4.
[1] Port power switching: logic 0 = ganged, logic 1 = individual.
[2] Power mode: logic0=bus-powered, logic 1 = self-powered (or hybrid-powered).
[3] No overcurrent detection.
[4] No power switching.
Table 4: Mode selection
Mode INDV
[1] OPTION SP/BP
[2] PSWn/GLn
(n = 1 to 4) PSW5/GL5/GPSW OCn
(n = 1 to 4) OC5/GOC
0000GoodLink ganged power inactive global overcurrent
1001GoodLink ganged power inactive global overcurrent
2010GoodLink ganged power inactive[3] inactive[3]
3011GoodLink[4] GoodLink[4] inactive global overcurrent
4100individual power inactive individual
overcurrent inactive
5101individual power individual power individual
overcurrent individual
overcurrent
6110individual power inactive inactive[3] inactive[3]
7111GoodLink[4] GoodLink[4] individual
overcurrent individual
overcurrent

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 11 of 48

8. Endpoint descriptions

Each USB device is logically composed of several independent endpoints. An

endpoint acts as a terminus of a communication ﬂow between the host and the

device. At design time each endpoint is assigned a unique number (endpoint

identiﬁer, see Table 5). The combination of the device address (given by the host

during enumeration), the endpoint number and the transfer direction allows each

endpoint to be uniquely referenced.

The ISP1122A has two endpoints, endpoint 0 (control) and endpoint 1 (interrupt).

[1] IN: input for the USB host; OUT: output from the USB host.

8.1 Hub endpoint 0 (control)

All USB devices and functions must implement a default control endpoint (ID = 0).

This endpoint is used by the host to conﬁgure the device and to perform generic USB

status and control access.

The ISP1122A hub supports the following USB descriptor information through its

control endpoint 0, which can handle transfers of 64 bytes maximum:

•Device descriptor

•Conﬁguration descriptor

•Interface descriptor

•Endpoint descriptor

•Hub descriptor

•String descriptor.

8.2 Hub endpoint 1 (interrupt)

Endpoint 1 is used by the ISP1122A hub to provide status change information to the

host. This endpoint can be accessed only after the hub has been conﬁgured by the

host (by sending the Set Conﬁguration command).

Endpoint 1 is an interrupt endpoint: the host polls it once every 255 ms by sending an

IN token. If the hub has detected no change in the port status it returns a NAK (Not

AcKnowledge) response to this request, otherwise it sends the Status Change byte

(see Table 6).

Table 5: Hub endpoints

Function Ports Endpoint

identiﬁer Transfer

type Direction[1] Max. packet

size (bytes)

Hub 0: upstream

1 to 5: downstream 0 control OUT 64

IN 64

1 interrupt IN 1

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 12 of 48

9. Host requests

The ISP1122A handles all standard USB requests from the host via control

endpoint 0. The control endpoint can handle a maximum of 64 bytes per transfer.

Remark: Please note that the USB data transmission order is Least Signiﬁcant Bit

(LSB) ﬁrst. In the following tables multi-byte variables are displayed least signiﬁcant

byte ﬁrst.

9.1 Standard requests

Table 7 shows the supported standard USB requests. Some requests are explicitly

unsupported. All other requests will be responded with a STALL packet.

Table 6: Status Change byte: bit allocation

Bit Symbol Description

0 Hub SC a logic 1 indicates a status change on the hub’s upstream port

1 Port 1 SC a logic 1 indicates a status change on downstream port 1

2 Port 2 SC a logic 1 indicates a status change on downstream port 2

3 Port 3 SC a logic 1 indicates a status change on downstream port 3

4 Port 4 SC a logic 1 indicates a status change on downstream port 4

5 Port 5 SC a logic 1 indicates a status change on downstream port 5

6 reserved not used

7 reserved not used

Table 7: Standard USB requests

Request name bmRequestType

byte 0 [7:0]

(Bin)

bRequest

byte 1

(Hex)

wValue

byte 2, 3

(Hex)

wIndex

byte 4, 5

(Hex)

wLength

byte 6, 7

(Hex)

Data

Address

Set Address X000 0000 05 address[1] 00, 00 00, 00 none

Conﬁguration

Get Conﬁguration 1000 0000 08 00, 00 00, 00 01, 00 conﬁguration

value = 01H

Set Conﬁguration (0) X000 0000 09 00, 00 00, 00 00, 00 none

Set Conﬁguration (1) X000 0000 09 01, 00 00, 00 00, 00 none

Descriptor

Get Conﬁguration

Descriptor 1000 0000 06 00, 02 00, 00 length[2] conﬁguration,

interface and

endpoint

descriptors

Get Device Descriptor 1000 0000 06 00, 01 00, 00 length[2] device

descriptor

Get String Descriptor (0) 1000 0000 06 03, 00 00, 00 length[2] language ID

string

Get String Descriptor (1) 1000 0000 06 03, 01 00, 00 length[2] manufacturer

string

Get String Descriptor (2) 1000 0000 06 03, 02 00, 00 length[2] product string

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 13 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
[1] Device address: 0 to 127.
[2] Returned value in bytes.
[3] MSB speciﬁes endpoint direction: 0 = OUT, 1 = IN. The ISP1122A accepts either value.
9.2 Hub speciﬁc requests
In Table 8 the supported hub speciﬁc requests are listed, as well as some
unsupported requests. Table 9 provides the feature selectors for setting or clearing
port features.
Feature
Clear Device Feature
(REMOTE_WAKEUP) X000 0000 01 01, 00 00, 00 00, 00 none
Clear Endpoint (1)
Feature (HALT/STALL) X000 0010 01 00, 00 81, 00 00, 00 none
Set Device Feature
(REMOTE_WAKEUP) X000 0000 03 01, 00 00, 00 00, 00 none
Set Endpoint (1)
Feature (HALT/STALL) X000 0010 03 00, 00 81, 00 00, 00 none
Status
Get Device Status 1000 0000 00 00, 00 00, 00 02, 00 device status
Get Interface Status 1000 0001 00 00, 00 00, 00 02, 00 zero
Get Endpoint (0) Status 1000 0010 00 00, 00 00/80[3], 00 02, 00 endpoint 0
status
Get Endpoint (1) Status 1000 0010 00 00, 00 81, 00 02, 00 endpoint 1
status
Unsupported
Set Descriptor 0000 0000 07 XX, XX XX, XX XX, XX descriptor;
STALL
Get Interface 1000 0001 0A 00, 00 XX, XX 01, 00 STALL
Set Interface X000 0001 0B XX, XX XX, XX 00, 00 STALL
Synch Frame 1000 0010 0C 00, 00 XX, XX 02, 00 STALL
Table 7: Standard USB requests
…continued
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Table 8: Hub speciﬁc requests
Request name bmRequestType
byte 0 [7:0]
(Bin)
bRequest
byte 1
(Hex)
wValue
byte 2, 3
(Hex)
wIndex
byte 4, 5
(Hex)
wLength
byte 6, 7
(Hex)
Data
Descriptor
Get Hub Descriptor 1010 0000 06 00, 00/29[1] 00, 00 length[2], 00 hub descriptor
Feature
Clear Hub Feature
(C_LOCAL_POWER) X010 0000 01 00, 00 00, 00 00, 00 none
Clear Port Feature
(feature selectors) X010 0011 01 feature[3], 00 port[4], 00 00, 00 none
Set Port Feature
(feature selectors) X010 0011 03 feature[3], 00 port[4], 00 00, 00 none

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 14 of 48

[1]

USB Speciﬁcation Rev. 1.0

uses 00H,

USB Speciﬁcation Rev. 1.1

speciﬁes 29H.

[2] Returned value in bytes.

[3] Feature selector value, see Table 9.

[4] Downstream port identiﬁer: 1 to N with N = number of enabled ports (2 to 5).

