AR1100-I/MQ - MICROCHIP

 2011 Microchip Technology Inc. DS41606B

AR1100 Resistive USB and RS-232

Touch Screen Controller

Data Sheet

DS41606B-page 2  2011 Microchip Technology Inc.

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ISBN: 978-1-61341-833-8

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 2011 Microchip Technology Inc. DS41606B-page 3

Special Features:

• RoHS Compliant

• Power-saving Sleep mode

• Industrial Temperature Range

• Built-in Drift Compensation Algorithm

• 96 Bytes of User EEPROM

Power Requirements:

• Operating Voltage: 3.3-5.0V +/- 5%

• Standby Current:

- <10 uA (UART)

- <325 uA (USB)

• Operating Current:

- <17 mA (no touch)

- <25 mA (touch) (see Note below)

Touch Modes:

• Off, Stream, Down and Up

Touch Sensor Support:

• 4-wire, 5-wire and 8-wire Analog Resistive

• Lead-to-Lead Resistance: 50-2000 Ohm

• Layer-to-Layer Capacitance: 0-0.5 uF

Touch Resolution:

• 10-bit Resolution (maximum)

Touch Coordinate Report Rate:

• 150 Reports Per Second (typ.) (see Note below)

Communication:

• Automatic Detection/Selection

• UART, 9600 BAUD

• USB V2.0 Compliant, Full Speed

- HID-GENERIC

-HID-MOUSE

- HID-DIGITIZER

Package Types

The device will be offered in the following packages:

• 20-Lead QFN (5 x 5 mm)

• 20-Lead SOIC

• 20-Lead SSOP

Note: Results vary slightly with sensor.

Note: Actual report rate is dynamically/automat-

ically maximized according to the electri-

cal characteristics of the sensor in use.

AR1100 RESISTIVE USB AND RS-232

TOUCH SCREEN CONTROLLER

AR1100 Resistive USB and RS-232 Touch Screen Controller

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 4  2011 Microchip Technology Inc.

Table of Contents

1.0 Device Overview .......................................................................................................................................................................... 5

2.0 Implementation – Quick Start ....................................................................................................................................................... 7

3.0 Hardware...................................................................................................................................................................................... 9

4.0 Communication) ......................................................................................................................................................................... 13

5.0 Commands ................................................................................................................................................................................. 21

6.0 Configuration Registers.............................................................................................................................................................. 25

7.0 Operation.................................................................................................................................................................................... 29

8.0 Boot Loader................................................................................................................................................................................ 33

9.0 EEPROM Map............................................................................................................................................................................ 37

10.0 Electrical Specifications.............................................................................................................................................................. 39

11.0 Packaging Information................................................................................................................................................................ 41

Appendix A: Revision History............................................................................................................................................................... 51

Appendix B: Device Differences........................................................................................................................................................... 51

Index .................................................................................................................................................................................................... 53

The Microchip Web Site ....................................................................................................................................................................... 55

Customer Change Notification Service ................................................................................................................................................ 55

Customer Support ................................................................................................................................................................................ 55

Reader Response ................................................................................................................................................................................ 55

Product Identification System............................................................................................................................................................... 57

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Customer Notification System

 2011 Microchip Technology Inc. DS41606B-page 5

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

1.0 OVERVIEW

The Microchip mTouchTM AR1100 Analog Resistive

USB and RS-232 Touch Screen Controller represents

a feature-rich, fully-integrated universal touch screen

controller solution. The AR1100 automatically selects

between USB and RS-232 communication protocols,

as well as supports 4, 5 or 8-wire analog resistive touch

screens from any of a variety of touch screen

manufacturers. The AR1100 dynamically adapts to the

various touch screen electrical characteristics such as

sensitivity, contact resistance, and capacitance to

provide optimal performance with minimal design time.

Building on the AR1000 series, the new AR1100 offers

customers an easy-to-integrate solution for low-cost,

high-performing resistive touch with the advantages of

USB plug and play, support for USB mouse or digitizer,

advanced touch response and accuracy, field flash

updatability, and free drivers for most operating sys-

tems to enable low risk designs for a wide variety of

touch sensing requirements.

The AR1100 supports large displays like industrial con-

trols, self-service kiosks, and POS terminals, as well as

smaller tablet displays, handheld consumer devices,

and medical devices.

Resistive touch provides the advantages of easy

integration, low total system cost and acceptance of

finger, glove or stylus input, and USB communication is

the industry standard for attaching peripherals to a

computer. The AR1100 is an easy-to-integrate touch

screen controller that meets all of these needs in a

single-chip solution or production ready-board product.

The device comes with free drivers for most major

operating systems, making it easy for designers to

quickly create low-risk touch interface solutions.

1.1 Applications

The AR1100 is suitable for any application that requires

fast, accurate and reliable integration of touch –

including, but not limited to:

• Mobile communication devices

• Personal Digital Assistants (PDA)

• Global Positioning Systems (GPS)

• Touch Screen Monitors

•KIOSK

• Media Players

• Portable Instruments

• Point of Sale Terminals

FIGURE 1-1: BLOCK DIAGRAM

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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NOTES:

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

2.0 IMPLEMENTATION – QUICK

START

The AR1100 is designed to be a fully-functioning touch

controller on power-up – no configuration is necessary

and only minimal hardware support is needed to create

a universal controller board (refer to simplified

schematic).

The hard-coded defaults for the operational

parameters are suitable for all but the most unique

circumstances. A jumper on the MODE pin easily

selects the sensor type (5-Wire or 4/8-Wire) and the

Communication mode (USB or UART) is automatically

detected and selected by the device. If USB is

detected, the AR1100 automatically defaults to a

HID-MOUSE, compatible with intrinsic drivers of

standard operating systems. Any desired modifications

to either the operating parameters or USB device type

can be easily saved to internal nonvolatile memory to

override the defaults.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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NOTES:

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

3.0 HARDWARE

3.1 Pin Assignments

TABLE 3-1: PIN ASSIGNMENTS

Pin Function Description/Comments

SSOP, SOIC QFN

118 V

DD Power

2 19 OSC1 Oscillator

3 20 OSC2 Oscillator

41 MODEG

ND: 5-Wire

Open: 4-/8-Wire

5 2 LED Led control

6 3 (Y+) Sensor connection

4W: n/a

5W: n/a

8W: Y+

7 4 X+ Sensor connection

8 5 SY- Sensor connection

9 6 SX+ Sensor connection

10 7 UART-TX UART Transmit Data

11 8 WAKE Wake pin

12 9 UART-RX UART Receive Data

13 10 SX- Sensor connection

4W: n/a

5W: WSX-

8W: SX-

14 11 X- Sensor connection

15 12 Y+(SY+) Sensor connection

4W: Y+

5W: Y+

8W: SY+

16 13 Y- Sensor connection

17 14 VUSB USB Internal Voltage Reference

18 15 USB-D- USB data I/O

19 16 USB-D+ USB data I/O

20 17 VSS GND

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 10  2011 Microchip Technology Inc.

3.2 Schematic

A simplified schematic is provided below. A detailed

schematic and BOM is given in FIGURE B-1: “Sche-

matic” and FIGURE B-2: “Bill of Materials”.

FIGURE 3-1: SIMPLIFIED SCHEMATIC

3.3 Sensor Attachment

AR1100 connections to the various sensor types are

described graphically in Figure 3-2.

FIGURE 3-2: SENSOR EQUIVALENT CIRCUIT MODELS

Note: Unused SENSOR pins should be

grounded.

 2011 Microchip Technology Inc. DS41606B-page 11

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

3.4 ESD Considerations

Suggested ESD protection is shown on the reference

schematic (See FIGURE B-1: “Schematic”).

Additional/alternate ESD countermeasures may be

employed to meet application-specific requirements.

Test to ensure the selected ESD protection does not

degrade touch performance.

3.5 Noise Considerations

Touch sensor filtering capacitors are included in the

reference design schematic (See FIGURE B-1:

“Schematic”).

Note: ESD protection diodes are recommended

for all active sensor lines but care should

be taken to minimize capacitance. As an

example, PESD5V0S1BA is

recommended and used on reference

designs due to its nominally-low 35 pF.

Note: Changing the value of the sensor filter

capacitors may adversely affect touch

performance.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 12  2011 Microchip Technology Inc.

