AR1021-I/ML [MICROCHIP]
Resistive Touch Screen Controller; 电阻式触摸屏控制器
| 型号： | AR1021-I/ML |
| 厂家： | 
MICROCHIP |
| 描述： | Resistive Touch Screen Controller |
| 文件： | 总70页 (文件大小：3574K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AR1000 Series Resistive
Touch Screen Controller
Data Sheet
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B
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© 2009-2012, Microchip Technology Incorporated, Printed in
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ISBN: 9781620761366
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== ISO/TS 16949 ==
DS41393B-page 2
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH
SCREEN CONTROLLER
AR1000 Series Resistive Touch Screen Controller
Special Features:
Touch Sensor Support:
• RoHS Compliant
• 4-Wire, 5-Wire and 8-Wire Analog Resistive
• Lead-to-Lead Resistance: 50-2,000typical)
• Layer-to-Layer Capacitance: 0-0.5 uF
• Power-Saving Sleep mode
• Industrial Temperature Range
• Built-in Drift Compensation Algorithm
• 128 Bytes of User EEPROM
• Touch Sensor Time Constant: 500 us (maximum)
Touch Resolution:
Power Requirements:
• 10-bit Resolution (maximum)
• Operating Voltage: 2.5-5.0V ±5%
• Standby Current:
- 5V: 85 uA, typical; 125 uA (maximum)
- 2.5V: 40 uA, typical; 60 uA (maximum)
• Operating “No touch” Current:
- 3.0 mA (typical)
• Operating “Touch” Current:
- 17 mA, typical, with a touch sensor having
200 layers.
Touch Coordinate Report Rate:
• 140 Reports Per Second (typical) with a Touch
Sensor of 0.02 uF with 200 Layers
• Actual Report Rate is dependent on the Touch
Sensor used.
Communications:
- Actual current is dependent on the touch
sensor used
• SPI, Slave mode, p/n AR1021
• I2CTM, Slave mode, p/n, AR1021
• UART, 9600 Baud Rate, p/n AR1011
• AR1011/AR1021 Brown-Out Detection (BOR) set
to 2.2V.
Touch Modes:
• Off, Stream, Down, Up and more.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 3
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Table of Contents
1.0 Device Overview .......................................................................................................................................................................... 5
2.0 Basics of Resistive Sensors......................................................................................................................................................... 7
3.0 Hardware.................................................................................................................................................................................... 11
2
4.0 I C Communications .................................................................................................................................................................. 17
5.0 SPI Communications.................................................................................................................................................................. 21
6.0 UART Communications.............................................................................................................................................................. 25
7.0 Touch Reporting Protocol........................................................................................................................................................... 27
8.0 Configuration Registers.............................................................................................................................................................. 29
9.0 Commands................................................................................................................................................................................. 35
10.0 Application Notes ....................................................................................................................................................................... 45
11.0 Electrical Specifications.............................................................................................................................................................. 51
12.0 Packaging Information................................................................................................................................................................ 53
Appendix A: Revision History............................................................................................................................................................... 63
Appendix B: Device Differences........................................................................................................................................................... 64
Index .................................................................................................................................................................................................... 65
The Microchip Web Site....................................................................................................................................................................... 67
Customer Change Notification Service ................................................................................................................................................ 67
Customer Support................................................................................................................................................................................ 67
Reader Response ................................................................................................................................................................................ 68
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DS41393B-page 4
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
1.1
Applications
1.0
DEVICE OVERVIEW
The Microchip mTouchTM AR1000 Series Resistive
Touch Screen Controller is a complete, easy to
integrate, cost-effective and universal touch screen
controller chip.
The AR1000 Series is designed for high volume, small
form factor touch solutions with quick time to market
requirements – including, but not limited to:
• Mobile communication devices
• Personal Digital Assistants (PDA)
• Global Positioning Systems (GPS)
• Touch Screen Monitors
• KIOSK
The AR1000 Series has sophisticated proprietary
touch screen decoding algorithms to process all touch
data, saving the host from the processing overhead.
Providing filtering capabilities beyond that of other
low-cost devices, the AR1000 delivers reliable, vali-
dated, and calibrated touch coordinates.
• Media Players
• Portable Instruments
• Point of Sale Terminals
Using the on-board EEPROM, the AR1000 can store
and independently apply the calibration to the touch
coordinates before sending them to the host. This
unique combination of features makes the AR1000 the
most resource-efficient touch screen controller for
system designs, including embedded system
integrations.