Status

Get Hub Status 1010 0000 00 00, 00 00, 00 04, 00 hubstatusand

status change

ﬁeld

Get Port Status 1010 0011 00 00, 00 port[4], 00 04, 00 port status

Unsupported

Get Bus Status 1010 0011 02 00, 00 port[4], 00 01, 00 STALL

Clear Hub Feature

(C_OVER_CURRENT) X010 0000 01 01, 00 00, 00 00, 00 STALL

Set Hub Descriptor 0010 0000 07 XX, XX 00, 00 3E, 00 STALL

Set Hub Feature

(C_LOCAL_POWER) X010 0000 03 00, 00 00, 00 00, 00 STALL

Set Hub Feature

(C_OVER_CURRENT) X010 0000 03 01, 00 00, 00 00, 00 STALL

Table 8: Hub speciﬁc requests

…continued

Request name bmRequestType

byte 0 [7:0]

(Bin)

bRequest

byte 1

(Hex)

wValue

byte 2, 3

(Hex)

wIndex

byte 4, 5

(Hex)

wLength

byte 6, 7

(Hex)

Data

Table 9: Port feature selectors

Feature selector name Value (Hex) Set feature Clear feature

PORT_CONNECTION 00 not used not used

PORT_ENABLE 01 not used disables a port

PORT_SUSPEND 02 suspends a port resumes a port

PORT_OVERCURRENT 03 not used not used

PORT_RESET 04 resets and enables a

port not used

PORT_POWER 08 powers on a port powers off a port

PORT_LOW_SPEED 09 not used not used

C_PORT_CONNECTION 10 not used clears port connection

change bit

C_PORT_ENABLE 11 not used clears port enable

change bit

C_PORT_SUSPEND 12 not used clears port suspend

change bit

C_PORT_OVERCURRENT 13 not used clears port overcurrent

change bit

C_PORT_RESET 14 not used clears port reset

change bit

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 15 of 48

9.3 Descriptors

The ISP1122A hub controller supports the following standard USB descriptors:

•Device

•Conﬁguration

•Interface

•Endpoint

•Hub

•String.

Table 10: Device descriptor

Values in square brackets are optional.

Offset

(bytes) Field name Size

(bytes) Value

(Hex) Comments

0 bLength 1 12 descriptor length = 18 bytes

1 bDescriptorType 1 01 type = DEVICE

2 bcdUSB 2 10, 01

USB Speciﬁcation Rev. 1.1

4 bDeviceClass 1 09 HUB_CLASSCODE

5 bDeviceSubClass 1 00 -

6 bDeviceProtocol 1 00 -

7 bMaxPacketSize0 1 40 packet size = 64 bytes

8 idVendor 2 CC, 04 Philips Semiconductors vendor ID

(04CC); can be customized using an

external EEPROM (see Table 23)

10 idProduct 2 22, 11 ISP1122A product ID; can be

customized using an external

EEPROM (see Table 23)

12 bcdDevice 2 01, 01 device release 1.1; silicon revision

increments this value

14 iManufacturer 1 00 no manufacturer string (default)

[01] manufacturer string enabled

(using an external EEPROM)

15 iProduct 1 00 no product string (default)

[02] product string enabled

(using an external EEPROM)

16 iSerialNumber 1 00 no serial number string

17 bNumConﬁgurations 1 01 one conﬁguration

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 16 of 48

[1] Selected by input SP/BP.

[2] Value in units of 2 mA.

Table 11: Conﬁguration descriptor

Values in square brackets are optional.

Offset

(bytes) Field name Size

(bytes) Value

(Hex) Comments

0 bLength 1 09 descriptor length=9bytes

1 bDescriptorType 1 02 type = CONFIGURATION

2 wTotalLength 2 19, 00 total length of conﬁguration, interface

and endpoint descriptors (25 bytes)

4 bNumInterfaces 1 01 one interface

5 bConﬁgurationValue 1 01 conﬁguration value = 1

6 iConﬁguration 1 00 no conﬁguration string

7 bmAttributes 1 E0 self-powered with remote wake-up[1]

A0 bus-powered with remote wake-up[1]

8 MaxPower[2] 1 32 100 mA (default)

[00] 0 mA (using an external EEPROM)

[FA] 500 mA (using an external EEPROM)

Table 12: Interface descriptor

Offset

(bytes) Field name Size

(bytes) Value

(Hex) Comments

0 bLength 1 09 descriptor length=9bytes

1 bDescriptorType 1 04 type = INTERFACE

2 bInterfaceNumber 1 00 -

3 bAlternateSetting 1 01 no alternate setting

4 bNumEndpoints 1 01 status change (interrupt) endpoint

5 bInterfaceClass 1 09 HUB_CLASSCODE

6 bInterfaceSubClass 1 00 -

7 bInterfaceProtocol 1 00 no class-speciﬁc protocol

8 bInterface 1 00 no interface string

Table 13: Endpoint descriptor

Offset

(bytes) Field name Size

(bytes) Value

(Hex) Comments

0 bLength 1 07 descriptor length=7bytes

1 bDescriptorType 1 05 type = ENDPOINT

2 bEndpointAddress 1 81 endpoint 1, direction: IN

3 bmAttributes 1 03 interrupt endpoint

4 wMaxPacketSize 2 01, 00 packet size = 1 byte

6 bInterval 1 FF polling interval (255 ms)

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 17 of 48

[1] ISP1122A always reports power management status on an individual basis, even for ganged/global

modes. This is compliant with

USB Speciﬁcation Rev. 1.1

[2] Condition with no overcurrent detection is reported to the host.

[3] Value in units of 2 ms.

[1] Unicode encoded string.

Table 14: Hub descriptor

Values in square brackets are optional.

Offset

(bytes) Field name Size

(bytes) Value

(Hex) Comments

0 bDescLength 1 09 descriptor length=9bytes

1 bDescriptorType 1 29 type = HUB

2 bNbrPorts 1 05 to 02 number of enabled downstream ports;

selectable by DP/DM strapping

3 wHubCharacteristics 2 09, 00 individual power switching[1],

overcurrent protection active

(modes 0, 1, 3, 4, 5, 7)

11, 00 individual power switching[1], no

overcurrent protection (modes 2, 6)[2]

5 bPwrOn2PwrGood[3] 1 32 100 ms (default; modes 0, 1, 2, 4, 5, 6)

00 0 ms (default; modes 3, 7)

[FA] 500 ms (using an external EEPROM;

modes 0, 1, 2, 4, 5, 6); see Table 23

6 bHubContrCurrent 1 64 maximum hub controller current

(100 mA)

7 DeviceRemovable 1 00 all devices removable

8 PortPwrCtrlMask 1 FF must be all ones for compatibility with

USB Speciﬁcation Rev. 1.0

Table 15: String descriptors

String descriptors are optional and therefore disabled by default; they can be enabled through

an external EEPROM.

Offset

(bytes) Field name Size

(bytes) Value

(Hex) Comments

String descriptor (0): language ID string

0 bLength 1 04 descriptor length=4bytes

1 bDescriptorType 1 03 type = STRING

2 bString 2 09, 04 LANGID code zero

String descriptor (1): manufacturer string

0 bLength 1 2E descriptor length = 46 bytes

1 bDescriptorType 1 03 type = STRING

2 bString 44 UC[1] “Philips Semiconductors”

String descriptor (2): product string

0 bLength 1 10 descriptor length = 16 bytes

1 bDescriptorType 1 03 type = STRING

2 bString 14 UC[1] “ISP1122”

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 18 of 48

9.4 Hub responses

This section describes the hub responses to requests from the USB host.

9.4.1 Get device status

The hub returns 2 bytes, see Table 16.

9.4.2 Get conﬁguration

The hub returns 1 byte, see Table 17.

9.4.3 Get interface status

The hub returns 2 bytes, see Table 18.

9.4.4 Get hub status

The hub returns 4 bytes, see Table 19.

Table 16: Get device status response

Bit # Function Value Description

0 self-powered 0 bus-powered

1 self-powered

1 remote wake-up 0 no remote wake-up

1 remote wake-up enabled

2 to 15 reserved 0 -

Table 17: Get conﬁguration response

Bit # Function Value Description

0 conﬁguration value 0 device not conﬁgured

1 device conﬁgured

1 to 7 reserved 0 -

Table 18: Get interface status response

Bit # Function Value Description

0 to 15 reserved 0 -

Table 19: Get hub status response

Bit # Function Value Description

0 local power source 0 local power supply good

1 local power supply lost

1 overcurrent indicator 0 no overcurrent condition

1 hub overcurrent condition detected

2 to 15 reserved 0 -

16 local power status change 0 no change in local power status

1 local power status changed

17 overcurrent indicator change 0 no change in overcurrent condition

1 overcurrent condition changed

18 to 31 reserved 0 -

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 19 of 48

9.4.5 Get port status

The hub returns 4 bytes. The ﬁrst 2 bytes contain the port status bits (wPortStatus,

see Table 20). The last 2 bytes hold the port status change bits (wPortChange, see

Table 21).