NOTES:

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

4.0 COMMUNICATION

4.1 Physical

The AR1100 supports UART and USB communication

and will automatically detect the active mode between

the two. Additionally, USB mode will enumerate as one

of three ‘devices’. The default USB device type is

defined (and can be changed) by the configuration

command and is saved in nonvolatile memory. The fac-

tory default is HID-MOUSE.

1. UART/Serial

2. HID-GENERIC

3. HID-MOUSE

4. HID-DIGITIZER

4.1.1 MODE DETECT/SELECT

To support auto-detection – the firmware and hardware

resources for UART and USB are both functional at

power-up until the active mode is determined by one of

the following events.

1. USB successfully enumerates – result: USB is

active

2. Valid communication is received via UART –

result: UART is active

3. The Sleep timer has expired and USB has not

yet enumerated – result: UART is active (by

default)

Once the active communication mode is determined,

the ‘inactive’ mode is decommissioned to minimize

power. The active communication mode will remain in

force until the AR1100 is reset.

4.1.2 UART MODE

In UART mode, the AR1100 supports a simple, 2-wire

(transmit/receive) asynchronous serial communication.

The device does not support hardware handshaking

but does employ a data protocol handshake described

in the device command section. The host should be

configured for 9600 BAUD, 8 data bits and 1 Stop bit.

Note: Immediately after Reset, the AR1100 will

not attempt to ‘Sleep’ for at least 45

seconds to allow time for USB

enumeration – no matter the setting of the

Sleep timer parameter.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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4.1.3 USB MODE

The USB can enumerate as one of three ‘devices’ (or

device types) identified by a byte in EEPROM. See

Table 4-1.

The HID-MOUSE and HID-DIGITIZER types are

recognized by many host operating systems and will

provide cursor movement with a touch.

The HID-GENERIC type is a proprietary style, which

would require a custom software driver to support.

The controller defaults to the HID-MOUSE device type,

unless it is commanded to enumerate as one of the

other supported types.

Once enumerated, the USB device can be

signaled/commanded to re-enumerate as the same

device or to one of the other two. In processing the

command, the AR1100 writes the desired USB device

type to EEPROM prior to detaching from the bus and

executing a Reset. The SET_FEATURE control transfer

or a WRITE standard data transfer (via the Interrupt

end point) is used to convey the command (described

in Section 5.0, Commands).

4.2 Data Protocol

Data protocol utilizes multi-byte packet transfers in two

categories/formats:

1. Touch reports

2. Command packets

4.2.1 TOUCH REPORTS

Touch reports always originate from the AR1100 and

are transmitted in response to touch detection. The

format of the touch report is mode-dependent.

The measurement resolution for touch coordinates is

10-bit. The measured values are shifted (multiplied by

4) and reported in a 12-bit format. In the reporting

protocol, the Least Significant coordinate bits X1:X0

and Y1:Y0 will be zeros. The resulting full-scale range

for reported touch coordinates is 0 to 4095.

4.2.1.1 Mode: UART, HID-GENERIC

The ‘standard’, 5-byte touch report is formatted as in

Table 4-2:

TABLE 4-1: USB IDs

NAME DESC CLASS VENDOR

PRODUCT

ID SPEED

HID-GENERIC Proprietary (AR1000-style) HID x04D8 x0C01 FULL

HID-MOUSE Mouse, absolute coordinates 0-4095 HID x04D8 x0C02 FULL

HID-DIGITIZER Single-input digitizer HID x04D8 x0C03 FULL

Note: The HID-MOUSE requires SET_FEATURE

and does not support a data WRITE.

 2011 Microchip Technology Inc. DS41606B-page 15

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

Up to three touch reports are sent in response to each

touch ‘event’ (events are defined as: pen down, pen up

and pen move). A behavior is defined per event by the

‘Touch mode’ configuration parameter and described in

Table 4-3 below.

TABLE 4-2: TOUCH REPORT FORMAT – GENERIC

BYTE

BIT

76543210

1 1 R RRRRRP

2 0 X6 X5 X4 X3 X2 X1 X0

3 0 0 0 X11 X10 X9 X8 X7

4 0 Y6 Y5 Y4 Y3 Y2 Y1 Y0

5 0 0 0 Y11 Y10 Y9 Y8 Y7

P Pen state - 1: Pen down - 0: Pen up

R(Reserved)

X X ordinate of touch location (12 bits)

Y Y ordinate of touch location (12 bits)

TABLE 4-3: TOUCH MODE OPTIONS – GENERIC

MODE

SUPPORTED EVENT

BEHAVIOR

PD PU PM

0 X X X NO REPORT

1 X X X REPORT (P=0)

2 X X X REPORT (P=1)

3 X X X REPORT (P=1), REPORT (P=0)

4 X X REPORT (P=0), REPORT (P=1), REPORT (P=0)

5 X X REPORT (P=0), REPORT (P=1)

PD Pen down

PU Pen up

PM Pen move

Report Touch report

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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4.2.1.2 Mode: HID-MOUSE

Touch report format:

TABLE 4-4: TOUCH REPORT FORMAT – MOUSE

BYTE

BIT

76543210

1 0 0 0 0 0 B3 B2 B1

2 X7 X6 X5X4X3X2X1X0

30000X11X10X9X8

4 Y7 Y6 Y5Y4Y3Y2Y1Y0

50000Y11Y10Y9Y8

B1 Button 1 depressed

B2 Button 2 depressed

B3 Button 3 depressed

X X ordinate of touch location (12 bits)

Y X ordinate of touch location (12 bits)

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

4.2.1.3 Mode: HID-DIGITIZER

Touch report format:

For flexibility, the value and behavior of the ‘tip switch’

data entity (“T”) and touch reporting react to and is

defined by the ‘Touch mode’ parameter (similar to ‘pen

state’ bit in HID-GENERIC or UART).

4.2.2 COMMAND PACKETS

PACKETs are used for all communications, other than

touch reports (i.e., configuration/control). COMMAND

packets (issued by the host) and RESPONSE packets

(issued by the device) have identical framework but dif-

fer slightly in format, as described below. In standard

operation, communication is initiated by the host then

acknowledged by the device. In some diagnostic sce-

narios (not discussed here) – a COMMAND packet

does not necessarily dictate a response from the

device and, in other cases, a RESPONSE packet may

be issued by the device unsolicited.

TABLE 4-5: TOUCH REPORT FORMAT – DIGITIZER

BYTE

BIT

76543210

1000000PT

200000000

3 X7 X6 X5X4X3X2X1X0

40000X11X10X9X8

5 Y7 Y6 Y5Y4Y3Y2Y1Y0

60000Y11Y10Y9Y8

T Tip switch

P Proximity (in range) – always 1

X X ordinate of touch location (12 bits)

Y X ordinate of touch location (12 bits)

TABLE 4-6: TOUCH MODE OPTIONS – DIGITIZER

MODE

SUPPORTED EVENT

BEHAVIOR

PD PU PM

0 X X X NO REPORT

1 X X X REPORT (T=0)

2 X X X REPORT (T=1)

3 X X X REPORT (T=1), REPORT (T=0)

4 X X REPORT (T=0), REPORT (T=1), REPORT (T=0)

5 X X REPORT (T=0), REPORT (T=1)

PD Pen down

PU Pen up

PM Pen move

Report Touch report

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4.2.2.1 Construction

GENERAL

The generic framework for all packets (Figure 4-1) is

comprised of a SYNC byte, a SIZE byte and a DATA

section. The DATA section has a maximum size of 255

total bytes.

FIGURE 4-1: PACKET FORMAT –

GENERAL

COMMAND

A COMMAND packet has a minimum of 3 bytes

defined as SYNC, SIZE and CMND. The DATA section

is command-dependant and can include up to 254

associated data bytes (D[1] – D[N]). See Figure 4-2.

FIGURE 4-2: PACKET FORMAT – COMMAND

RESPONSE

A RESPONSE packet has a minimum of 4 bytes

defined as SYNC, SIZE, STATUS and CMND. As with

the COMMAND packet, the RESPONSE packet is

command-dependant and can include up to 253 asso-

ciated data bytes. In cases where the RESPONSE

packet is in direct response to a COMMAND packet,

the CMND byte is the same in both.

FIGURE 4-3: PACKET FORMAT – RESPONSE

4.2.2.2 Mode: UART

In UART communication mode a complete COMMAND

packet must be delivered before the packet ‘time-out’

timer expires (~250 ms). A packet ‘time out’ will cause

any partial packet to be discarded and the packet pars-

ing state controller to reset. Using this mechanism, the

host can always ensure (re-establish) ‘SYNC’ by paus-

ing for 250+ ms before sending another packet.