FIGURE 1-1:
BLOCK DIAGRAM
FIGURE 1-2:
PIN DIAGRAM
AR1000 Series (QFN)
AR1000 Series (SSOP, SOIC)
1
2
VSS
X-
20
19
VDD
M1
3
4
5
6
7
8
9
10
X+ 18
5WSX- 17
SY-
M2
M2
15
14
13
12
11
1
2
3
4
5
X+
5WSX-
Y-
WAKE
SIQ
SY+
SS
16
15
14
13
12
11
Y-
Y+
WAKE
SIQ
SY+
SS
SDO
NC
Y+
SX+
SX+
SDI/SDA/RX
NC
SCK/SCL/TX
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 5
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
TABLE 1-1:
PIN DESCRIPTIONS
Pin
Function
Description/Comments
Supply Voltage
SSOP, SOIC
QFN
1
2
3
18
19
20
VDD
M1
Communication Selection
SY-
Sense Y- (8-wire). Tie to VSS, if
not used.
4
1
M2
4/8-wire or 5-wire Sensor
Selection
5
6
2
3
WAKE
SIQ
Touch Wake-up/Touch Detection
LED Drive/SPI Interrupt. No
connect, if not used.
7
4
5
SY+
SS
Sense Y+ (8-wire). Tie to VSS, if
not used.
8
Slave Select (SPI). Tie to VSS, if
not used.
9
6
SDO
SPI Serial Data Output/I2C™
Interrupt. Tie to Vss, if UART.
10
11
12
13
14
7
NC
No connection. No connect or tie
to VSS or VDD.
SPI/I2C™ Serial Clock/UART
8
SCK/SCL/TX
NC
Transmit
9
No connection. No connect or tie
to VSS or VDD.
I2C™ Serial Data/SPI Serial Data
10
11
SDI/SDA/RX
SX+
Input/UART Receive
Sense X+ (8-wire). Tie to VSS, if
not used.
15
16
17
12
13
14
Y+
Y-
Y+ Drive
Y- Drive
5WSX-
5W Sense (5-wire)/Sense X-
(8-wire). Tie to VSS, if not used.
18
19
20
15
16
17
X+
X-
X+ Drive
X- Drive
VSS
Supply Voltage Ground
DS41393B-page 6
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Bus Bars or Silver Frit electrically connect the ITO on
2.0
BASICS OF RESISTIVE
SENSORS
the flex and stable layers to the sensor’s interface tail.
Bus bars are typically screen printed silver ink. They
are typically much lower in resistivity than the ITO.
2.1
Terminology
X-Axis is the left and right direction on the touch sensor.
ITO (Indium Tin Oxide) is the resistive coating that
makes up the active area of the touch sensor. ITO is a
transparent semiconductor that is sputtered onto the
touch sensor layers.
Y-Axis is the top and bottom direction on the touch
sensor.
Drive Lines supply a voltage gradient across the
sensor.
Flex or Film or Topsheet is the top sensor layer that a
user touches. Flex refers to the fact that the top layer
physically flexes from the pressure of a touch.
2.2
General
Resistive 4, 5, and 8-wire touch sensors consist of two
facing conductive layers, held in physical separation
from each other. The force of a touch causes the top
layer to deflect and make electrical contact with the
bottom layer.
Stable or Glass is the bottom sensor layer that
interfaces against the display.
Spacer Adhesive is a frame of adhesive that connects
the flex and stable layers together around the perimeter
of the sensor.
Touch position measurements are made by applying a
voltage gradient across a layer or axis of the touch
sensor. The touch position voltage for the axis can be
measured using the opposing layer.
Spacer Dots maintain physical and electrical
separation between the flex and stable layers. The dots
are typically printed onto the stable layer.
A comparison of typical sensor constructions is shown
below in Table 2-1.
TABLE 2-1:
Sensor
SENSOR COMPARISON
Comments
4-Wire
Less expensive than 5-wire or 8-wire
Lower power than 5-wire
More linear (without correction) than 5-wire
Touch inaccuracies occur from flex layer damage or resistance changes
5-Wire
8-Wire
Maintains touch accuracy with flex layer damage
Inherent nonlinearity often requires touch data correction
Touch inaccuracies occur from resistance changes
More expensive than 4-wire
Lower power than 5-wire
More linear (without correction) than 5-wire
Touch inaccuracies occur from flex layer damaged
Maintains touch accuracy with resistance changes
The AR1000 Series Resistive Touch Screen
Controllers will work with any manufacturers of analog
resistive 4,
5 and 8-wire touch screens. The
communications and decoding are included, allowing
the user the quickest simplest method of interfacing
analog resistive touch screens into their applications.
