General Description
The MAX3421 evaluation kit-1 (EV kit-1) provides a
proven design to evaluate the MAX3421E USB periph-
eral controller with SPI™ interface. The EV kit contains
both a MAX3421E USB host & peripheral controller and
a MAX3420E USB peripheral controller for user evalua-
tion and development. Connector J4 is wired to plug
into a Keil MCB2130 development board that contains
a Philips ARM controller (LPC2318). The design uses
two separate SPI ports to provide independent opera-
tion of the two USB controllers (MAX3421E and
MAX3420E).
The MAX3421 EV kit-1 adds USB functionality to any
microcontroller, microprocessor, DSP, CPLD, FPGA, or
ASIC with an SPI master interface, or five GPIO lines.
The EV kit-1 board comes with the MAX3421EEHJ+
and MAX3420EECJ+ installed.
Features
♦Ideal USB Training and Debugging System
♦Mates to Keil MCB2130 Development Board
♦Can Be Wired into User Systems
♦MAX3421E Can Be Used as a USB Host or
Peripheral
♦MAX3420E Provided On-Board as a Test
Peripheral
♦MAX3420E Can be Used to Develop USB
Peripheral Code
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
________________________________________________________________
Maxim Integrated Products
1
19-0697; Rev 0; 12/06
Component List
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
SPI is a trademark of Motorola, Inc.
+
Denotes a lead-free and RoHS-compliant EV kit.
PART NUMBER TYPE PC INTERFACE
MAX3421EVKIT-1+ EV kit USB
DESIGNATION QTY DESCRIPTION
C1, C3, C5, C6,
C8, C9 6
2.2µF ±10%, 10V X5R ceramic
capacitors (0805)
TDK C2012X5R1A225KB
C2, C4, C7,
C10 4
1µF ±10%, 16V X5R ceramic
capacitors (0603)
TDK C1608X5R1C105K
C11–C14 0
Not installed, 18pF ±5%, 50V C0G
ceramic capacitors (0402)
TDK C1005C0G1H180J
C15 1
0.1µF, 5V (min) X7R ceramic
capacitor (0603)
TDK C1608X7R1C104K,
C1608X7R1E104K, or
C1608X7R1H104K
Panasonic-ECG ECJ-1VB1C104K
KEMET C0603C104K3RAC
AVX 0603ZC104KAT
D1–D4 4 Green LEDs (0805)
Lumex Opto SML-LX0805UPGC-TR
D5 1
7-segment LED display,
common-cathode
LITE-ON LSHD-7503
DESIGNATION QTY DESCRIPTION
J1 1 USB type A right-angle receptacle
Assmann Electronic AU-Y1006-R
J2, J5 2 USB type B right-angle receptacles
Assmann Electronic AU-Y1007-R
J3 1 3-pin header
J4 1 2 x 18 right-angle female receptacle
PB1–PB8 8
6mm light-touch switches with
GND (H = 7)
Panasonic-ECG EVQ-PBC07K
R1–R4 4 33Ω ±5% resistors (0603)
R5–R16 12 470Ω ±5% resistors (0603)
R17, R18 2 2.2kΩ ±5% resistors (0603)
U1 1
MAX3421EEHJ+ USB peripheral/host
controller with SPI interface (32-pin,
5mm x 5mm, TQFP)
U2 1
MAX3420EECJ+ USB peripheral
controller with SPI
interface (32-pin, 7mm x 7mm, TQFP)
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
2 _______________________________________________________________________________________
Component List (continued)
DESIGNATION QTY DESCRIPTION
U3 1
MAX4793EUK+ 300mA current-limit
switch (SOT23-5)
Top mark "AEAG"
Y1, Y2 2 12MHz ceramic resonators
Murata CSTCE12M0G15
Y3, Y4 0
Not installed, 12MHz crystal; 18pF
load (HCM49 SMD case)
Citizen HCM49-12.000MABJ-UT
DESIGNATION QTY DESCRIPTION
— 1 MAX3421EVKIT-1+ PCB
—1
USB high-speed A-to-B cables, 5ft
(1.5m)
Assmann Electronic AU-Y1002A-R
—1
36-pin, dual-row vertical header, with
certain pins removed
— 1 Red power wire
Component Suppliers
SUPPLIER PHONE WEBSITE
Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com
Panasonic Corp. 800-344-2112 www.panasonic.com
TDK Corp. 847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX3421E and MAX3420E when contacting these component suppliers.
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
_______________________________________________________________________________________ 3
Detailed Description
of Hardware
The MAX3421 EV kit-1 has three USB connectors
(Figure 1). The MAX3421E is wired to USB connectors
J1 and J2. Plug a cable into USB Type A connector J1
when using the MAX3421E as a host. Plug a cable into
USB Type B connector J2 when using the MAX3421E
as a peripheral. Do not use J1 and J2 at the same
time. Connectors J1 and J2 have their D+ and D- pins
wired together, and are intended to be connected only
one at a time. USB peripheral controller MAX3420E is
wired to USB Type B connector J5.