4.2.2.3 Mode: USB

Typically, a packet arrives (and is delivered) in a single,

64-byte (max.) USB buffer. Theoretically, a COMMAND

packet can span multiple, physical USB buffers but will

be subject to the packet time-out criteria described in

the UART section. A RESPONSE packet will always be

delivered in a single buffer and a buffer will never

contain more than one.

SYNC SIZE DATA

0x55 N D[1] D[N]

SYNC SIZE DATA

0x55 N+1 CMND D[1] D[N]

SYNC SIZE DATA

0x55 N+2 STATUS CMND D[N]D[1]

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

4.2.2.4 Mode Capabilities

Only two of the four AR1100 communication modes,

UART and HID-GENERIC, support ‘low-level’

operations such as:

1. Configuration

2. Calibration

3. Boot loading (field re-programming)

The remaining two communication modes,

HID-MOUSE and HID-DIGITIZER, only support output

of TOUCH REPORT(s) and only receive (respond to)

mode change command(s). They can be supported by

intrinsic operating system driver(s). To configure, cali-

brate and/or reprogram these two devices, the host

must cause them to re-enumerate as HID-GENERIC.

Once the low-level operations are complete, the host

can then re-configure back to the desired device.

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NOTES:

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

5.0 COMMANDS

In normal operation, the AR1100 automatically returns

‘touch reports’ in response to a touch – no ‘prompting’

is required from the host. The following command set

can be used to configure the parameters used to

‘fine-tune’ the operation. To prevent touch reports from

interfering with these commands, it is recommended

that TOUCH_DISABLE be executed prior to any other

command(s) and the TOUCH_ENABLE command be

used as the last step to return the AR1100 to normal

operation.

5.1 Summary

Table 5-1 summarizes the standard command set.

Table 5-2 summarizes the STATUS byte in the

RESPONSE packet.

TABLE 5-1: COMMAND SUMMARY

CMND NAME DESCRIPTION

0x12 TOUCH_ENABLE Enable TOUCH reporting

0x13 TOUCH_DISABLE Disable TOUCH reporting

0x14 CALIBRATE Execute Calibrate routine

0x20 REG_READ Read register(s)

0x21 REG_WRITE Write register(s)

0x28 EE_READ Read EE location(s)

0x29 EE_WRITE Write EE location(s)

0x2B EE_READ_PARAMS Read parameter set (from EE to RAM)

0x23 EE_WRITE_PARAMS Write parameter set (from RAM to EE)

TABLE 5-2: STATUS SUMMARY

STATUS NAME DESCRIPTION

0x00 OK No error

0x01 UNRECOGNIZED Unrecognized command

0x04 TIMEOUT Packet time out

0x05 EEPARAMS_ERR Error reading EEPROM parameters

0xFC CAL_CANCEL Calibration sequence cancelled

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5.2 Command: TOUCH_ENABLE

Enable touch reporting.

COMMAND PACKET:

RESPONSE PACKET:

5.3 Command: TOUCH_DISABLE

Disable touch reporting.

COMMAND PACKET:

RESPONSE PACKET:

5.4 Command: CALIBRATE

The CALIBRATE command initiates the

controller-based calibration sequence. A RESPONSE

packet is returned for each calibration point touched.

COMMAND PACKET

RESPONSE PACKET (for each calibration point

touched, then released):

5.5 Command: REG_READ

Read one or more operational registers.

COMMAND PACKET:

RESPONSE PACKET:

TABLE 5-3: COMMAND: TOUCH_ENABLE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x12 COMMAND

TABLE 5-4: RESPONSE: TOUCH_ENABLE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x02SIZE

3 STATUS STATUS

4 0x12 COMMAND

TABLE 5-5: COMMAND: TOUCH_DISABLE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x13 COMMAND

TABLE 5-6: RESPONSE: TOUCH_DISABLE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x02SIZE

3 STATUS STATUS

4 0x13 COMMAND

TABLE 5-7: COMMAND: CALIBRATE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2 0x02 BYTE COUNT

30x14COMMAND

4 TYPE 0x01: 4-Point – Full interpola-

tion

0x02: 9-Point

0x03: 25-Point

0x04: 4-Point (AR1000 style)

TABLE 5-8: RESPONSE: CALIBRATE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x02SIZE

3 STATUS STATUS

4 0x14 COMMAND

TABLE 5-9: COMMAND: REG_READ

BYTE# VALUE DESCRIPTION

10x55SYNC

20x04SIZE

30x20COMMAND

4 0x00 REGISTER ADDRESS (MSB)

5 ADR REGISTER ADDRESS (LSB)

6 N NUMBER OF BYTES TO READ

TABLE 5-10: RESPONSE: REG-READ

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2N+2SIZE

3 STATUS STATUS

4 0x20 COMMAND

5 REG[ADR] REGISTER VALUE

... ... REGISTER VALUE(S)

4+N REG[ADR+N-1] REGISTER VALUE

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

5.6 Command: REG_WRITE

Write one or more operational registers.

COMMAND PACKET:

RESPONSE PACKET:

5.7 Command: EE_READ

Read one or more bytes from EEPROM.

COMMAND PACKET:

RESPONSE PACKET:

5.8 Command: EE_WRITE

Write one or more bytes to EEPROM.

COMMAND PACKET:

RESPONSE PACKET:

TABLE 5-11: COMMAND: REG_WRITE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2 N+2 SIZE (N = # of REGS to

WRITE)

30x21COMMAND

4 0x00 REGISTER ADDRESS

(MSB)

5 ADR REGISTER ADDRESS

(LSB)

6 REG[ADR] REGISTER VALUE

... ... REGISTER VALUE(S)

5+N REG[ADR+N-1] REGISTER VALUE

TABLE 5-12: RESPONSE: REG_WRITE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x02SIZE

3STATUSSTATUS

40x21COMMAND

TABLE 5-13: COMMAND: EE_READ

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x04SIZE

30x28COMMAND

4 0x00 EE ADDRESS (MSB)

5 ADR EE ADDRESS (LSB)

6 N Number of bytes to read

TABLE 5-14: RESPONSE: EE_READ

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2 N+2 SIZE (N = # of BYTES to

WRITE)

3 STATUS STATUS

4 0x28 COMMAND

5 EE[ADR] EE VALUE

... ... EE VALUE VALUE(S)

4+N EE[ADR+N-1] EE VALUE

TABLE 5-15: COMMAND: EE_WRITE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2 4+N SIZE (N = # of REGS to

WRITE)

3 0x29 COMMAND

4 0x00 EE ADDRESS (MSB)

5 ADR EE ADDRESS (LSB)

6 EE[ADR] EE VALUE

... ... EE VALUE(S)

5+N EE[ADR+N-1] EE VALUE

TABLE 5-16: RESPONSE: EE_WRITE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0x29 COMMAND

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 24  2011 Microchip Technology Inc.

5.9 Command: EE_READ_PARAMS

Read entire set of operational parameters from

EEPROM to RAM.

COMMAND PACKET:

RESPONSE PACKET:

5.10 Command: EE_WRITE_PARAMS

Write entire set of operational parameters to EEPROM

from RAM.

COMMAND PACKET:

RESPONSE PACKET:

5.11 Command: USB_MODE_GENERIC

Set default USB mode (device type) to

“HID-GENERIC”. Mode HID-GENERIC is required for

low-level configuration commands, calibration and boot

load operations. No RESPONSE packet is returned.

COMMAND PACKET:

RESPONSE PACKET:

None.

5.12 Command: USB_MODE_MOUSE

Set default USB mode (device type) to ‘HID-MOUSE’.

COMMAND PACKET:

RESPONSE PACKET:

None.

5.13 Command: USB_MODE_DIGITIZER

Set default USB mode (device type) to ‘HID-DIGI-

TIZER’.

COMMAND PACKET:

RESPONSE PACKET:

None.