Table 20: Get port status response (wPortStatus)

Bit # Function Value Description

0 current connect status 0 no device present

1 device present on this port

1 port enabled/disabled 0 port disabled

1 port enabled

2 suspend 0 port not suspended

1 port suspended

3 overcurrent indicator 0 no overcurrent condition

1 overcurrent condition detected

4 reset 0 reset not asserted

1 reset asserted

5 to 7 reserved 0 -

8 port power 0 port powered off

1 port power on

9 low-speed device attached 0 full-speed device attached

1 low-speed device attached

10 to 15 reserved 0 -

Table 21: Get port status response (wPortChange)

Bit # Function Value Description

0 connect status change 0 no change in current connect status

1 current connect status changed

1 port enabled/disabled

change 0 no port error

1 port disabled by a port error

2 suspend change 0 no change in suspend status

1 resume complete

3 overcurrent indicator change 0 no change in overcurrent status

1 overcurrent indicator changed

4 reset change 0 no change in reset status

1 reset complete

5 to 15 reserved 0 -

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 20 of 48

9.4.6 Get conﬁguration descriptor

The hub returns 25 bytes containing the conﬁguration descriptor (9 bytes, see

Table 11), the interface descriptor (9 bytes, see Table 12) and the endpoint descriptor

(7 bytes, see Table 13).

9.4.7 Get device descriptor

The hub returns 18 bytes containing the device descriptor, see Table 10.

9.4.8 Get hub descriptor

The hub returns 9 bytes containing the hub descriptor, see Table 14.

9.4.9 Get string descriptor (0)

The hub returns 4 bytes containing the language ID, see Table 15.

9.4.10 Get string descriptor (1)

The hub returns 46 bytes containing the manufacturer name, see Table 15.

9.4.11 Get string descriptor (2)

The hub returns 16 bytes containing the product name, see Table 15.

10. I2C-bus interface

A simple I2C-bus interface is provided in the ISP1122A to read customized vendor ID,

product ID and some other conﬁguration bits from an external EEPROM. The

interface supports single master operation at a nominal bus speed of 93.75 kHz.

The I2C-bus interface is intended for bidirectional communication between ICs via two

serial bus wires, SDA (data) and SCL (clock). Both lines are driven by open-drain

circuits and must be connected to the positive supply voltage via pull-up resistors.

10.1 Protocol

The I2C-bus protocol deﬁnes the following conditions:

•Bus free: both SDA and SCL are HIGH

•START: a HIGH-to-LOW transition on SDA, while SCL is HIGH

•STOP: a LOW-to-HIGH transition on SDA, while SCL is HIGH

•Data valid: after a START condition, data on SDA are stable during the HIGH

period of SCL; data on SDA may only change while SCL is LOW.

Each device on the I2C-bus has a unique slave address, which the master uses to

select a device for access.

The master starts a data transfer using a START condition and ends it by generating

a STOP condition. Transfers can only be initiated when the bus is free. The receiver

must acknowledge each byte by means of a LOW level on SDA during the ninth clock

pulse on SCL.

For detailed information please consult

The I

C-bus and how to use it

., order number

9398 393 40011.

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 21 of 48

10.2 Hardware connections

Via the I2C-bus interface the ISP1122A can be connected to an external EEPROM

(PCF8582 or equivalent). The hardware connections are shown in Figure 5.

The SCL and SDA pins are multiplexed with pins OPTION and INDV respectively.

The slave address which ISP1122A uses to access the EEPROM is 1010000B. Page

mode addressing is not supported, so pins A0, A1 and A2 of the EEPROM must be

connected to GND (logic 0).

10.3 Data transfer

When the ISP1122A is reset, the I2C-bus interface tries to read 6 bytes of

conﬁguration data from an external EEPROM. If no response is detected, the levels

on inputs SDA and SCL are interpreted as INDV and OPTION to select the operating

mode (see Table 4).

The data in the EEPROM memory are organized as shown in Table 22.

[1] Vendor ID code in the Device descriptor, see Table 10.

[2] Product ID code in the Device descriptor, see Table 10.

Fig 5. EEPROM connection diagram.

dth

MBL166

INDV/SDA

OPTION/SCL

SDA

SCL

VDD

ISP1122A

USB HUB

PCF8582

EEPROM

equivalent

I2C-bus

Table 22: EEPROM organization

Address

(Hex) Default value

(Hex) Contents

00 CC idVendor[1] (lower byte)

01 04 idVendor[1] (upper byte)

02 22 idProduct[2] (lower byte)

03 11 idProduct[2] (upper byte)

04 - conﬁguration bits C7 to C0; see Table 23

05 AA signature

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 22 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
[1] Default value at reset if no external EEPROM is present.
[2] Modiﬁes the Hub Descriptor ﬁeld ‘bPwrOn2PwrGood’, see Table 14.
[3] Modiﬁes the Hub Descriptor ﬁeld ‘MaxPower’, see Table 14.
11. Hub power modes
USB hubs can either be self-powered or bus-powered.
Self-powered — Self-powered hubs have a 5 V local power supply on board which
provide power to the hub and the downstream ports. The
USB Speciﬁcation Rev. 1.1
requires that these hubs limit the current to 500 mA per downstream port and report
overcurrent conditions to the host. The hub may optionally draw 100 mA from the
USB supply (VBUS) to power the interface functions (hybrid-powered).
Bus-powered — Bus-powered hubs obtain all power from the host or an upstream
self-powered hub. The maximum current is 100 mA per downstream port. Current
limiting and reporting of overcurrent conditions are both optional.
Power switching of downstream ports can be done individually or ganged, where all
ports are switched simultaneously with one power switch. The ISP1122A supports
both modes, which can be selected using input INDV (see Table 4).
11.1 Voltage drop requirements
11.1.1 Self-powered hubs
Self-powered hubs are required to provide a minimum of 4.75 V to its output port
connectors at all legal load conditions. To comply with Underwriters Laboratory Inc.
(UL) safety requirements, the power from any port must be limited to 25 W (5 A at
5 V). Overcurrent protection may be implemented on a global or individual basis.
Table 23: Conﬁguration bits
Bit Function Value
(Bin) Description
C0 OPTION see Table 4 “Mode selection”
C1 INDV see Table 4 “Mode selection”
C2 reserved 0[1] must always be programmed to logic 0
C3 PwrOn2PwrGood[2] 0[1] 100 ms (bPwrOn2PwrGood = 32H)
1 500 ms (bPwrOn2PwrGood = FAH)
C4 string descriptor enable 0[1] string descriptors disabled
1 string descriptors enabled (strings:
“Philips Semiconductors”, “ISP1122A”)
C5 internal analog overcurrent
detection enable 0 internal analog overcurrent detection
circuit disabled; overcurrent pins OCn
function as digital inputs (TTL level)
1[1] internal analog overcurrent detection
circuit enabled
C7, C6 MaxPower[3] 00[1] 100 mA (MaxPower = 32H)
1X 500 mA (MaxPower = FAH)
01 0 mA (MaxPower = 00H)

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 23 of 48

Assuming a 5 V ±3% power supply the worst case supply voltage is 4.85 V. This only

allows a voltage drop of 100 mV across the hub printed-circuit board (PCB) to each

downstream connector. This includes a voltage drop across:

•Power supply connector

•Hub PCB (power and ground traces, ferrite beads)

•Power switch (FET on-resistance)

•Overcurrent sense device.

PCB resistance and power supply connector resistance may cause a drop of 25 mV,

leaving only 75 mV as the voltage drop allowed across the power switch and

overcurrent sense device. The individual voltage drop components are shown in

Figure 6.

In case of global overcurrent detection an increased voltage drop is needed for the

overcurrent sense device (in this case a low-ohmic resistor). This can be realized by

using a special power supply of 5.1 V ±3%, as shown in Figure 7.

11.1.2 Bus-powered hubs

Bus-powered hubs are guaranteed to receive a supply voltage of 4.5 V at the

upstream port connector and must provide a minimum of 4.4 V to the downstream

port connectors. The voltage drop of 100 mV across bus-powered hubs includes:

•Hub PCB (power and ground traces, ferrite beads)

•Power switch (FET on-resistance)

•Overcurrent sense device.

(1) Includes PCB traces, ferrite beads, etc.

Fig 6. Typical voltage drop components in self-powered mode using individual overcurrent detection.

handbook, full pagewidth

5 V

POWER SUPPLY

± 3% regulated −

+4.85 V(min)

MGR781

low-ohmic

PMOS switch

ISP1122

power

switch

VBUS

D+

D−

GND

SHIELD

4.75 V(min)

downstream

port

connector

hub board

resistance

voltage drop

25 mV

voltage drop

75 mV

(1)

(1) Includes PCB traces, ferrite beads, etc.