When the MAX3421E (U1) operates as a host, the EV
kit must supply VBUS power to USB Type A connector
J1. This power must in turn be supplied to the EV kit
through power connector J3, which is located in the
middle of the board. When mated with a board such as
the Keil MCB2130, a “flying lead” can be attached
between J3 and the Keil board’s 5V IN test pad.
Alternatively, a standard 5VDC lab supply can be used.
The MAX4793 (U3) controls and current-limits the VBUS
voltage. U1 can turn VBUS power on and off using one
of its GP-OUT pins (GPOUT7), and can detect a
300mA overcurrent condition on GP-IN pin, (GPIN0).
Refer to the MAX4793 data sheet for more information.
Buttons and lights are connected to both the
MAX3420E and MAX3421E controllers. U1 drives a
7-segment readout and connects to four pushbuttons
(PB1–PB4). U2 drives four LEDS and connects to push-
buttons PB5–PB8.
The MAX3420E and MAX3421E connect to two sepa-
rate SPI ports (see Table 1). This allows host and
peripheral applications to run concurrently in the same
code, when implemented on a dual-SPI microcontroller
(such as the ARM LPC2318 used on the Keil MCB2130
board). This provides an ideal USB training and debug-
ging system. The host can dispatch USB requests to
the peripheral, the peripheral can respond, and the
host can evaluate the results—all in the same C code.
Stand-Alone Operation
Although the MAX3421 EV kit-1 is designed to plug into
a Keil MCB2130 board, it also functions as a stand-
alone board that can be wired into any customer sys-
tem with an SPI interface. Table 1 shows the J4 pins
that correspond to the MAX3420E and MAX3421E
interfaces.
MAX3420E
USB PERIPHERAL
CONTROLLER
(U2)
MAX3421E
USB HOST AND
PERIPHERAL
CONTROLLER
(U1)
MAX4793
CURRENT-LIMITED
SWITCH (U3)
J1
USB TYPE A
VBUS
USB TYPE B
J3
ON
FLAG
5V IN
J4
SPI, POWER SPI, POWER
J2
USB TYPE B
J5
Figure 1. Block Diagram
User Notes:
1) The MAX3420E connects to USB Type B connector
J5, while the MAX3421E connects both to USB Type
A connector J1 and to USB Type B connector J2.
The MAX3421E, therefore, can be connected as a
host (J1) or a peripheral (J2).
2) The user system must supply 3.3V on J4 pins 1-2 to
power the board. The 3.3V supply should be capa-
ble of providing 100mA.
3) The RES pins connect directly to the MAX3420E/
MAX3421E reset pins. It must be driven high for the
chip to operate.
4) When operating the MAX3421E as a host controller,
the user system must provide 5V power on J4 pins
33-34, or on J3 pin 3. This voltage connects to the
VBUS pin of USB Type A connector J1 through a
current-limiting switch. The user system must supply
enough current to power any USB device plugged
into J1. The current-limiting switch (a MAX4793) lim-
its the VBUS current to 300mA.
5) Keep leads to the target system short (under 6in).
Long leads and insufficient grounds can lead to sig-
nal ringing and erratic operation.
6) When using the MAX3421E as a host, the user
program must set the MAX3421E GPO7 pin high
to turn on the VBUS switch (U3) that supplies 5V to
the USB Type A connector J1. Note that the
MAX3421E output port also drives the 7-segment
readout using GPO[6:0]. Therefore, the code that
updates the 7-segment readout must preserve the
bit 7 setting, and the code that turns VBUS on and
off must preserve the bits [6:0] settings. This is easi-
ly accomplished by first reading the states of the
output bits, changing only the needed bits, then
writing them back.