TABLE 5-17: COMMAND: EE_READ_PARAMS

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x23 COMMAND

TABLE 5-18: RESPONSE:

EE_READ_PARAMS

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0x23 COMMAND

TABLE 5-19: COMMAND:

EE_WRITE_PARAMS

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x2B COMMAND

TABLE 5-20: RESPONSE:

EE_WRITE_PARAMS

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0x2B COMMAND

TABLE 5-21: COMMAND:

USB_MODE_GENERIC

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x70 COMMAND

TABLE 5-22: COMMAND: USB_MODE_MOUSE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x71 COMMAND

TABLE 5-23: COMMAND:

USB_MODE_DIGITIZER

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x72 COMMAND

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

6.0 CONFIGURATION REGISTERS

TABLE 6-1: CONFIGURATION REGISTER SUMMARY

ADDR NAME DECRIPTION 7 6 5 4 3 2 1 0 DFLT

0x00 RisetimeCapTime-

out

*170 usec Value of: 0-255 0x18

0x01 RisetimeQuick *10 usec Value of: 0-255 0x02

0x02 TouchThreshold 8-bit ADC –

touch_check()

Value of: 0-255 0x80

0x03 SensitivityFilter 8-bit ADC Value of: 0-255 0x04

0x04 SamplingFast # of ADC samples/touch

to average

Value of: 1, 2, 4, 8, 16, 32, 64, 128 0x04

0x05 SamplingSlow # of ADC samples/touch

to average

Value of: 1, 2, 4, 8, 16, 32, 64, 128 0x08

0x06 AccuracyFilterFast # of touch positions to

average

Value of: 1-8 0x08

0x07 AccuracyFilter-

Slow

# of touch positions to

average

Value of: 1-8 0x08

0x08 SpeedThreshold 8-bit ADC (raw touch

coordinates)

Value of: 0-255 0x03

0x09 DitherFilter size of anti-dithering win-

dow 1/4096 of sensor

dim.

Value of: 0-255 0x00

0x0A SleepDelay *250 msec Value of: 0-255 0x00

0x0B PenUpDelay touch process loop count Value of: 0-255 0x02

0x0C TouchMode (Note 3) PD2 PD1 PD0 PM1 PM0 PU2 PU1 PU0 0xB1

0x0D TouchOptions (Note 1) TEN VCF — C DRT — 48W CALE 0x89

0x0E CalibrationInset 2x % sensor dimension -

units: 1/256 (e.g.

64=25%)

Value of: 1-128 0x40

0x0F PenStateReport-

Delay

*170 usec Value of: 0-255 0x04

0x10 Reserved — — 0x00

0x11 TouchReportDelay *0.5 msec Value of: 0-255 0x00

0x12 RisetimeDefault *21 usec Value of: 0-255 0x80

0x13 RisetimeModifier (value-128) * 10 usec

(i.e., 128 = 0, 127 = -1,

129 = +10)

Value of: 0-255 0x80

0x14 Status (Note 2) TCH

EEV CALV JMP DRT 8W 5W 4W 0x00

0x15 Debug (Note 4) ———RTRTCRTR——0x00

Note 1: OPTIONS/FLAGS: TEN (Touch Enable); VCF (Verbose Cal Feedback); DRT (Dynamic Risetime Enable);

48W (0 = 4-Wire, 1 = 8-Wire); CALE (Calibration Enable);

2: STATUS (READ ONLY): TCHK (Result of Touch CHK DIAG); EEV (Params in EEPROM used); CALV

(Calibration valid); JMP (State of mode Jumper); DRT (DYN RISE TIME CAP MEAS’D); 8W (Configured

for 8W Sensor); 5W (Configured for 5W Sensor); 4W (Configured for 4W Sensor);

3: TOUCH MODE(S) (specified for each event: PD, PM and PU): 0: no report(s) issued; 1: report (P = 0); 2:

report (P = 1); 3: report (P = 1), report (P = 0); 4: report (P = 0), report (P = 1); report (P = 0), 5: report (P

= 0), report (P = 1);

4: DEBUG FLAGS (optional): RT (Risetime Report); RTC (Risetime CAP Report); RTR (Risetime RES

Report).

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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6.1 Register 0: RisetimeCapTimeout

(ADVANCED – DO NOT CHANGE)

The RisetimeCapTimeout value is used in the

proprietary algorithm associated with sensor

characteristics.

6.2 Register 1: RisetimeQuick

(ADVANCED – DO NOT CHANGE)

The RisetimeQuick value is used in the proprietary

algorithm associated with sensor characteristics.

6.3 Register 2: TouchThreshold

The TouchThreshold value sets the threshold for

detecting a touch condition. A larger value relaxes the

criteria for detecting a touch and a small value is more

demanding.

6.4 Register 3: SensitivityFilter

The SensitivityFilter value sets a criteria for touch

‘stability’. A larger value is more sensitive to a touch but

possibly less ‘stable’. A smaller value requires a

‘harder’ touch but provides a more stable position.

6.5 Register 4: SamplingFast

The SamplingFast register sets the level of touch

measurement sample averaging, when touch

movement is determined to be fast (reference

SpeedThreshold). A lower value will result in faster

reporting but may be more susceptible to noise in touch

positions. A higher value will reduce the report rate but

provide more immunity to random noise in the reported

touch positions.

6.6 Register 5: SamplingSlow

The SamplingFast register sets the level of touch

measurement sample averaging, when touch

movement is determined to be slow (reference

SpeedThreshold). A lower value will result in faster

reporting but may be more susceptible to noise in touch

positions. A higher value will reduce the report rate but

provide more immunity to random noise in the reported

touch positions.

6.7 Register 6: AccuracyFilterFast

The AccuracyFilterFast sets the level of touch

measurement accuracy enhancement used when the

touch movement is determined to be ‘fast’ (reference

SpeedThreshold). A lower value will increase touch

position resolution but may exhibit more noise in

reported touch positions. A higher value will decrease

touch position resolution but increase immunity to

noise in reported touch positions.

6.8 Register 7: AccuracyFilterSlow

The AccuracyFilterFast sets the level of touch

measurement accuracy enhancement used when the

touch movement is determined to be ‘slow’ (reference

SpeedThreshold). A lower value will increase touch

position resolution but may exhibit more noise in

reported touch positions. A higher value will decrease

touch position resolution but increase immunity to

noise in reported touch positions.

6.9 Register 8: SpeedThreshold

The SpeedThreshold value sets the threshold for touch

movement to be considered as ‘slow’ or ‘fast’. A lower

value reduces the touch movement speed that will be

considered ‘fast’. A higher value has the opposite

effect.

6.10 Register 9: DitherFilter

The DitherFilter value sets the threshold to prevent the

reported touch location from changing during what is

thought to be a stationary touch. The computed touch

position must change by an amount greater than Dith-

erFilter (either X or Y) before the reported position

changes.

6.11 Register 10: SleepDelay

The SleepDelay value sets the time interval (with no

touch or host communication) that will cause the

AR1100 to enter a low-power Sleep mode (UART

Communication mode only).

6.12 Register 11: PenUpDelay

The PenUpDelay sets the time required for a pen-up

event/condition before the controller will send a touch

report with a pen-up status – effectively debouncing

pen up. The delay timer resets if a pen-down condition

is detected before the timer expires. A lower value will

increase the responsiveness of the controller to pen up.

A higher value will decrease the responsiveness.

 2011 Microchip Technology Inc. DS41606B-page 27

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

6.13 Register 12: TouchMode

The TouchMode value defines the action taken by the

controller in response to the three touch events/states

(i.e., (1) pen down, (2) pen movement and (3) pen up).

A code is specified for each event to specify one of 6

predefined actions. As can be seen in the footnotes of

Table 6-1, several actions specify a sequence of

multiple touch reports. Each report in a multiple-touch

sequence can be spaced in time by parameter

PenStateReportDelay.

6.14 Register 13: TouchOptions

The TouchOptions register contains several bit flags

corresponding to options in operation.

TouchMode[7:5] = PD[2:0] Response to event PD (PEN DOWN)

b000 No touch report issued in response to the event

b001 Touch report w/ P=0

b010 Touch report w/ P=1

b011 Touch report w/ P=1, then Touch report w/ P=0

b100 Touch report w/ P=0, then Touch report w/ P=1, then Touch report w/ P=0

b101 Touch report w/ P=0, then Touch report w/ P=1

TouchMode[4:3] = PM[1:0] Response to event PM (PEN MOVEMENT)

b000 No touch report issued in response to the event

b001 Touch report w/ P=0

b010 Touch report w/ P=1

TouchMode[2:0] = PU[2:0] Response to event PU (PEN UP)

b000 No touch report issued in response to the event

b001 Touch report w/ P=0

b010 Touch report w/ P=1

b011 Touch report w/ P=1, then Touch report w/ P=0

b100 Touch report w/ P=0, then Touch report w/ P=1, then Touch report w/ P=0

b101 Touch report w/ P=0, then Touch report w/ P=1

TouchOptions[7:7] 1: Set TOUCH_ENABLE as the default power-up state

TouchOptions[6:6] 1: Enable verbose mode for calibration feedback

TouchOptions[3:3] 1: Enable proprietary dynamic rise time algorithm

TouchOptions[1:1] 1: Select 8W, 0: Select 4W (if MODE input = VDD)

TouchOptions[0:0] 1: Enable ‘calibrated’ touch reports, 0: Enable ‘raw’ touch reports

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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6.15 Register 14: CalibrationInset

The CalibrationInset value specifies the ‘inset’ (margin)

from the edge of the sensor to the perimeter calibration

points. The remaining calibration points (for 9P and

25P) are evenly spaced between the margins. The

inset is in units of 1/256 of the sensor dimension(s) and

is 2x the margin – e.g. a value of 64 is 64/256ths of the

screen dimension (25%) – each margin (top, bottom,

left, right) is 12.5%.