Fig 7. Typical voltage drop components in self-powered mode using global overcurrent detection.

handbook, full pagewidth

5.1 V KICK-UP

POWER SUPPLY

± 3% regulated −

+4.95 V(min)

MGR782

low-ohmic

PMOS switch

ISP1122

power

switch

VBUS

D+

D−

GND

SHIELD

4.75 V(min)

downstream

port

connector

hub board

resistance

voltage drop

25 mV

voltage drop

75 mV

low-ohmic

sense resistor

for overcurrent

detection

voltage drop

100 mV

(1)

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 24 of 48

The PCB resistance may cause a drop of 25 mV, which leaves 75 mV for the power

switch and overcurrent sense device. The voltage drop components are shown in

Figure 8.

For bus-powered hubs overcurrent protection is optional. It may be implemented for

all downstream ports on a global or individual basis.

12. Overcurrent detection

The ISP1122A has an analog overcurrent detection circuit for monitoring downstream

port lines. This circuit automatically reports an overcurrent condition to the host and

turns off the power to the faulty port. The host must reset the condition ﬂag.

Pins OC1 to OC5/GOC are used for individual port overcurrent detection. Pin

OC5/GOC can also be used for global overcurrent detection. This is controlled by

input INDV (see Table 4).

The overcurrent detection circuit can be switched off using an external EEPROM (see

Table 23). In this case, the overcurrent pins OCn function as logic inputs (TTL level).

12.1 Overcurrent circuit description

The integrated overcurrent detection circuit of ISP1122A senses the voltage drop

across the power switch or an extra low-ohmic sense resistor. When the port draws

too much current, the voltage drop across the power switch exceeds the trip voltage

threshold (∆Vtrip). The overcurrent circuit detects this and switches off the power

switch control signal after a delay of 15 ms (ttrip). This delay acts as a ‘debounce’

period to minimize false tripping, especially during the inrush current produced by ‘hot

plugging’ of a USB device.

12.2 Power switch selection

From the voltage drop analysis given in Figure 6,Figure 7 and Figure 8, the power

switch has a voltage drop budget of 75 mV. For individual self-powered mode, the

current drawn per port can be up to 500 mA. Thus the power switch should have

maximum on-resistance of 150 mΩ.

If the voltage drop due to the hub board resistance can be minimized, the power

switch can have more voltage drop budget and therefore a higher on-resistance.

Power switches with a typical on-resistance of around 100 mΩﬁt into this application.

(1) Includes PCB traces, ferrite beads, etc.

Fig 8. Typical voltage drop components in bus-powered mode (no overcurrent detection).

handbook, full pagewidth

MGR783

low-ohmic

PMOS switch

ISP1122

power

switch

VBUS

D+

D−

GND

SHIELD

VBUS

D+

D−

GND

SHIELD

4.40 V(min)4.50 V(min)

downstream

port

connector

upstream

port

connector

hub board

resistance

voltage drop

25 mV

voltage drop

75 mV

(1)

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 25 of 48

The ISP1122A overcurrent detection circuit has been designed with a nominal trip

voltage (∆Vtrip) of 85 mV. This gives a typical trip current of approximately 850 mA for

a power switch with an on-resistance of 100 mΩ1.

12.3 Tuning the overcurrent trip voltage

The ISP1122A trip voltage can optionally be adjusted through external components

to set the desired trip current. This is done by inserting tuning resistors at pins SP/BP

or OCn (see Figure 9). Rtu tunes up the trip voltage ∆Vtrip and Rtd tunes it down

according to Equation 1.

(1)

with Iref(nom) =5µA and IOC(nom) = 0.5 µA.

12.4 Reference circuits

Some typical examples of port power switching and overcurrent detection modes are

given in Figure 10 to Figure 13.

The RC circuit (47 kΩand 0.1 µF) around the PMOS switch provides for soft turn-on.

The series resistor connecting the SP/BP pin to VCC tunes up the overcurrent trip

voltage slightly (see Figure 9). In the schematic diagram the resistor separates the

net names for pins VCC and SP/BP. This allows an automatic router to use a wide

trace for VCC and a narrow trace to connect pin SP/BP.

1. The following PMOS power switches have been tested to work well with the ISP1122A: Philips PHP109, Vishay Siliconix Si2301DS,

Fairchild FDN338P.

∆Vtrip ∆Vtrip intrinsic()

ref Rtu

⋅IOC Rtd

⋅–+=

Iref(nom) =5µA

OC(nom) = 0.5 µAIOC(nom) = 0.5 µA

a. Self-powered mode. b. Bus-powered mode.

Fig 9. Tuning the overcurrent trip voltage.

handbook, halfpage

MBL167

VCC Iref

Rtu Rtd

low-ohmic

PMOS switch

VCC SP/BP

ISP1122A

OCn

IOC

handbook, halfpage

MBL168

VBUS

Rtd

low-ohmic

PMOS switch

VCC SP/BP

ISP1122A

OCn

IOC

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 26 of 48

Power switches 1 to 5 are low-ohmic PMOS devices as speciﬁed in Section 12.2.

Fig 10. Mode 5: self-powered hub; individual port power switching; individual overcurrent detection.

MBL170

handbook, full pagewidth

INDV

OPTION

PSW1/GL1

PSW5/GL5/GPSW

PSW4/GL4

PSW3/GL3

SP/BP

OC5/GOC

PSW2/GL2

OC1

OC2

OC3

OC4

5 V

POWER SUPPLY

± 3% 1

−

+VBUS

D+

D−

GND

SHIELD

+4.85 V(min)

+4.75 V

(min) 1

2VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 2

3VBUS

D+

D−

GND

SHIELD

+4.75 V

(min)

VCC

GND

330 kΩ

(5×)

100 Ω

1 kΩ

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 4

120

µF

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 5

ferrite bead

downstream

ports

ISP1122A

120

µF

ferrite bead

120

µF

ferrite bead

120

µF

ferrite bead

120

µF

ferrite bead

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 27 of 48

Power switch is low-ohmic PMOS device as speciﬁed in Section 12.2.

Fig 11. Mode 1: self-powered hub; ganged port power switching; global overcurrent detection.

handbook, full pagewidth

MBL171

INDV

OPTION

PSW1/GL1

PSW5/GL5/GPSW

PSW4/GL4

PSW3/GL3

SP/BP

OC5/GOC

PSW2/GL2

OC1

OC2

OC3

OC4

low-ohmic

sense resistor

for overcurrent

detection

ISP1122A

5.1 V KICK-UP

POWER SUPPLY

± 3% −

++4.95 V(min)

+4.95 V(min) VCC

GND

330

kΩ

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 1

downstream

ports

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 2

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 3

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 4

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.75 V

(min) 5

120

µF

ferrite bead

100 Ω

1 kΩ

low-ohmic

PMOS switch

47 kΩ

0.1 µF

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 28 of 48

Power switches 1 to 4 are low-ohmic PMOS devices as speciﬁed in Section 12.2.

Fig 12. Mode 4: bus-powered hub; individual port power switching; individual overcurrent detection.

handbook, full pagewidth

MBL172

INDV

OPTION

PSW1/GL1

PSW5/GL5/GPSW

PSW4/GL4

PSW3/GL3

SP/BP

OC5/GOC

PSW2/GL2

OC1

OC2

OC3

OC4

ISP1122A

VBUS

D+

D−

GND

SHIELD

+4.50 V(min)

upstream

port

VCC

GND

+4.40 V

(min)

VBUS

D+

D−

GND

SHIELD

downstream

ports

120

µF

ferrite bead

+4.40 V

(min)

VBUS

D+

D−

GND

SHIELD

120

µF

ferrite bead

+4.40 V

(min)

VBUS

D+

D−

GND

SHIELD

120

µF

ferrite bead

+4.40 V

(min)

VBUS

D+

D−

GND

SHIELD

120

µF

ferrite bead

330 kΩ

(4×)

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

low-ohmic

PMOS switch

47 kΩ

0.1 µF

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 29 of 48

Power switch is low-ohmic PMOS device as speciﬁed in Section 12.2.

Fig 13. Mode 0: bus-powered hub; ganged port power switching; global overcurrent detection.

MBL173

handbook, full pagewidth

INDV

OPTION

PSW1/GL1

PSW5/GL5/GPSW

PSW4/GL4

PSW3/GL3

SP/BP

OC5/GOC

PSW2/GL2

OC1

OC2

OC3

OC4

ISP1122A

VBUS

D+

D−

GND

SHIELD

+4.50 V(min)

upstream

port

VCC

GND

330

kΩ

VBUS

D+

D−

GND

SHIELD

+4.40 V

(min) 1

downstream

ports

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.40 V

(min) 2

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.40 V

(min) 3

120

µF

ferrite bead

VBUS

D+

D−

GND

SHIELD

+4.40 V

(min) 4

120

µF

ferrite bead

low-ohmic

PMOS switch

47 kΩ

0.1 µF

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 30 of 48

13. Limiting values

[1] Equivalent to discharging a 100 pF capacitor via a 1.5 kΩ resistor (Human Body Model).

