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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2011 Microchip Technology Inc.
DS41606B-page 5
AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER
1.0
OVERVIEW
The Microchip mTouch
TM
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
DS41606B-page 6
2011 Microchip Technology Inc.
NOTES:
2011 Microchip Technology Inc.
DS41606B-page 7
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
DS41606B-page 8
2011 Microchip Technology Inc.
NOTES:
2011 Microchip Technology Inc.
DS41606B-page 9
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
1
18
V
DD
Power
2
19
OSC1
Oscillator
3
20
OSC2
Oscillator
4
1
MODE
G
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
V
SS
G
ND
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.