6.16 Register 15: PenStateReportDelay

The PenStateReportDelay value sets the time delay

between successive touch reports in a multiple-report

sequence called for by TouchModes.

6.17 Register 17: TouchReportDelay

The TouchReportDelay value sets the time delay

between successive touch reports. This can be used to

reduce the volume/speed of touch reports, thereby

reducing the burden on the host to process the touch

reports.

6.18 Register 18: RisetimeDefault

(ADVANCED – DO NOT CHANGE)

The RisetimeModifier value is used in the proprietary

algorithm measuring and reacting to sensor

characteristic(s).

6.19 Register 19: RisetimeModifier

(ADVANCED – DO NOT CHANGE)

The RisetimeModifier value is used in the proprietary

algorithm measuring and reacting to sensor

characteristic(s).

6.20 Register 20: Status

The STATUS register provides useful feedback to the

host on AR1100 operational status.

6.21 Register 21: Debug

The Debug register contains bit flags enabling various

debug functions.

Status[7:7] TCHK Result of touch check diagnostic

Status[6:6] EEV Parameters in EEPROM were valid and automatically loaded

Status[5:5] CALV Calibration valid (EEPROM contains valid cal coefficients)

Status[4:4] JMP State of mode input 1: open (jumper off), 0: grounded (jumper on)

Status[3:3] DRT Dynamic risetime CAP successfully measured

Status[2:2] 8W Configured for 8W sensor (4W will also be set)

Status[1:1] 5W Configured for 5W sensor

Status[0:0] 4W Configured for 4W sensor

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AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

7.0 OPERATION

7.1 Configuration

The AR1100 is operational out of the box using factory

defaults. Some applications may have special needs

that require changes to those factory settings (parame-

ter registers). This is easily accomplished using the

commands described in Section 5.0, Commands. The

recommended procedure is as follows:

1. Issue command: TOUCH_DISABLE (disables

touch reports so as not to interfere)

2. Issue command: REG_WRITE, as needed, to

modify the value of selected parameter registers

3. Issue command: EE_WRITE_PARAMS (optional)

to archive new register values as ‘defaults’

4. Issue command: TOUCH_ENABLE (to re-enable

touch reports)

7.2 Calibration

7.2.1 INTRODUCTION

Calibration enables the AR1100 to issue touch reports

that (1) correct/modify sensor orientation and (2) pre-

cisely map the reported touch location to the physical

dimensions of the underlying display device. The

AR1100 has the option of either reporting RAW touch

reports or utilizing calibration information to report CAL-

IBRATED touch reports. Configuration register,

“TouchOption”, contains bit flag “CALE” (calibration

enable) to choose between the two.

The calibration process requires the operator to

sequentially touch a series of targets [crosshairs] pre-

sented by the host on the display device. The AR1100

archives the raw-touch data from each calibration

touch point in EEPROM, then uses that data in normal

operation to process “raw” data into “calibrated” data.

7.2.2 CONFIGURATION

Both the host and device must know/understand the

geometry of the calibration point matrix. The AR1100

defines the matrix by (1) an INSET and (2) calibration

TYPE i.e., number of points (4, 9 or 25). The TYPE is

set by the argument of the calibration command. The

INSET is pre-defined by the Configuration register

CalibrationInset.

The INSET is predefined as ‘64’ – interpreted as 64/

256 (i.e., 25%) of the sensor width or height. This

defines the ‘margin’ on the perimeter of the calibration

point matrix. Interior calibration points are spaced

equally between the margins (e.g., for the 9-point cali-

bration in the illustration – point 2 is half-way between

points 1 and 3). See Figure 7-1.

FIGURE 7-1: CALIBRATION POINT LAYOUT

Note: Configuration commands are supported

only in UART and HID-GENERIC

communication modes. Refer to

Section 7.6, USB Mode Change.

Note: Calibration is supported only in UART and

HID-GENERIC communication modes.

Refer to Section 7.6, USB Mode Change.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 30  2011 Microchip Technology Inc.

7.2.3 EXECUTION

The host first commands the AR1100 to enter

Calibration mode, then subsequently presents the

calibration point targets, one at a time, from left to right,

top to bottom. The AR1100 returns a calibration

command response packet each time the operator

touches a target – signaling the host to proceed. Upon

completion, the data from the calibration process is

saved to EEPROM and available for use by the

AR1100 during normal operation. Calibration process

can be aborted by the host by simply issuing any

command. That command will be ignored but the

response to that command will have a status byte that

indicates that calibration had terminated prematurely

(see below).

7.2.3.1 Normal sequence

• host issues calibration command: <0x55>

<0x02> <0x14> <type>

• host present 1st target

• operator touches (and releases) sensor at 1st

target

• device issues response packet: <0x55> <0x02>

<0x00> <0x14>

• host presents 2nd target

• operator touches (and releases) sensor at 2nd

target

• device issues response packet: <0x55> <0x02>

<0x00> <0x14>

•…

• host presents last target

• operator touches (and releases) sensor at last

target

• device issues response packet: <0x55> <0x02>

<0x00> <0x14>

• host terminates the target display

• device returns to normal operation

7.2.3.2 Aborted sequence

• host issues calibration command: <0x55>

<0x02> <0x14> <type>

• host presents 1st target

• operator touches (and releases) sensor at 1st

target

• device issues response packet: <0x55> <0x02>

<0x00> <0x14>

• host presents 2nd target

• operator touches (and releases) sensor at 2nd

target

• device issues response packet: <0x55> <0x02>

<0x00> <0x14>

•host issues TOUCH_ENABLE command to abort

calibration: <0x55> <0x01> <0x12>

• device issues response packet: <0x55> <0x02>

<0xFC> <0x12>

• (status 0xFC indicates calibration termination)

• host terminates the target display

• device returns to normal operation

7.2.3.3 Normal sequence (verbose)

The VCF (Verbose Calibration Feedback) bit in the

TouchOptions Configuration register enables ‘verbose’

communication from the AR1100 in Calibration mode

as evidenced below:

• host sets ‘verbose’ flag in Configuration register

i.e., TouchOptions[VCF]

• host issues calibration command: <0x55>

<0x02> <0x14> <type>

• device responds: <0x55> <0x07> <0x00>

<0x14> <0xFE> <0xXX> <0xXX> <0xYY>

<0xYY>

0xFE indicates ‘enter’ Calibration mode, XX and YY are

don’t care.

• host presents 1st target

• operator touches (and releases) sensor at 1st

target

• device issues response packet: <0x55> <0x07>

<0x00> <0x14> <0x00> <0xXX> <0xXX>

<0xYY> <0xYY>

•the 5

th byte indicates the calibration point 0x00

(the 1st)

0xXXXX and 0xYYYY are RAW coordinates of the

touch point (16-bit, little endian)

• host presents 2nd target

• operator touches (and releases) sensor at 2nd

target

• device issues response packet: <0x55> <0x07>

<0x00> <0x14> <0x01> <0xXX> <0xXX>

<0xYY> <0xYY>

•The 5

th byte indicates the calibration point 0x01

(the 2nd)

0xXXXX and 0xYYYY are RAW coordinates of the

touch point (16-bit, little endian)

…

 2011 Microchip Technology Inc. DS41606B-page 31

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

• host presents last target (9th in this example)

• operator touches (and releases) sensor at last tar-

get <0x55> <0x07> <0x00> <0x14> <0x08>

<0xXX> <0xXX> <0xYY> <0xYY>

•the 5

th byte indicates the calibration point 0x08

(the 9th)

•0xXXXX and 0xYYYY are RAW coordinates of the

touch point (16-bit, little endian)

• device indicates exit from calibration mode with

<0x55> <0x07> <0x00> <0x14> <0xFF>

<0xXX> <0xXX> <0xYY> <0xYY>

0xFF indicates ‘exit’ Calibration mode, XX and YY are

don’t care

• host terminates the target display

• device returns to normal operation

7.3 Sleep

The AR1100 supports a low-power, Sleep mode used

to conserve power when the device is not in use.