[2] Values are given for device only; in-circuit Vesd(max) =±8000 V.

[3] For open-drain pins Vesd(max) =±2000 V.

Table 24: Absolute maximum ratings

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter Conditions Min Max Unit

VCC supply voltage −0.5 +6.0 V

VIinput voltage −0.5 VCC + 0.5 V

Ilatchup latchup current VI< 0 or VI>V

CC - 200 mA

Vesd electrostatic discharge voltage ILI <15µA[1] [2] -±4000[3] V

Tstg storage temperature −60 +150 °C

Ptot total power dissipation - 95 mW

Table 25: Recommended operating conditions

Symbol Parameter Conditions Min Max Unit

VCC supply voltage 4.0 5.5 V

VIinput voltage 0 5.5 V

VI(AI/O) input voltage on analog I/O pins

(D+/D−)0 3.6 V

VO(od) open-drain output pull-up voltage 0 5.5 V

Tamb operating ambient temperature −40 +85 °C

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 31 of 48

14. Static characteristics

[1] In ‘suspend’ mode the minimum voltage is 2.7 V.

[1] Bus-powered mode.

[2] Self-powered or hybrid-powered mode.

Table 26: Static characteristics; supply pins

= 4.0 to 5.5 V; V

GND

=0V; T

amb

−

40 to

C; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Vreg(3.3) regulated supply voltage 3.0[1] 3.3 3.6 V

ICC operating supply current - 18 - mA

ICC(susp) suspend supply current 1.5 kΩ pull-up on upstream

port D+ (pin DP0) - - 270 µA

no pull-up on upstream port

D+ (pin DP0) --80µA

Table 27: Static characteristics: digital pins

= 4.0 to 5.5 V; V

GND

=0V; T

amb

−

40 to

C; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Input levels

VIL LOW-level input voltage - - 0.8 V

VIH HIGH-level input voltage 2.0 - - V

Schmitt trigger inputs

Vth(LH) positive-going threshold

voltage 1.4 - 1.9 V

Vth(HL) negative-going threshold

voltage 0.9 - 1.5 V

Vhys hysteresis voltage 0.4 - 0.7 V

Output levels

VOL LOW-level output voltage

(open drain outputs) IOL = 6 mA - - 0.4 V

IOL =20µA - - 0.1 V

Leakage current

ILI input leakage current - - ±1µA

Open-drain outputs

IOZ OFF-state output current - - ±1µA

Table 28: Static characteristics: overcurrent sense pins

= 4.0 to 5.5 V; V

GND

=0V; T

amb

−

40 to

C; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

∆Vtrip overcurrent detection

trip voltage on OCn pins ∆V=V

CC −VOCn [1] 65 85 105 mV

∆V=V

SP/BP −VOCn [2]

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 32 of 48

[1] D+ is the USB positive data pin (DPn); D− is the USB negative data pin (DMn).

[2] Includes external resistors of 20 Ω±1% on both D+ and D−.

[3] This voltage is available at pin Vreg(3.3).

[4] In ‘suspend’ mode the minimum voltage is 2.7 V.

15. Dynamic characteristics

[1] Dependent on the crystal oscillator start-up time.

Table 29: Static characteristics: analog I/O pins (D+, D−)[1]

= 4.0 to 5.5 V; V

GND

=0V; T

amb

−

40 to

C; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Input levels

VDI differential input sensitivity |VI(D+)−VI(D−)|0.2 - - V

VCM differential common mode

voltage includes VDI range 0.8 - 2.5 V

VIL LOW-level input voltage - - 0.8 V

VIH HIGH-level input voltage 2.0 - - V

Output levels

VOL LOW-level output voltage RL= 1.5 kΩ to +3.6V - - 0.3 V

VOH HIGH-level output voltage RL=15kΩ to GND 2.8 - 3.6 V

Leakage current

ILZ OFF-state leakage current - - ±10 µA

Capacitance

CIN transceiver capacitance pin to GND - - 20 pF

Resistance

ZDRV [2] driver output impedance steady-state drive 28 - 44 Ω

ZINP input impedance 10 - - MΩ

Termination

VTERM [3] termination voltage for

upstream port pull-up (RPU)3.0[4] - 3.6 V

Table 30: Dynamic characteristics

= 4.0 to 5.5 V; V

GND

=0V; T

amb

−

40 to

C; unless otherwise speciﬁed.

Symbol Parameter Conditions Min Typ Max Unit

Reset

tW(RESET) pulse width on input RESET crystal oscillator running 10 - - µs

crystal oscillator stopped - 2[1] -ms

Crystal oscillator

fXTAL crystal frequency - 6 - MHz

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 33 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
[1] Operating modes 0, 1, 4 and 5; see Table 4.
[1] Test circuit: see Figure 22.
[2] Excluding the ﬁrst transition from Idle state.
[3] Characterized only, not tested. Limits guaranteed by design.
Table 31: Dynamic characteristics: overcurrent sense pins
V
CC
= 4.0 to 5.5 V; V
GND
=0V; T
amb
=
−
40 to
+
85
°
C; unless otherwise speciﬁed.
Symbol Parameter Conditions Min Typ Max Unit
ttrip overcurrent trip response time
from OCn LOW to PSWn HIGH see Figure 14 [1] --15ms
Table 32: Dynamic characteristics: analog I/O pins (D+, D−); full-speed mode[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V;T
amb
=
−
40 to
+
85
°
C; C
L
= 50 pF; R
PU
= 1.5 k
Ω
on D
+
to V
TERM
.; unless otherwise speciﬁed.
Symbol Parameter Conditions Min Typ Max Unit
Driver characteristics
tFR rise time CL=50pF;
10 to 90% of |VOH −VOL|4 - 20 ns
tFF fall time CL=50pF;
10 to 90% of |VOH −VOL|4 - 20 ns
FRFM differential rise/fall time
matching (tFR/tFF)[2] 90 - 111.11 %
VCRS output signal crossover voltage [2] [3] 1.3 - 2.0 V
Data source timing
tDJ1 source differential jitter for
consecutive transitions see Figure 15 [2] [3] −3.5 - +3.5 ns
tDJ2 source differential jitter for
paired transitions see Figure 15 [2] [3] −4- +4ns
t
FEOPT source EOP width see Figure 16 [3] 160 - 175 ns
tFDEOP source differential data-to-EOP
transition skew see Figure 16 [3] −2- +5ns
Receiver timing
tJR1 receiver data jitter tolerance for
consecutive transitions see Figure 17 [3] −18.5 - +18.5 ns
tJR2 receiver data jitter tolerance for
paired transitions see Figure 17 [3] −9- +9ns
t
FEOPR receiver SE0 width accepted as EOP;
see Figure 16 [3] 82--ns
t
FST width of SE0 during differential
transition rejected as EOP;
see Figure 18 [3] --14ns
Hub timing (downstream ports conﬁgured as full-speed)
tFHDD hub differential data delay
(without cable) see Figure 19;
CL=0pF [3] --44ns
t
FSOP data bit width distortion after
SOP see Figure 19 [3] −5- +5ns
t
FEOPD hub EOP delay relative to tHDD see Figure 20 [3] 0 - 15 ns
tFHESK hub EOP output width skew see Figure 20 [3] −15 - +15 ns

Philips Semiconductors ISP1122A
USB stand-alone hub
Preliminary speciﬁcation Rev. 01 — 27 March 2000 34 of 48
9397 750 06986 © Philips Electronics N.V. 2000. All rights reserved.
[1] Test circuit: see Figure 22.
[2] Excluding the ﬁrst transition from Idle state.
[3] Characterized only, not tested. Limits guaranteed by design.
Table 33: Dynamic characteristics: analog I/O pins (D+, D−); low-speed mode[1]
V
CC
= 4.0 to 5.5 V; V
GND
=0V;T
amb
=
−
40 to
+
85
°
C; C
L
= 50 pF; R
PU
= 1.5 k
Ω
on D
−
to V
TERM
; unless otherwise speciﬁed.
Symbol Parameter Conditions Min Typ Max Unit
Driver characteristics
tLR rise time CL= 200 to 600 pF;
10 to 90% of |VOH −VOL|75 - 300 ns
tLF fall time CL= 200 to 600 pF;
10 to 90% of |VOH −VOL|75 - 300 ns
LRFM differential rise/fall time
matching (tLR/tLF)[2] 80 - 125 %
VCRS output signal crossover voltage [2] [3] 1.3 - 2.0 V
Hub timing (downstream ports conﬁgured as low-speed)
tLHDD hub differential data delay see Figure 19 - - 300 ns
tLSOP data bit width distortion after
SOP see Figure 19 [3] −60 - +60 ns
tLEOPD hub EOP delay relative to tHDD see Figure 20 [3] 0 - 200 ns
tLHESK hub EOP output width skew see Figure 20 [3] −300 - +300 ns
Overcurrent input: OCn; power switch output: PSWn.
Reference voltage for overcurrent sensing: VCC (bus-powered mode) or VSP/BP (self-powered mode).
Fig 14. Overcurrent trip response timing.
handbook, halfpage
MBL032
VCC
0 V
overcurrent
input
VCC
0 V
power switch
output
ttrip
∆Vtrip

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 35 of 48

TPERIOD is the bit duration corresponding with the USB data rate.