The AR1000 Series was designed with an
understanding of the materials and processes that
make up resistive touch screens. The AR1000 Series
Touch Controller is not only reliable, but can enhance
the reliability and longevity of the resistive touch
screen, due to its advanced filtering algorithms and
wide range of operation.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 7
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
2.3
4-Wire Sensor
A 4-wire resistive touch sensor consists of a stable and
flex layer, electrically separated by spacer dots. The
layers are assembled perpendicular to each other. The
touch position is determined by first applying a voltage
gradient across the flex layer and using the stable layer
to measure the flex layer’s touch position voltage. The
second step is applying a voltage gradient across the
stable layer and using the flex layer to measure the
stable layer’s touch position voltage.
The measured voltage at any position across a driven
axis is predictable. A touch moving in the direction of
the driven axis will yield a linearly changing voltage. A
touch moving perpendicular to the driven axis will yield
a relatively unchanging voltage (See Figure 2-1).
FIGURE 2-1:
4-WIRE DECODING
DS41393B-page 8
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
The basic decoding of an 8-wire sensor is similar to a
2.4
8-Wire Sensor
4-wire. The difference is that an 8-wire sensor has four
additional interconnects used to reference sensor
voltage back to the controller.
An 8-wire resistive touch sensor consists of a stable
and flex layer, electrically separated by spacer dots.
The layers are assembled perpendicular to each other.
The touch position is determined by first applying a
voltage gradient across the flex layer and using the
stable layer to measure the flex layer’s touch position
voltage. The second step is applying a voltage gradient
across the stable layer and using the flex layer to
measure the stable layer’s touch position voltage.
A touch system may experience voltage losses due to
resistance changes in the bus bars and connection
between the controller and sensor. The losses can vary
with product use, temperature, and humidity. In a
4-wire sensor, variations in the losses manifest them-
selves as error or drift in the reported touch location.
The four additional sense lines found on 8-wire sensors
are added to dynamically reference the voltage to cor-
rect for this fluctuation during use (See Figure 2-2).
The measured voltage at any position across a driven
axis is predictable. A touch moving in the direction of
the driven axis will yield a linearly changing voltage. A
touch moving perpendicular to the driven axis will yield
a relatively unchanging voltage.
FIGURE 2-2:
8-WIRE DECODING
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 9
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
To measure the X-axis, the left edge of the layer is
2.5
5-Wire Sensor
driven with 0V (ground), using connections to the upper
left and lower left sensor corners. The right edge is
driven with +5 VDC, using connections to the upper
right and lower right sensor corners.
A 5-wire resistive touch sensor consists of a flex and
stable layer, electrically separated by spacer dots. The
touch position is determined by first applying a voltage
gradient across the stable layer in the X-axis direction
and using the flex layer to measure the axis touch posi-
tion voltage. The second step is applying a voltage gra-
dient across the stable layer in the Y-axis direction and
using the flex layer to measure the axis touch position
voltage.
To measure the Y-axis, the top edge of the layer is
driven with 0V (ground), using connections to the upper
left and upper right sensor corners. The bottom edge is
driven with +5 VDC, using connections to the lower left
and lower right sensor corners.
The measured voltage at any position across a driven
axis is predictable. A touch moving in the direction of
the driven axis will yield a linearly changing voltage. A
touch moving perpendicular to the driven axis will yield
a relatively unchanging voltage (See Figure 2-3).
The voltage is not directly applied to the edges of the
active layer, as it is for 4-wire and 8-wire sensors. The
voltage is applied to the corners of a 5-wire sensor.
FIGURE 2-3:
5-Wire Decoding
DS41393B-page 10
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
3.0
HARDWARE
3.1
Main Schematic
A main application schematic for the SOIC/SSOP
package pinout is shown in Figure 3-1.
See Figure 1-2 for the QFN package pinout.