When in UART Communication mode, Sleep mode is

activated after a specified time interval (parameter reg-

ister: SleepDelay) during which no touch or communi-

cation took place. When in Sleep, the device can be

awakened by a touch or by any communication from

the host. The first byte of communication used to wake

up the device will be lost/ignored.

When in USB Communication mode, Sleep mode is

activated by a USB SUSPEND control transfer from the

host – the SleepDelay timer has no effect. Optionally, if

the host is configured to allow the device to awaken the

host (USB REMOTE WAKE-UP), the host will preface

the USB SUSPEND with a control transfer to enable

remote wake-up from the device. In this situation, a

touch can awaken the host; otherwise, only a RESUME

condition from the host will wake-up the AR1100.

7.4 Configure Sensor Type

The AR1100 must be configured for the sensor type

connected (i.e., 4W, 5W or 8W) using a combination of

the MODE input pin and configuration parameter

TouchOptions. For a 5W sensor, the mode input pin

must be grounded. For a 4W or 8W sensor, the mode

input pin should be open/disconnected. Additionally, bit

1 in Configuration register TouchOptions is used to

further select between 4W and 8W.

As seen in FIGURE B-1: “Schematic”, the MODE pin

is typically connected to a hardware jumper (J1).

Because this pin is equipped with an internal pull-up

resistor, it can be grounded with a jumper or simply left

disconnected (no jumper).

7.5 LED

The LED provides an indication of controller status. As

summarized in Tab le 7 -1, a ‘fast’ blink indicates that a

touch is detected, and a ‘slow’ blink indicates no touch.

FIGURE 7-2: LED SCHEMATIC

7.6 USB Mode Change

Low-level operations (configuration, calibration, boot

load) are supported in only 2 of the 4 communication

modes (i.e., UART and HID-GENERIC). If the AR1100

is operating in HID-MOUSE or HID-DIGITIZER mode,

it must be configured to HID-GENERIC for the low-level

operations, then reconfigured back to the desired

(default) device type.

Three 3-byte commands are provided to assign the

USB device type (refer to Section 5.0, Commands).

1. USB_MODE_GENERIC

2. USB_MODE_MOUSE

3. USB_MODE_DIGITIZER

Each command sets the default USB device type (in

nonvolatile memory), then resets the AR1100 – caus-

ing it to re-enumerate. All three device types will accept

the mode change commands as either a

SET_FEATURE control transfer or a standard WRITE

data transfer (via the interrupt-end point). The HID-

MOUSE device under MS Windows® may be limited to

SET_FEATURE only.

TABLE 7-1: LED INDICATOR

Behavior Status

LED blinks slowly

(once per second)

Controller is powered, awake

and no touch is detected

LED blinks rapidly (5

times per second)

Controller detects a touch

LED is off Controller has no power or is

asleep (suspended)

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

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NOTES:

 2011 Microchip Technology Inc. DS41606B-page 33

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

8.0 BOOT LOADER

The boot load process and associated commands

enables the host to reprogram the AR1100. Because

the size of the Flash program memory cannot accom-

modate both a boot load section and application sec-

tion, the AR1100 is programmed in sections using 3

passes. With each pass, a USB device will necessarily

re-enumerate. Passes:

1. Program temporary boot load application into

upper memory

2. Execute from temporary boot load application to

program the lower half of the new application

3. Execute from the lower half of the new applica-

tion to program the upper half

This process is illustrated in a more detail in Figure 8-1

below.

FIGURE 8-1: BOOT LOADING SEQUENCE

Note: The boot load operation is supported only

in UART and HID-GENERIC

communication modes. Refer to

Section 7.6, USB Mode Change.

Note: A stand-alone software utility is available

from Microchip to facilitate the boot

loading operation. This functionality is

also available with the Microchip AR

Configuration Utility.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 34  2011 Microchip Technology Inc.

8.1 Command Summary

The boot load operation uses the same data format/

protocol as the touch application. Commands are

described below.

STATUS code(s) returned in RESPONSE packet.

8.2 Command: VERSION

Request firmware version packet – includes Boot

mode.

COMMAND PACKET:

RESPONSE PACKET:

8.3 Command: RESET

Execute a device Reset. If in USB mode, the device will

detach from the bus and re-enumerate.

COMMAND PACKET:

RESPONSE PACKET:

None.

TABLE 8-1: COMMAND SUMMARY

CMND NAME DESCRIPTION

0x01 VERSION Return version number and mode

0xF0 RESET Software device Reset

0xF1 INIT Initialize boot loader

0xF2 WRITE Write-memory contents

0xF3 READ Read-memory contents

0xF4 FLUSH Flush Flash cache

0xF5 WRITE_MODE Write nonvolatile BOOT mode value

TABLE 8-2: COMMAND STATUS SUMMARY

CODE NAME DESCRIPTION

0x00 OK No error

0x01 BAD PACKET Packet was malformed, unrecognized or timed out

TABLE 8-3: COMMAND: VERSION

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0x01 COMMAND

TABLE 8-4: RESPONSE: VERSION

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x06 SIZE

3 STATUS STATUS

40x01 COMMAND

6 VER_MAJOR VERSION (Major)

7 VER_MINOR VERSION (Minor)

8 VER_REV VERSION (Revision – inter-

nal)

9 MODE Boot mode

0: Normal

1: Write boot – upper Flash

2: Write application – lower

3: Write application – upper

TABLE 8-5: COMMAND: RESET

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0xF0 COMMAND

 2011 Microchip Technology Inc. DS41606B-page 35

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

8.4 Command: INIT

Initialize the boot load process – executed as the first

step after Reset.

COMMAND PACKET:

RESPONSE PACKET:

8.5 Command: WRITE

The WRITE command facilitates programming Flash or

EEPROM. The Most Significant Byte of the 24-bit

address in the WRITE command dictates the destina-

tion. The AR1100 maps Flash to 0x000000 and

EEPROM, to 0xF00000.

COMMAND PACKET:

RESPONSE PACKET:

8.6 Command: READ

Read from device Flash or EEPROM.

REMINDER: Flash data will be encrypted while

EEPROM data will not be encrypted.

COMMAND PACKET:

RESPONSE PACKET:

TABLE 8-6: COMMAND: INIT

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0xF1 COMMAND

TABLE 8-7: RESPONSE: INIT

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0xF1 COMMAND

TABLE 8-8: COMMAND: WRITE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2 N+4 SIZE (N = # of data bytes

to write)

30xF2COMMAND

4 ADDR 07:00 ADDRESS

5 ADDR 15:08

6 ADDR 23:16

7 [DATA 1] DATA (to be written)

... ...

N+6 [DATA N]

TABLE 8-9: RESPONSE: WRITE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0xF2 COMMAND (WRITE)

TABLE 8-10: COMMAND: READ

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x05SIZE

3 0xF3 COMMAND

4 ADDR 07:00 ADDRESS

5 ADDR 15:08

6 ADDR 23:16

7 N # Bytes to Read

TABLE 8-11: RESPONSE: READ

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

2 N+2 SIZE (N = # of data bytes

to read)

3 STATUS STATUS

4 0xF3 COMMAND

5[DATA 1]

6...

7 [DATA N]

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 36  2011 Microchip Technology Inc.

8.7 Command: FLUSH

The FLUSH command is required to write/flush any

data remaining in the internal cache at the end of a boot

load session.

COMMAND PACKET:

RESPONSE PACKET:

8.8 Command: WRITE_MODE

The WRITE_MODE command is used to change the

operational mode of the bootloader. The four modes

are described in Ta b l e 8 - 1 6 .

COMMAND PACKET:

RESPONSE PACKET:

The boot load “MODE CODE” (referenced above) is a

1-byte value saved in nonvolatile memory to indicate

boot status.