Fig 15. Source differential data jitter.

handbook, full pagewidth

MGR870

TPERIOD

differential

data lines

crossover point crossover point crossover point

consecutive

transitions

N × TPERIOD + tDJ1 paired

transitions

N × TPERIOD + tDJ2

+3.3 V

0 V

TPERIOD is the bit duration corresponding with the USB data rate.

Full-speed timing symbols have a subscript preﬁx ‘F’, low-speed timings a preﬁx ‘L’.

Fig 16. Source differential data-to-EOP transition skew and EOP width.

andbook, full pagewidth

MGR776

TPERIOD

differential

data lines

crossover point

differential data to

SE0/ EOP skew

N × TPERIOD + tDEOP

source EOP width: tEOPT

receiver EOP width: tEOPR

crossover point

extended

+3.3 V

0 V

TPERIOD is the bit duration corresponding with the USB data rate.

Fig 17. Receiver differential data jitter.

handbook, full pagewidth

MGR871

TPERIOD

tJR

differential

data lines

consecutive

transitions

N × TPERIOD + tJR1 paired

transitions

N × TPERIOD + tJR2

+3.3 V

0 V tJR1 tJR2

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 36 of 48

Fig 18. Receiver SE0 width tolerance.

handbook, halfpage

MGR872

differential

data lines

+3.3 V

0 V

tFST

VIH(min)

Full-speed timing symbols have a subscript preﬁx ‘F’, low-speed timings a preﬁx ‘L’.

Fig 19. Hub differential data delay and SOP distortion.

andbook, full pagewidth

MGR777

SOP distortion:

tSOP = tHDD (next J) − tHDD(SOP)

(A) downstream hub delay (B) upstream hub delay

upstream

differential

data lines

hub delay

downstream

tHDD

hub delay

upstream

tHDD

downstream

differential

data lines

downstream

differential

data

upstream

differential

data

crossover

point crossover

point

crossover

point

crossover

point

+3.3 V

0 V

+3.3 V

0 V

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 37 of 48

[1] fSCL =1⁄64fXTAL.

[2] Rise time is determined by Cb and pull-up resistor value Rp (typ. 4.7 kΩ).

Full-speed timing symbols have a subscript preﬁx ‘F’, low-speed timings a preﬁx ‘L’.

Fig 20. Hub EOP delay and EOP skew.

andbook, full pagewidth

MGR778

tEOP+

tEOP−tEOP+

tEOP−

crossover

point

extended

crossover

point

extended

EOP delay:

tEOP = max (tEOP−, tEOP+)

EOP delay relative to t HDD:

tEOPD = tEOP − tHDD

EOP skew:

tHESK = tEOP+ − tEOP−

(A) downstream EOP delay (B) upstream EOP delay

upstream

differential

data lines downstream

port

crossover

point

extended

crossover

point

extended

upstream

end of cable

downstream

differential

data lines

+3.3 V

0 V

+3.3 V

0 V

Table 34: Dynamic characteristics: I2C-bus pins (SDA, SCL)

and T

amb

within recommended operating range; V

+5 V; V

GND

; V

and V

between V

and V

Symbol Parameter Conditions Min Typ Max Unit

fSCL SCL clock frequency fXTAL = 6 MHz 0 93.75[1] 100 kHz

tBUF bus free time 4.7 - - µs

tSU;STA START condition set-up time 250 - - ns

tHD;STA hold time START condition 4.0 - - µs

tLOW SCL LOW time 4.7 - - µs

tHIGH SCL HIGH time 4.0 - - µs

trSCL and SDA rise time [2] - - 1000 ns

tfSCL and SDA fall time - - 300 ns

tSU;DAT data set-up time 250 - - ns

tHD;DAT data hold time 0 - - µs

tVD;DAT SCL LOW to data out valid

time - - 0.4 µs

tSU;STO STOP condition set-up time 4.0 - - µs

Cbcapacitive load for each bus

line - - 400 pF

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 38 of 48

16. Test information

The dynamic characteristics of the analog I/O ports (D+and D−) as listed in Table 32

and Table 33, were determined using the circuit shown in Figure 22.

Fig 21. I2C-bus timing.

andbook, full pagewidth

PS S P

MGR779

tHD;STA

tBUF tHD;STA

tSU;STA

tSU;DAT

tHIGH tSU;STO

tHD;STA

tLOW

SDA

SCL

Load capacitance:

CL= 50 pF (full-speed mode)

CL= 200 pF or 600 pF (low-speed mode, minimum or maximum timing).

Speed selection:

full-speed mode (FS): 1.5 kΩ pull-up resistor on D+

low-speed mode (LS): 1.5 kΩ pull-up resistor on D−.

Fig 22. Load impedance for D+ and D- pins.

MGR775

handbook, halfpage

test point

test

closed

open

D−/LS

D+/LS

D−/FS

D+/FS

Vreg(3.3)

15 kΩ

RPU

1.5 kΩ

20 Ω

D.U.T.

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 39 of 48

17. Package outline

Fig 23. SO32 package outline.

UNIT A

max. A1A2A3bpcD

(1) E(1) eH

ELL

pQZywv θ

REFERENCES

OUTLINE

VERSION EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC EIAJ

inches

2.65

0.10

0.25

0.01

1.4

0.055

0.3

0.1 2.45

2.25 0.49

0.36 0.27

0.18 20.7

20.3 7.6

7.4 1.27 10.65

10.00 1.2

1.0 0.95

0.55 8

0.25 0.1

0.004

0.25

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

1.1

0.4

SOT287-1 MO-119

(1)

0.012

0.004 0.096

0.086 0.02

0.01 0.050 0.047

0.039

0.419

0.394

0.30

0.29

0.81

0.80

0.011

0.007 0.037

0.022

0.010.01

0.043

0.016

vMA

32 17

detail X

(A )

pin 1 index

0 5 10 mm

scale

SO32: plastic small outline package; 32 leads; body width 7.5 mm SOT287-1

97-05-22

99-12-27

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 40 of 48

Fig 24. SDIP32 package outline.

UNIT b1cEe M

REFERENCES

OUTLINE

VERSION EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC EIAJ

DIMENSIONS (mm are the original dimensions)

SOT232-1 92-11-17

95-02-04

bmax.

1.3

0.8 0.53

0.40 0.32

0.23 29.4

28.5 9.1

8.7 3.2

2.8 0.181.778 10.16 10.7

10.2 12.2

10.5 1.6

4.7 0.51 3.8

c(e )

seating plane

pin 1 index

0 5 10 mm

scale

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

(1) (1)

D(1)

max. 12

min. A

max.

SDIP32: plastic shrink dual in-line package; 32 leads (400 mil) SOT232-1

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 41 of 48

Fig 25. LQFP32 package outline.

UNIT A

max. A1A2A3bpcE

(1) eH

pZywv θ

REFERENCES

OUTLINE

VERSION EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC EIAJ

mm 1.60 0.20

0.05 1.45

1.35 0.25 0.4

0.3 0.18

0.12 7.1

6.9 0.8 9.15

8.85 0.9

0.5 7

0.25 0.11.0 0.2

DIMENSIONS (mm are the original dimensions)

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

0.75

0.45

SOT358 -1 136E03 MS-026 99-12-27

00-01-19

D(1) (1)(1)

7.1

6.9

9.15

8.85

0.9

0.5

EA1

detail X

(A )

HA2

vMB

vMA

24 17

pin 1 index

0 2.5 5 mm

scale

LQFP32: plastic low profile quad flat package; 32 leads; body 7 x 7 x 1.4 mm SOT358-1

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 42 of 48

18. Soldering

18.1 Introduction

This text gives a very brief insight to a complex technology. A more in-depth account

of soldering ICs can be found in our

Data Handbook IC26; Integrated Circuit

Packages

(document order number 9398 652 90011).