FIGURE 3-1:
MAIN SCHEMATIC (SOIC/SSOP PACKAGE PINOUT)
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 11
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
3.2
4, 5, 8-Wire Sensor Selection
3.3
4-Wire Touch Sensor Interface
The desired sensor type of 4/8-wire or 5-wire is
hardware selectable using pin M2.
Sensor tail pinouts can vary by manufacturer and part
number. Ensure that both sensor tail pins for one
sensor axis (layer) are connected to the controller’s
X-/X+ pins and the tail pins for the other sensor axis
(layer) are connected to the controller’s Y-/Y+ pins. The
controller’s X-/X+ and Y-/Y+ pin pairs do not need to
connect to a specific sensor axis. The orientation of
controller pins X- and X+ to the two sides of a given
sensor axis is not important. Likewise, the orientation of
controller pins Y- and Y+ to the two sides of the other
sensor axis is not important.
TABLE 3-1:
Type
4/8-WIRE vs. 5-WIRE
SELECTION
M2 pin
4/8-wire
5-wire
VSS
VDD
If 4/8-wire has been hardware-selected, then the
choice of 4-wire or 8-wire is software-selectable via the
TouchOptions Configuration register.
Connections to a 4-wire touch sensor are as follows
(See Figure 3-2).
When 4/8-wire is hardware-selected, the controller
defaults to 4-wire operation. If 8-wire operation is
desired, then the TouchOptions Configuration register
must be changed.
FIGURE 3-2:
4-WIRE TOUCH SENSOR INTERFACE
Tie unused controller pins 5WSX-, SX+, SY-, and SY+
to VSS.
See Section 3.8 “ESD Considerations” and
Section 3.9 “Noise Considerations” for important
information regarding the capacitance of the controller
schematic hardware.
DS41393B-page 12
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
3.4
5-Wire Touch Sensor Interface
Sensor tail pinouts can vary by manufacturer and part
number. Ensure sensor tail pins for one pair of
diagonally related sensor corners are connected to the
controller’s X-/X+ pins and the tail pins for the other pair
of diagonally related corners are connected to the
controller’s Y-/Y+ pins.
The controller’s X-/X+ and Y-/Y+ pin pairs do not need
to connect to a specific sensor axis. The orientation of
controller pins X- and X+ to the two selected diagonal
sensor corners is not important.
Likewise, the orientation of controller pins Y- and Y+ to
the other two selected diagonal sensor corners is not
important. The sensor tail pin connected to its top layer
must be connected to the controller’s 5WSX- pin.
Connections to a 5-wire touch sensor are shown in
Figure 3-3 below.
FIGURE 3-3:
5-WIRE TOUCH SENSOR INTERFACE
Tie unused controller pins SX+, SY-, and SY+ to VSS.
See “Section 3.8 “ESD Considerations” and
Section 3.9 “Noise Considerations” for important
information regarding the capacitance of the controller
schematic hardware.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 13
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Consult with the sensor manufacturer’s specification to
3.5
8-Wire Touch Sensor Interface
determine which member of each edge connected pair
is the special 8-wire “sense” connection. Incorrectly
connecting the sense and excite lines to the controller
will adversely affect performance.
Sensor tail pinouts can vary by manufacturer and part
number. Ensure both sensor tail pins for one sensor
axis (layer) are connected to the controller’s X-/X+ pins
and the tail pins for the other sensor axis (layer) are
connected to the controller’s Y-/Y+ pins.
The controller requires that the main and “sense” tail
pin pairs for sensor edges be connected to controller
pin pairs as follows:
The controller’s X-/X+ and Y-/Y+ pin pairs do not need
to connect to a specific sensor axis. The orientation of
controller pins X- and X+ to the two sides of a given
sensor axis is not important. Likewise, the orientation of
controller pins Y- and Y+ to the two sides of the other
sensor axis is not important.
• Y- and SY-
• Y+ and SY+
• X- and 5WSX-
• X+ and SX+
Connections to a 8-wire touch sensor are shown in
Figure 3-4 below.
The 8-wire sensor differs from a 4-wire sensor in that
each edge of an 8-wire sensor has a secondary
connection brought to the sensor’s tail. These
secondary connections are referred to as “sense” lines.
The controller pins associated with the sense line for an
8-wire sensor contain an ‘S’ prefix in their respective
names. For example, the SY- pin is the sense line
connection associated with the main Y- pin connection.