TABLE 8-12: COMMAND: FLUSH

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x01SIZE

3 0xF4 COMMAND

TABLE 8-13: RESPONSE: FLUSH

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0xF4 COMMAND

TABLE 8-14: COMMAND: WRITE_MODE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

20x05SIZE

3 0xF5 COMMAND

4n/a

5n/a

6n/a

7 M 1_Byte mode Code

TABLE 8-15: RESPONSE: WRITE_MODE

BYTE# VALUE DESCRIPTION

1 0x55 SYNC

22SIZE

3 STATUS STATUS

4 0xF5 COMMAND

TABLE 8-16: WRITE_MODE CODES

Value Description

0x00 Normal mode (application)

0x01 Programming/Flashing ‘upper’ application

0x02 Programming/Flashing ‘lower’ application

0x03 Programming/Flashing temporary ‘boot’

module

 2011 Microchip Technology Inc. DS41606B-page 37

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

9.0 EEPROM MAP

TABLE 9-1: EEPROM MAP

ADDR(D) ADDR(D) Value Description

USER

000

USER User-defined area

... ...

95 5F

PARAMETERS

96 60 0x55 HEADER – PARAMETER BLOCK

97 61 RisetimeCapTimeout

98 62 RisetimeQuick

99 63 TouchThreshold

100 64 SensitivityFilter

101 65 SamplingFast

102 66 SamplingSlow

103 67 AccuracyFilterFast

104 68 AccuracyFilterSlow

105 69 SpeedThreshold

106 6A DitherFilter

107 6B SleepDelay

108 6C PenUpDelay

109 6D TouchMode

110 6E TouchOptions

111 6F CalibrationInset

112 70 PenStateReportDelay

113 71 n/a

114 72 TouchReportDelay

115 73 RisetimeDefault

116 74 RisetimeModifier

117 75 Status

118 76 Debug

CALIBRATION

119 77

NOT USED NOT USED

... ...

127 7F

128 80 0x55 HEADER – CALIBRATION DATA BLOCK

129 81 flags bit flags

130 82 nx number of calibration point on X axis

131 83 ny number of calibration point on Y axis

132 84 inset inset

133 85 type calibration type

134 86 nx_offset[0] calculated 16-bit calibration point offset – xaxis

135 87

136 88 nx_offset[1] calculated 16-bit calibration point offset – xaxis

137 89

138 8A nx_offset[2] calculated 16-bit calibration point offset – xaxis

139 8B

140 8C nx_offset[3] calculated 16-bit calibration point offset – xaxis

Note 1: Locations 0xFE, 0xFF are off-limits and should not be overwritten.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 38  2011 Microchip Technology Inc.

141 8D

142 8E nx_offset[4] calculated 16-bit calibration point offset – xaxis

143 8F

144 90 ny_offset[0] calculated 16-bit calibration point offset – yaxis

145 91

146 92 ny_offset[1] calculated 16-bit calibration point offset – yaxis

147 93

148 94 ny_offset[2] calculated 16-bit calibration point offset – yaxis

149 95

150 96 ny_offset[3] calculated 16-bit calibration point offset – yaxis

151 97

152 98 ny_offset[4] calculated 16-bit calibration point offset – yaxis

153 99

154 9A xy [0,0] calibration point 0, X ordinate (16 bit)

155 9B

156 9C xy [1,0] calibration point 0, Y ordinate (16 bit)

157 9D

158 9E xy [0,1] calibration point 1, X ordinate (16 bit)

159 9F

160 A0 xy [1,1] calibration point 1, Y ordinate (16 bit)

161 A1

162 A2

... calibration point(s)

... ...

249 F9

250 FA xy [24,1] calibration point 24, X ordinate (16 bit)

251 FB

252 FC xy [24,1] calibration point 24, Y ordinate (16 bit)

253 FD

254 FE usb_mode USB MODE (GENERIC, MOUSE, DIGITIZER)

255 FF boot_mode BOOT MODE (0 = NORMAL/NON-BOOT)

TABLE 9-1: EEPROM MAP (CONTINUED)

ADDR(D) ADDR(D) Value Description

Note 1: Locations 0xFE, 0xFF are off-limits and should not be overwritten.

 2011 Microchip Technology Inc. DS41606B-page 39

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

10.0 ELECTRICAL SPECIFICATIONS

Absolute Maximum Ratings(†)

Ambient temperature under bias......................................................................................................... -40°C to +85°C

Storage temperature ........................................................................................................................ -65°C to +150°C

Voltage on VDD with respect to VSS .................................................................................................... -0.3V to +6.5V

Voltage on all other pins with respect to VSS ........................................................................... -0.3V to (VDD + 0.3V)

Total power dissipation................................................................................................................................... 800 mW

Maximum current out of VSS pin .................................................................................................................... 300 mA

Maximum current into VDD pin ....................................................................................................................... 250 mA

Input clamp current (VI < 0 or VI > VDD)20 mA

Maximum output current sunk by any I/O pin.................................................................................................... 25 mA

Maximum output current sourced by any I/O pin .............................................................................................. 25 mA

† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional operation of the device at those or any other conditions above those

indicated in the operation listings of this specification is not implied. Exposure above maximum rating conditions for

extended periods may affect device reliability.

† NOTICE: This device is sensitive to ESD damage and must be handled appropriately. Failure to properly handle

and protect the device in an application may cause partial to complete failure of the device.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 40  2011 Microchip Technology Inc.

NOTES:

 2011 Microchip Technology Inc. DS41606B-page 41

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

11.0 PACKAGING INFORMATION

11.1 Package Marking Information

*Standard PICmicro® device marking consists of Microchip part number, year code, week code and

traceability code. For PICmicro device marking beyond this, certain price adders apply. Please check

with your Microchip Sales Office. For QTP devices, any special marking adders are included in QTP

price.

Legend: XX...X Customer-specific information

Y Year code (last digit of calendar year)

YY Year code (last 2 digits of calendar year)

WW Week code (week of January 1 is week ‘01’)

NNN Alphanumeric traceability code

Pb-free JEDEC designator for Matte Tin (Sn)

*This package is Pb-free. The Pb-free JEDEC designator ( )

can be found on the outer packaging for this package.

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line, thus limiting the number of available

characters for customer-specific information.

20-Lead SSOP (5.30 mm) Example

20-Lead SOIC (7.50 mm) Example

XXXXXXXXXXXX

YYWWNNN

XXXXXXXXXXXX

20-Lead QFN (5x5x0.9 mm) Example

PIN 1PIN 1

AR1100

I/SS

AR1100

I/SO

AR1100

I/MQ

1042256

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 42  2011 Microchip Technology Inc.

11.2 Ordering

TABLE 11-1: ORDERING PART NUMBERS

Part Number Temperature Range Package Packing

AR1100-I/SS -40°C to +85°C SSOP, 20 pins Tube

AR1100T-I/SS -40°C to +85°C SSOP, 20 pins T/R

AR1100-I/SO -40°C to +85°C SOIC, 20 pins Tube

AR1100T-I/SO -40°C to +85°C SOIC, 20 pins T/R

AR1100-I/MQ -40°C to +85°C QFN, 20 pins Tube

AR1100T-I/MQ -40°C to +85°C QFN, 20 pins T/R

 2011 Microchip Technology Inc. DS41606B-page 43

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

11.3 Package Details

The following sections give the technical details of the packages.

/HDG3ODVWLF6KULQN6PDOO2XWOLQH66±PP%RG\>6623@

1RWHV

 3LQYLVXDOLQGH[IHDWXUHPD\YDU\EXWPXVWEHORFDWHGZLWKLQWKHKDWFKHGDUHD

 'LPHQVLRQV'DQG(GRQRWLQFOXGHPROGIODVKRUSURWUXVLRQV0ROGIODVKRUSURWUXVLRQVVKDOOQRWH[FHHGPPSHUVLGH

 'LPHQVLRQLQJDQGWROHUDQFLQJSHU$60(<0

%6& %DVLF'LPHQVLRQ7KHRUHWLFDOO\H[DFWYDOXHVKRZQZLWKRXWWROHUDQFHV

5() 5HIHUHQFH'LPHQVLRQXVXDOO\ZLWKRXWWROHUDQFHIRULQIRUPDWLRQSXUSRVHVRQO\

1RWH )RUWKHPRVWFXUUHQWSDFNDJHGUDZLQJVSOHDVHVHHWKH0LFURFKLS3DFNDJLQJ6SHFLILFDWLRQORFDWHGDW

KWWSZZZPLFURFKLSFRPSDFNDJLQJ

8QLWV 0,//,0(7(56

'LPHQVLRQ/LPLWV 0,1 120 0$;

1XPEHURI3LQV 1 

3LWFK H %6&

2YHUDOO+HLJKW $ ± ± 

0ROGHG3DFNDJH7KLFNQHVV $   

6WDQGRII $  ± ±

2YHUDOO:LGWK (   

0ROGHG3DFNDJH:LGWK (   

2YHUDOO/HQJWK '   

)RRW/HQJWK /   

)RRWSULQW / 5()

/HDG7KLFNQHVV F  ± 

)RRW$QJOH   

/HDG:LGWK E  ± 

A2 c

NOTE 1

0LFURFKLS 7HFKQRORJ\ 'UDZLQJ &%

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 44  2011 Microchip Technology Inc.