There is no soldering method that is ideal for all IC packages. Wave soldering is often

preferred when through-hole and surface mount components are mixed on one

printed-circuit board. However, wave soldering is not always suitable for surface

mount ICs, or for printed-circuit boards with high population densities. In these

situations reﬂow soldering is often used.

18.2 Surface mount packages

18.2.1 Reﬂow soldering

Reﬂow soldering requires solder paste (a suspension of ﬁne solder particles, ﬂux and

binding agent) to be applied to the printed-circuit board by screen printing, stencilling

or pressure-syringe dispensing before package placement.

Several methods exist for reﬂowing; for example, infrared/convection heating in a

conveyor type oven. Throughput times (preheating, soldering and cooling) vary

between 100 and 200 seconds depending on heating method.

Typical reﬂow peak temperatures range from 215 to 250 °C. The top-surface

temperature of the packages should preferable be kept below 230 °C.

18.2.2 Wave soldering

Conventional single wave soldering is not recommended for surface mount devices

(SMDs) or printed-circuit boards with a high component density, as solder bridging

and non-wetting can present major problems.

To overcome these problems the double-wave soldering method was speciﬁcally

developed.

If wave soldering is used the following conditions must be observed for optimal

results:

•Use a double-wave soldering method comprising a turbulent wave with high

upward pressure followed by a smooth laminar wave.

•For packages with leads on two sides and a pitch (e):

–larger than or equal to 1.27 mm, the footprint longitudinal axis is preferred to be

parallel to the transport direction of the printed-circuit board;

–smaller than 1.27 mm, the footprint longitudinal axis must be parallel to the

transport direction of the printed-circuit board.

The footprint must incorporate solder thieves at the downstream end.

•For packages with leads on four sides, the footprint must be placed at a 45° angle

to the transport direction of the printed-circuit board. The footprint must

incorporate solder thieves downstream and at the side corners.

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 43 of 48

During placement and before soldering, the package must be ﬁxed with a droplet of

adhesive. The adhesive can be applied by screen printing, pin transfer or syringe

dispensing. The package can be soldered after the adhesive is cured.

Typical dwell time is 4 seconds at 250 °C. A mildly-activated ﬂux will eliminate the

need for removal of corrosive residues in most applications.

18.2.3 Manual soldering

Fix the component by ﬁrst soldering two diagonally-opposite end leads. Use a low

voltage (24 V or less) soldering iron applied to the ﬂat part of the lead. Contact time

must be limited to 10 seconds at up to 300 °C.

When using a dedicated tool, all other leads can be soldered in one operation within

2 to 5 seconds between 270 and 320 °C.

18.3 Through-hole mount packages

18.3.1 Soldering by dipping or by solder wave

The maximum permissible temperature of the solder is 260 °C; solder at this

temperature must not be in contact with the joints for more than 5 seconds. The total

contact time of successive solder waves must not exceed 5 seconds.

The device may be mounted up to the seating plane, but the temperature of the

plastic body must not exceed the speciﬁed maximum storage temperature (Tstg(max)).

If the printed-circuit board has been pre-heated, forced cooling may be necessary

immediately after soldering to keep the temperature within the permissible limit.

18.3.2 Manual soldering

Apply the soldering iron (24 V or less) to the lead(s) of the package, either below the

seating plane or not more than 2 mm above it. If the temperature of the soldering iron

bit is less than 300 °C it may remain in contact for up to 10 seconds. If the bit

temperature is between 300 and 400 °C, contact may be up to 5 seconds.

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 44 of 48

18.4 Package related soldering information

[1] All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the

maximum temperature (with respect to time) and body size of the package, there is a risk that internal

or external package cracks may occur due to vaporization of the moisture in them (the so called

popcorn effect). For details, refer to the Drypack information in the

Data Handbook IC26; Integrated

Circuit Packages; Section: Packing Methods

[2] For SDIP packages, the longitudinal axis must be parallel to the transport direction of the

printed-circuit board.

[3] These packages are not suitable for wave soldering as a solder joint between the printed-circuit board

and heatsink (at bottom version) can not be achieved, and as solder may stick to the heatsink (on top

version).

[4] If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave

direction. The package footprint must incorporate solder thieves downstream and at the side corners.

[5] Wave soldering is only suitable for LQFP, QFP and TQFP packages with a pitch (e) equal to or larger

than 0.8 mm; it is deﬁnitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.

[6] Wave soldering is only suitable for SSOP and TSSOP packages with a pitch (e) equal to or larger than

0.65 mm; it is deﬁnitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.

Table 35: Suitability of IC packages for wave, reﬂow and dipping soldering methods

Mounting Package Soldering method

Wave Reﬂow[1] Dipping

Through-hole

mount DBS, DIP, HDIP, SDIP, SIL suitable[2] −suitable

Surface mount BGA, LFBGA, SQFP,

TFBGA not suitable suitable −

HBCC, HLQFP, HSQFP,

HSOP, HTQFP, HTSSOP,

SMS

not suitable[3] suitable −

PLCC[4], SO, SOJ suitable suitable −

LQFP, QFP, TQFP not recommended[4] [5] suitable −

SSOP, TSSOP, VSO not recommended[6] suitable −

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 45 of 48

19. Revision history

Table 36: Revision history

Rev Date CPCN Description

01 20000327 Preliminary speciﬁcation; initial version.

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 46 of 48

20. Data sheet status

[1] Please consult the most recently issued data sheet before initiating or completing a design.

21. Deﬁnitions

Short-form speciﬁcation — The data in a short-form speciﬁcation is

extracted from a full data sheet with the same type number and title. For

detailed information see the relevant data sheet or data handbook.

Limiting values deﬁnition — Limiting values given are in accordance with

the Absolute Maximum Rating System (IEC 60134). Stress above one or

more of the limiting values may cause permanent damage to the device.

These are stress ratings only and operation of the device at these or at any

other conditions above those given in the Characteristics sections of the

speciﬁcation is not implied. Exposure to limiting values for extended periods

may affect device reliability.

Application information — Applications that are described herein for any

of these products are for illustrative purposes only. Philips Semiconductors

make no representation or warranty that such applications will be suitable for

the speciﬁed use without further testing or modiﬁcation.

22. Disclaimers

Life support — These products are not designed for use in life support

appliances, devices, or systems where malfunction of these products can

reasonably be expected to result in personal injury. Philips Semiconductors

customers using or selling these products for use in such applications do so

at their own risk and agree to fully indemnify Philips Semiconductors for any

damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to

make changes, without notice, in the products, including circuits, standard

cells, and/or software, described or contained herein in order to improve

design and/or performance. Philips Semiconductors assumes no

responsibility or liability for the use of any of these products, conveys no

licence or title under any patent, copyright, or mask work right to these

products, and makes no representations or warranties that these products

are free from patent, copyright, or mask work right infringement, unless

otherwise speciﬁed.

23. Licenses

24. Trademarks

ACPI — is an open industry speciﬁcation for PC power management,

co-developed by Intel Corp., Microsoft Corp. and Toshiba

GoodLink — is a trademark of Royal Philips Electronics

OnNow — is a trademark of Microsoft Corp.

SMBus — is a bus speciﬁcation for PC power management, developed by

Intel Corp. based on the I2C-bus from Royal Philips Electronics

SoftConnect — is a trademark of Royal Philips Electronics

Datasheet status Product status Deﬁnition[1]

Objective speciﬁcation Development This data sheet contains the design target or goal speciﬁcations for product development. Speciﬁcation may

change in any manner without notice.

Preliminary speciﬁcation Qualiﬁcation This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips

Semiconductors reserves the right to make changes at any time without notice in order to improve design and

supply the best possible product.

Product speciﬁcation Production This data sheet contains ﬁnal speciﬁcations. Philips Semiconductors reserves the right to make changes at any

time without notice in order to improve design and supply the best possible product.

Purchase of Philips I2C components

Purchase of Philips I2C components conveys a license

under the Philips’ I2C patent to use the components in the

I2C system provided the system conforms to the I2C

speciﬁcation deﬁned by Philips. This speciﬁcation can be

ordered using the code 9398 393 40011.