FIGURE 3-4:
8-WIRE TOUCH SENSOR INTERFACE
See Section 3.8 “ESD Considerations” and
Section 3.9 “Noise Considerations” for important
information regarding the capacitance of the controller
schematic hardware.
DS41393B-page 14
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
3.6
Status LED
3.8
ESD Considerations
The LED and associated resistor are optional.
ESD protection is shown on the 4-wire, 5-wire, and
8-wire interface applications schematics.
FIGURE 3-5:
The capacitance of alternate ESD diodes may
adversely affect touch performance.
A
lower
capacitance is better. The PESD5V0S1BA parts shown
in the reference design have a typical capacitance of 35
pF. Test to ensure that selected ESD protection does
not degrade touch performance.
ESD protection is shown in the reference design, but
acceptable protection is dependent on your specific
application. Ensure your ESD solution meets your
design requirements.
The LED serves as a status indicator that the controller
is functioning. It will slow flash when the controller is
running with no touch in progress. It will flicker quickly
(mid-level on) when a touch is in progress.
3.9
Noise Considerations
If the LED is used with SPI communication, then the
LED will be off with no touch and flicker quickly
(mid-level on) when a touch is in progress.
Touch sensor filtering capacitors are included in the
reference design.
Note:
If the SIQ pin is not used, it must be left as
a No Connect and NOT tied to circuit VDD or
VSS.
Warning: Changing the value of the capacitors may
adversely affect performance of the touch system.
3.7
WAKE Pin
The AR1000’s WAKE pin is described as “Touch
Wake-Up/Touch Detection”. It serves the following
three roles in the controller’s functionality:
• Wake-up from touch
• Touch detection
• Measure sensor capacitance
The application circuit shows a 20 KΩ resistor
connected between the WAKE pin and the X- pin on the
controller chip. The resistor is required for product
operation, based on all three of the above roles.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 15
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
NOTES:
DS41393B-page 16
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
2
TM
4.0
I C COMMUNICATIONS
The AR1021 is an I2C slave device with a 7-bit address
of 0x4D, supporting up to 400 kHz bit rate.
A master (host) device interfaces with the AR1021.
2
4.1
I C Hardware Interface
A summary of the hardware interface pins is shown
below in Table 4-1.
TABLE 4-1:
AR1021 Pin
I2C HARDWARE INTERFACE
Description
M1
Connect to VSS to select I2C™ communications
Serial Clock to master I2C
Serial Data to master I2C
SCL
SDA
SDO
Data ready interrupt output to master
M1 Pin
• The M1 pin must be connected to VSS to config-
ure the AR1021 for I2C communications.
SCL Pin
• The SCL (Serial Clock) pin is electrically
open-drain and requires a pull-up resistor, typi-
cally 2.2 K to 10 K, from SCL to VDD.
• SCL Idle state is high.
SDA Pin
• The SDA (Serial Data) pin is electrically
open-drain and requires a pull-up resistor, typi-
cally 2.2K to 10K, from SDA to VDD.
• SDA Idle state is high.
• Master write data is latched in on SCL rising
edges.
• Master read data is latched out on SCL falling
edges to ensure it is valid during the subsequent
SCL high time.
SDO Pin
• The SDO pin is a driven output interrupt to the
master.
• SDO Idle state is low.
• SDO will be asserted high when the AR1021 has
data ready (touch report or command response)
for the master to read.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 17
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
2
4.2
I C Pin Voltage Level
Characteristics
TABLE 4-2:
Function
I2C PIN VOLTAGE LEVEL CHARACTERISTICS
Pin
Input
Output
SCL/SCK
SCL/SCK/TX
VSS ≤ VIL≤ 0.2*VDD
—
0.8*VDD ≤ VIH ≤ VDD
SDO
SDA
SDO
—
VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)
(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD
SDI/SDA/RX
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
Open-drain
Note 1: These parameters are characterized but not tested.
2: At 10 mA.
3: At –4 mA.
4.3
Addressing
TABLE 4-5:
I2C DEVICE READ ID
ADDRESS
The AR1021’s device ID 7-bit address is: 0x4D
(0b1001101)
A7 A6 A5 A4 A3 A2 A1 A0
1
0
0
1
1
0
1
1
0x9B
TABLE 4-3:
I2C DEVICE ID ADDRESS
Device ID Address, 7-bit
4.4
Master Read Bit Timing
A7
A6
A5
A4
A3
A2
A1
Master read is to receive touch reports and command
responses from the AR1021.