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

 2011 Microchip Technology Inc. DS41606B-page 45

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 46  2011 Microchip Technology Inc.

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

 2011 Microchip Technology Inc. DS41606B-page 47

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 48  2011 Microchip Technology Inc.

20-Lead Plastic Quad Flat, No Lead Package (MQ)  5x5x0.9 mm Body [QFN]

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

Microchip Technology Drawing C04-120A

 2011 Microchip Technology Inc. DS41606B-page 49

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 50  2011 Microchip Technology Inc.

NOTES:

 2011 Microchip Technology Inc. DS41606B-page 51

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

APPENDIX A: DATA SHEET

REVISION HISTORY

Revision A (08/2011)

Original release of this data sheet.

Revision B (11/2011)

Updated schematic.

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 52  2011 Microchip Technology Inc.

APPENDIX B:

FIGURE B-1: SCHEMATIC

FIGURE B-2: BILL OF MATERIALS

Note: ESD protection diodes are recommended for all active sensor lines but care should be taken to minimize

capacitance. As an example, PESD5V0S1BA is recommended and used on reference designs due to its

nominally-low 35 pF.

Note: Unused SENSOR pins should be grounded.

 2011 Microchip Technology Inc. DS41606B-page 53

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

INDEX

Absolute Maximum Ratings ................................................ 39

Boot Loader ........................................................................ 33

Calibration ........................................................................... 29

COMMAND

CALIBRATE ................................................................ 22

EE_READ ................................................................... 23

EE_READ_PARAMS .................................................. 24

EE_WRITE.................................................................. 23

EE_WRITE_PARAMS ................................................ 24

REG_READ ................................................................ 22

REG_WRITE............................................................... 23

USB_MODE_DIGITIZER ............................................ 24

USB_MODE_GENERIC ............................................. 24

USB_MODE_MOUSE................................................. 24

Command

FLUSH ........................................................................ 36

INIT ............................................................................. 35

READ .......................................................................... 35

RESET ........................................................................ 34

TOUCH_DISABLE ...................................................... 22

TOUCH_ENABLE ....................................................... 22

VERSION.................................................................... 34

WRITE ........................................................................ 35

WRITE_MODE............................................................ 36

Command Packets.............................................................. 17

Command Summary ........................................................... 34

Commands.......................................................................... 21

Communication ............................................................... 3, 13

Configuration....................................................................... 29

Configuration Registers ...................................................... 25

Configure Sensor Type ....................................................... 31

Customer Change Notification Service ............................... 55

Customer Notification Service............................................. 55

Customer Support ............................................................... 55

Data Protocol ...................................................................... 14

Device Overview ................................................................... 5

EEPROM Map .................................................................... 37

Electrical Specifications ...................................................... 39

Errata .................................................................................... 4

ESD Considerations............................................................ 11

Hardware .............................................................................. 9

Implementation - Quick Start ................................................ 7

Internet Address.................................................................. 55

LED ..................................................................................... 31

Microchip Internet Web Site................................................ 55

Migrating from other PIC Microcontroller Devices .............. 52

Mode

HID-DIGITIZER .......................................................... 17

HID-MOUSE ............................................................... 14

UART, HID-GENERIC ................................................ 14

Mode Detect/Select ............................................................ 13

Noise Considerations.......................................................... 11

Operation ............................................................................ 29

Overview............................................................................... 5

Packaging........................................................................... 41

Marking....................................................................... 41

PDIP Details ............................................................... 43

Physical .............................................................................. 13

Power Requirements ............................................................ 3

Reader Response............................................................... 56

Revision History.................................................................. 51

Schematic............................................................................. 9

Sensor Attachment ............................................................. 10

Sleep .................................................................................. 31

Special Features................................................................... 3

Touch Modes ........................................................................ 3

Touch Reports .................................................................... 14

Touch Resolution.................................................................. 3

Touch Sensor Support.......................................................... 3

UART Mode........................................................................ 13

USB Mode .......................................................................... 14

USB Mode Change............................................................. 31

WWW Address ................................................................... 55

WWW, On-Line Support ....................................................... 4

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 54  2011 Microchip Technology Inc.

NOTES:

 2011 Microchip Technology Inc. DS41606B-page 55

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

THE MICROCHIP WEB SITE

Microchip provides online support via our WWW site at

www.microchip.com. This web site is used as a means

to make files and information easily available to

customers. Accessible by using your favorite Internet

browser, the web site contains the following

information:

•Product Support – Data sheets and errata,

application notes and sample programs, design

resources, user’s guides and hardware support

documents, latest software releases and archived

software

•General Technical Support – Frequently Asked

Questions (FAQ), technical support requests,

online discussion groups, Microchip consultant

program member listing

•Business of Microchip – Product selector and

ordering guides, latest Microchip press releases,

listing of seminars and events, listings of

Microchip sales offices, distributors and factory

representatives

CUSTOMER CHANGE NOTIFICATION

SERVICE

Microchip’s customer notification service helps keep

customers current on Microchip products. Subscribers

will receive e-mail notification whenever there are

changes, updates, revisions or errata related to a

specified product family or development tool of interest.

To register, access the Microchip web site at

www.microchip.com. Under “Support”, click on

“Customer Change Notification” and follow the

registration instructions.

CUSTOMER SUPPORT

Users of Microchip products can receive assistance

through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

Customers should contact their distributor,

representative or field application engineer (FAE) for

support. Local sales offices are also available to help

customers. A listing of sales offices and locations is

included in the back of this document.

Technical support is available through the web site

at: http://microchip.com/support

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

DS41606B-page 56  2011 Microchip Technology Inc.

READER RESPONSE

It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip

product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our

documentation can better serve you, please FAX your comments to the Technical Publications Manager at

(480) 792-4150.

Please list the following information, and use this outline to provide us with your comments about this document.

TO: Technical Publications Manager

RE: Reader Response

Total Pages Sent ________

From: Name

Company

Address

City / State / ZIP / Country

Telephone: (_______) _________ - _________

Application (optional):

Would you like a reply? Y N

Device: Literature Number:

Questions:

FAX: (______) _________ - _________

DS41606BAR1100 Resistive USB and RS-232 Touch Screen Controller

1. What are the best features of this document?

2. How does this document meet your hardware and software development needs?

3. Do you find the organization of this document easy to follow? If not, why?

4. What additions to the document do you think would enhance the structure and subject?

5. What deletions from the document could be made without affecting the overall usefulness?

6. Is there any incorrect or misleading information (what and where)?

7. How would you improve this document?

 2011 Microchip Technology Inc. DS41606B-page 57

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO. X/XX XXX

PatternPackageTemperature

Range

Device

Device: AR1100: Resistive USB and RS-232 Touch Screen

Controller

AR1100T: Resistive USB and RS-232 Touch Screen

Controller (Tape and Reel)

Temperature

Range:

I= -40C to +85C (Industrial)

Package: MQ = Plastic Quad Flat, No Lead Package

5x5x0.09 mm Body (QFN), 20-Lead

SO = Plastic Small Outline - Wide, 7.50 mm Body (SO),

20-Lead

SS = Plastic Shrink Small Outline - 5.30 mm Body (SS),

20-Lead

Examples:

a) AR1100 - I/MQ: Industrial temperature, 20LD

QFN Package.

b) AR1100T - I/MQ: Tape and Reel, Industrial

temperature, 20LD QFN Package

c) AR1100 - I/SO: Industrial temperature, 20LD

SOIC Package.

d) AR1100T - I/SO: Tape and Reel, Industrial tem-

perature, 20LD SOIC Package

e) AR1100 - I/SS: Industrial temperature, 20LD

SSOP Package

f) AR1100T - I/SS: Tape and Reel, Industrial tem-

perature, 20LD SSOP Package

[X](1)

Tape and Reel

Option

DS41606B-page 58  2011 Microchip Technology Inc.

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08/02/11