Philips Semiconductors ISP1122A

USB stand-alone hub

Preliminary speciﬁcation Rev. 01 — 27 March 2000 47 of 48

Philips Semiconductors - a worldwide company

Argentina: see South America

Australia: Tel. +61 2 9704 8141, Fax. +61 2 9704 8139

Austria: Tel. +43 160 101, Fax. +43 160 101 1210

Belarus: Tel. +375 17 220 0733, Fax. +375 17 220 0773

Belgium: see The Netherlands

Brazil: see South America

Bulgaria: Tel. +359 268 9211, Fax. +359 268 9102

Canada: Tel. +1 800 234 7381

China/Hong Kong: Tel. +852 2 319 7888, Fax. +852 2 319 7700

Colombia: see South America

Czech Republic: see Austria

Denmark: Tel. +45 3 288 2636, Fax. +45 3 157 0044

Finland: Tel. +358 961 5800, Fax. +358 96 158 0920

France: Tel. +33 14 099 6161, Fax. +33 14 099 6427

Germany: Tel. +49 40 23 5360, Fax. +49 402 353 6300

Hungary: see Austria

India: Tel. +91 22 493 8541, Fax. +91 22 493 8722

Indonesia: see Singapore

Ireland: Tel. +353 17 64 0000, Fax. +353 17 64 0200

Israel: Tel. +972 36 45 0444, Fax. +972 36 49 1007

Italy: Tel. +39 039 203 6838, Fax +39 039 203 6800

Japan: Tel. +81 33 740 5130, Fax. +81 3 3740 5057

Korea: Tel. +82 27 09 1412, Fax. +82 27 09 1415

Malaysia: Tel. +60 37 50 5214, Fax. +60 37 57 4880

Mexico: Tel. +9-5 800 234 7381

Middle East: see Italy

Netherlands: Tel. +31 40 278 2785, Fax. +31 40 278 8399

New Zealand: Tel. +64 98 49 4160, Fax. +64 98 49 7811

Norway: Tel. +47 22 74 8000, Fax. +47 22 74 8341

Philippines: Tel. +63 28 16 6380, Fax. +63 28 17 3474

Poland: Tel. +48 22 5710 000, Fax. +48 22 5710 001

Portugal: see Spain

Romania: see Italy

Russia: Tel. +7 095 755 6918, Fax. +7 095 755 6919

Singapore: Tel. +65 350 2538, Fax. +65 251 6500

Slovakia: see Austria

Slovenia: see Italy

South Africa: Tel. +27 11 471 5401, Fax. +27 11 471 5398

South America: Tel. +55 11 821 2333, Fax. +55 11 829 1849

Spain: Tel. +34 33 01 6312, Fax. +34 33 01 4107

Sweden: Tel. +46 86 32 2000, Fax. +46 86 32 2745

Switzerland: Tel. +41 14 88 2686, Fax. +41 14 81 7730

Taiwan: Tel. +886 22 134 2865, Fax. +886 22 134 2874

Thailand: Tel. +66 27 45 4090, Fax. +66 23 98 0793

Turkey: Tel. +90 216 522 1500, Fax. +90 216 522 1813

Ukraine: Tel. +380 44 264 2776, Fax. +380 44 268 0461

United Kingdom: Tel. +44 208 730 5000, Fax. +44 208 754 8421

United States: Tel. +1 800 234 7381

Uruguay: see South America

Vietnam: see Singapore

Yugoslavia: Tel. +381 11 3341 299, Fax. +381 11 3342 553

For all other countries apply to: Philips Semiconductors,

International Marketing & Sales Communications,

Building BE, P.O. Box 218, 5600 MD EINDHOVEN,

The Netherlands, Fax. +31 40 272 4825

Internet: http://www.semiconductors.philips.com

(SCA69)

© Philips Electronics N.V. 2000. Printed in The Netherlands
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner.
The information presented in this document does not form part of any quotation or
contract, is believed to be accurate and reliable and may be changed without notice. No
liability will be accepted by the publisher for any consequence of its use. Publication
thereof does not convey nor imply any license under patent- or other industrial or
intellectual property rights.
Date of release: 27 March 2000 Document order number: 9397 750 06986
Contents
Philips Semiconductors ISP1122A
USB stand-alone hub
General description. . . . . . . . . . . . . . . . . . . . . .  1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
Ordering information. . . . . . . . . . . . . . . . . . . . .  2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . .  2
Pinning information. . . . . . . . . . . . . . . . . . . . . .  3
1 ISP1122AD (SO32) and ISP1122ANB (SDIP32) 3
1.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . .  3
2 ISP1122ABD (LQFP32) . . . . . . . . . . . . . . . . . .  6
2.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . .  6
Functional description  . . . . . . . . . . . . . . . . . . .  8
1 Analog transceivers . . . . . . . . . . . . . . . . . . . . .  8
2 Philips Serial Interface Engine (SIE). . . . . . . . .  9
3 Hub repeater. . . . . . . . . . . . . . . . . . . . . . . . . . .  9
4 End-of-frame timers . . . . . . . . . . . . . . . . . . . . .  9
5 General and individual port controller. . . . . . . .  9
6 GoodLink  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
7 Bit clock recovery . . . . . . . . . . . . . . . . . . . . . . .  9
8 Voltage regulator  . . . . . . . . . . . . . . . . . . . . . . .  9
9 PLL clock multiplier. . . . . . . . . . . . . . . . . . . . .  10
10 Overcurrent detection. . . . . . . . . . . . . . . . . . .  10
11 I2C-bus interface. . . . . . . . . . . . . . . . . . . . . . .  10
Modes of operation . . . . . . . . . . . . . . . . . . . . .  10
Endpoint descriptions. . . . . . . . . . . . . . . . . . .  11
1 Hub endpoint 0 (control). . . . . . . . . . . . . . . . .  11
2 Hub endpoint 1 (interrupt). . . . . . . . . . . . . . . .  11
Host requests. . . . . . . . . . . . . . . . . . . . . . . . . .  12
1 Standard requests  . . . . . . . . . . . . . . . . . . . . .  12
2 Hub specific requests . . . . . . . . . . . . . . . . . . .  13
3 Descriptors . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
4 Hub responses . . . . . . . . . . . . . . . . . . . . . . . .  18
4.1 Get device status . . . . . . . . . . . . . . . . . . . . . .  18
4.2 Get configuration  . . . . . . . . . . . . . . . . . . . . . .  18
4.3 Get interface status. . . . . . . . . . . . . . . . . . . . .  18
4.4 Get hub status  . . . . . . . . . . . . . . . . . . . . . . . .  18
4.5 Get port status . . . . . . . . . . . . . . . . . . . . . . . .  19
4.6 Get configuration descriptor . . . . . . . . . . . . . .  20
4.7 Get device descriptor . . . . . . . . . . . . . . . . . . .  20
4.8 Get hub descriptor . . . . . . . . . . . . . . . . . . . . .  20
4.9 Get string descriptor (0) . . . . . . . . . . . . . . . . .  20
4.10 Get string descriptor (1) . . . . . . . . . . . . . . . . .  20
4.11 Get string descriptor (2) . . . . . . . . . . . . . . . . .  20
I2C-bus interface  . . . . . . . . . . . . . . . . . . . . . . .  20
1 Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
2 Hardware connections . . . . . . . . . . . . . . . . . .  21
3 Data transfer. . . . . . . . . . . . . . . . . . . . . . . . . .  21
Hub power modes . . . . . . . . . . . . . . . . . . . . . .  22
1 Voltage drop requirements . . . . . . . . . . . . . . .  22
1.1 Self-powered hubs . . . . . . . . . . . . . . . . . . . . .  22
1.2 Bus-powered hubs . . . . . . . . . . . . . . . . . . . . .  23
Overcurrent detection . . . . . . . . . . . . . . . . . . .  24
1 Overcurrent circuit description . . . . . . . . . . . .  24
2 Power switch selection . . . . . . . . . . . . . . . . . .  24
3 Tuning the overcurrent trip voltage. . . . . . . . . 25
4 Reference circuits. . . . . . . . . . . . . . . . . . . . . . 25
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . .  30
Static characteristics. . . . . . . . . . . . . . . . . . . .  31
Dynamic characteristics . . . . . . . . . . . . . . . . .  32
Test information. . . . . . . . . . . . . . . . . . . . . . . .  38
Package outline . . . . . . . . . . . . . . . . . . . . . . . .  39
Soldering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  42
1 Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . .  42
2 Surface mount packages . . . . . . . . . . . . . . . . 42
2.1 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . .  42
2.2 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . .  42
2.3 Manual soldering. . . . . . . . . . . . . . . . . . . . . . .  43
3 Through-hole mount packages. . . . . . . . . . . . 43
3.1 Soldering by dipping or by solder wave  . . . . .  43
3.2 Manual soldering. . . . . . . . . . . . . . . . . . . . . . .  43
4 Package related soldering information . . . . . .  44
Revision history . . . . . . . . . . . . . . . . . . . . . . . .  45
Data sheet status . . . . . . . . . . . . . . . . . . . . . . .  46
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  46
Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . .  46