1
0
0
1
1
0
1
• Address bits are latched into the AR1021 on the
rising edges of SCL.
• Data bits are latched out of the AR1021 on the
rising edges of SCL.
• ACK is presented (by AR1021 for address, by
master for data) on the ninth clock.
• The master must monitor the SCL pin prior to
asserting another clock pulse, as the AR1021
may be holding off the master by stretching the
clock.
TABLE 4-4:
I2C DEVICE WRITE ID
ADDRESS
A7 A6 A5 A4 A3 A2 A1 A0
1
0
0
1
1
0
1
0
0x9A
FIGURE 4-1:
I2C MASTER READ BIT TIMING DIAGRAM
Steps
4. AR1021 compares the received address to its
device ID. If they match, the AR1021
acknowledges (ACK) the master sent address
by presenting a low on SDA, followed by a
low-high-low on SCL.
1. SCL and SDA lines are Idle high.
2. Master presents “Start” bit to the AR1021 by
taking SDA high-to-low, followed by taking SCL
high-to-low.
5. Master monitors SCL, as the AR1021 may be
“clock stretching”, holding SCL low to indicate
that the master should wait.
3. Master presents 7-bit Address, followed by a
R/W = 1 (Read mode) bit to the AR1021 on
SDA, at the rising edge of eight master clock
(SCL) cycles.
DS41393B-page 18
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
6. Master receives eight data bits (MSb first)
presented on SDA by the AR1021, at eight
sequential master clock (SCL) cycles. The data
is latched out on SCL falling edges to ensure it
is valid during the subsequent SCL high time.
9. Master presents a “Stop” bit to the AR1021 by
taking SCL low-high, followed by taking SDA
low-to-high.
4.5
Master Write Bit Timing
7. If data transfer is not complete, then:
Master write is to send supported commands to the
AR1021.
- Master acknowledges (ACK) reception of the
eight data bits by presenting a low on SDA,
followed by a low-high-low on SCL.
- Go to step 5.
• Address bits are latched into the AR1021 on the
rising edges of SCL.
• Data bits are latched into the AR1021 on the
rising edges of SCL.
• ACK is presented by AR1021 on the ninth clock.
• The master must monitor the SCL pin prior to
asserting another clock pulse, as the AR1021
may be holding off the master by stretching the
clock.
8. If data transfer is complete, then:
- Master acknowledges (ACK) reception of the
eight data bits and a completed data transfer
by presenting a high on SDA, followed by a
low-high-low on SCL.
FIGURE 4-2:
I2C MASTER WRITE BIT TIMING DIAGRAM
Steps
4.6
Clock Stretching
1. SCL and SDA lines are Idle high.
The master normally controls the clock line SCL. Clock
stretching is when the slave device holds the SCL line
low, indicating to the master that it is not ready to
continue the communications.
2. Master presents “Start” bit to the AR1021 by
taking SDA high-to-low, followed by taking SCL
high-to-low.
3. Master presents 7-bit Address, followed by a
R/W = 0 (Write mode) bit to the AR1021 on
SDA, at the rising edge of eight master clock
(SCL) cycles.
During communications, the AR1021 may hold off the
master by stretching the clock with a low on SCL.
The master must monitor the slave SCL pin to ensure
the AR1021 is not holding it low, prior to asserting
another clock pulse for transmitting or receiving.
4. AR1021 compares the received address to its
device ID. If they match, the AR1021
acknowledges (ACK) the master sent address
by presenting a low on SDA, followed by a
low-high-low on SCL.
4.7
AR1020 Write Conditions
The AR1020 part does not implement clock stretching
on write conditions.
5. Master monitors SCL, as the AR1021 may be
“clock stretching”, holding SCL low to indicate
the master should wait.
A 50 us delay is needed before the Stop bit, when
clocking a command to the AR1020.
6. Master presents eight data bits (MSb first) to the
AR1021 on SDA, at the rising edge of eight mas-
ter clock (SCL) cycles.
7. AR1021 acknowledges (ACK) receipt of the
eight data bits by presenting a low on SDA, fol-
lowed by a low-high-low on SCL.
8. If data transfer is not complete, then go to step 5.
9. Master presents a “Stop” bit to the AR1021 by
taking SCL low-high, followed by taking SDA
low-to-high.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 19
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
4.8
Touch Report Protocol
Touch coordinates, when available, are provided to the
master by the AR1021 in the following protocol (See
Figure 4-3).