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
4 _______________________________________________________________________________________
Table 1. J4 Interface to the MAX3420E and MAX3421E
J4 PIN MAX3420E MAX3421E
1 3.3V (in) 3.3V (in)
2——
3——
4 — SCK (in)
5 — MISO (out)
6 SCK (in) —
7——
8 MISO (out) —
9——
10 MOSI (in) —
11 GPX (out) —
12 SS (in) —
13 — —
14 — —
15 — —
16 RES (in) —
17 — —
18 — RES (in)
J4 PIN MAX3420E MAX3421E
19 — —
20 — —
21 — —
22 — INT (out)
23 — —
24 — —
25 INT (out) —
26 — SS (in)
27 — SCK (in)
28 — —
29 — MISO (out)
30 — GPX (out)
31 — MOSI (in)
32 — —
33 — 5V (in)
34 — 5V (in)
35 GND GND
36 GND GND
Evaluates: MAX3421E/MAX3420E
MAX3421E
U1
GPOUT4
GPOUT5 9
D5
R15
470Ω
GPOUT3GPOUT2GPOUT1GPOUT0GNDVL
GPIN7
GPXINTGNDD-D+VBCOMP
PB1
VCC
XI
GPOUT6 10
GPOUT7 11
RES 12
3
SCLK
FLAG
13
SS 14
FLAG
MISO 15
MOSI
GPIN6
GPIN5
GPIN4
GPIN3
GPIN2
GPIN1
GPIN0
XO 16
32
31
30
1
4
2
5
29
28
27
26
25
24 23 22 21 20 19 18 17
1
7
3.3V 2345678
R5
470Ω
C4
1μFR13
470Ω
R14
470Ω
R16
470Ω
R12
470Ω
R11
470Ω
R10
470Ω
25438
61
9 10
PB2
3
1
4
2
5
PB3
3
1
4
2
5
PB4
3
1
4
2
5
X1
X2 3
Y3 1
Y1
GND
2
VBUS
D+ 3
D- 2
D+
D-
GND 4
1
J2
CON_USB-B
SHIELD
6
SHIELD
5
C12
18pF
C11
18pF
C2
1μF
C1
2.2μF
C3
2.2μF
3.3V
J2-5V
GND
GND
D- 2
D+ 3
D-
D+
VBUS 1
4
J1
CON_USB-A
SHIELD
5
SHIELD
6
C5
2.2μF
R1
33Ω
R2
33Ω
R17
2.2kΩ
OUT 5
4
IN
1
2
J3 3
1
GND
2
ON
3
J1-5V
03_HGPX
19_HMOSI
C15
0.1μF
18_HMISO
20_HSSN
17_HSCK
13_HRESN
15_HINT
3.3V
MAX4793
U3 J1-5V
FLAG
+5V
22_PGPX
19_HMOSI
18_HMISO
17_HSCK
16_PINT
03_HGPX
20_HSSN
15_HINT
13_HRESN
12_PRESN
07_PSSN
06_PMOSI
05_PMISO
04_PSCK
J4-35 J4-36
J4-33 J4-34
J4-31 J4-32
J4-29 J4-30
J4-27 J4-28
J4-25 J4-26
J4-23 J4-24
J4-21 J4-22
J4-19 J4-20
J4-17 J4-18
J4-15 J4-16
J4-13 J4-14
J4-11 J4-12
J4-9 J4-10
J4-7 J4-8
J4-5 J4-6
J4-3 J4-4
J4-1 J4-2
J4
C6
2.2μF
3.3V
Y1 TAKES PLACE OF Y3, C11 & C12
1*
1*
1*
1*
Figure 2a. MAX3421 EV Kit-1 Schematic
MAX3421 Evaluation Kit-1
_______________________________________________________________________________________ 5
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
6 _______________________________________________________________________________________
MAX3420E
U2
N.C.
INT 17
D4
D3
GPXMOSIMISOSS
SCLKRESN.C.
N.C.XIXON.C.GPIN0GPIN1GPIN2GPIN3
GND 18
GND 19
D- 20
D+ 21
VCC
22
VCC
23
VBCOMP
GPOUT3
GPOUT2
GND
GND
VL
VL
GPOUT1
GPOUT0 24
8
7
6
5
4
3
2
1
32 31 30 29 28 27 26 25
910111213141516
PB5
3
1
4
2
5
PB6
3
1
4
2
5
PB7
3
1
4
2
5
PB8
3
1
4
2
5
VBUS
D+
3
D-
2
GND
4
1
J5
R3
33Ω
R4
33Ω
R18
2.2kΩ
R9
470Ω
R8
470Ω
CON_USB-B
SHIELD 6
SHIELD 5
C9
2.2μF
C7
1μF
J5-5V
X2
X1
1
Y4
3
Y2
GND 2
C14
18pF
C13
18pF
2*
2*
2* Y2 TAKES PLACE OF Y4, C13 & C14
2*
C8
2.2μF
3.3V
C10
1μF
3.3V
3.3V
16_PINT
22_PGPX
06_PMOSI
05_PMISO
07_PSSN
04_PSCK
12_PRESN
D2
D1
R7
470Ω
R6
470Ω
Figure 2b. MAX3421 EV Kit-1 Schematic
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
_______________________________________________________________________________________ 7
Figure 3. MAX3421 EV Kit-1 Component Placement Guide—Component Side
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
8 _______________________________________________________________________________________
Figure 4. MAX3421 EV Kit-1 PCB Layout—Component Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________
9
© 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Evaluates: MAX3421E/MAX3420E
MAX3421 Evaluation Kit-1
Figure 5. MAX3421 EV Kit-1 PCB Layout—Solder Side