FIGURE 4-3:
I2C TOUCH REPORT PROTOCOL
Note that the IRQ signal shown above occurs on the
SDO pin of the AR1021.
4.9
Command Protocol
The master issues supported commands to the
AR1021 in the following protocol.
Below is an example of the ENABLE_TOUCHcommand
(see Figure 4-4).
FIGURE 4-4:
I2C COMMAND PROTOCOL
Note that the IRQ shown above occurs on the SDO pin.
4.10 Sleep State
• 0x9A
• 0x00
AR1021 Device ID address
Protocol command byte (send 0x00 for
the protocol command register)
Header
Data size
Command
Pending communications are not maintained through a
sleep/wake cycle.
If the SDO pin is asserted for a pending touch report or
command response, and the AR1021 enters a Sleep
state, prior to the master performing a read on the data,
then the data is lost.
• 0x55
• 0x01
• 0x12
DS41393B-page 20
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
5.0
SPI COMMUNICATIONS
SPI operates in Slave mode with an Idle low SCK and
data transmitted on the SCK falling edge.
5.1
SPI Hardware Interface
A summary of the hardware interface pins is shown
below in Table 5-1.
TABLE 5-1:
AR1021 Pin
SPI HARDWARE INTERFACE
Description
M1
SDI
SCK
SDO
SIQ
SS
Connect to VDD to select SPI communications
Serial data sent from master
Serial clock to master
Serial data to master SPI
Interrupt output to master (optional)
Slave Select (optional)
SIQ Pin
SCK Pin
• The AR1021 controller’s SCL/SCK/TX pin
receives Serial Clock (SCK), controlled by the
host.
• The AR1021 controller’s SIQ pin provides an
optional interrupt output from the controller to the
host.
• The Idle state of the SCK should be low.
• Data is transmitted on the falling edge of SCK.
• The SIQ pin is asserted high when the controller
has data available (a touch report or a command
response) for the host.
• The SIQ pin is deasserted after the host clocks
out the first byte of the data packet.
SDI Pin
• The AR1021 controller’s SDI/SDA/RX pin reads
Serial Data Input (SDI), sent by the host.
SDO Pin
Note:
The AR1000 Development kit PICkit™
Serial Pin 1 is designated for the SIQ
interrupt pin after the firmware updated is
executed for the PICkit.
• The AR1021 controller’s SDO pin presents Serial
Data Output (SDO) to the host.
SS Pin
• The AR1021 controller’s SS pin provides optional
“slave select” functionality.
SS Pin Level
VSS
AR1021 Select
Active
VDD
Inactive
In the ‘inactive’ state, the controller’s SDO pin presents
a high-impedance in order to prevent bus contention
with another device on the SPI bus.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 21
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
5.2
SPI Pin Voltage Level
Characteristics
TABLE 5-2:
SPI PIN VOLTAGE CHARACTERISTICS
Operating Voltage: 2.5V ≤ VDD ≤ 5.25V
Function
SCK
Pin
Input
Output
SCL/SCK/TX
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
—
—
SDI
SDI/SDA/RX
SDO
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
SDO
—
—
VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)
(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD
SIQ
SS
SIQ
SS
VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)
(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
Note 1: These parameters are characterized but not tested.
2: At 10 mA.
3: At -4 mA.
5.3
Data Flow
5.4
Touch Report Protocol
SPI data is transferred by the host clocking the AR1021
controller’s Serial Clock (SCK) pin.
The AR1021 controller’s touch reporting is interrupt
driven:
Each host driven clock cycle simultaneously shifts a bit
of data into and out from the AR1021 controller:
• The AR1021 controller asserts the SIQ interrupt
pin high when it has a touch report ready.
• The host clocks out the bytes of the touch report
packet from the AR1021 controller.
• The AR1021 controller clears the SIQ interrupt pin
low, after the first byte of the touch report packet
has been clocked out by the host.
• Out from the AR1021 controller’s Serial Data Out
(SDO) line.
• Into the AR1021 controller’s Serial Data In (SDI)
line.
The data is shifted Most Significant bit (MSb) first.
The communication protocol for the AR1021 controller
reporting touches to the host as shown below in
Figure 5-1.
If the host clocks data out from the AR1021 controller
when no valid data is available, then a byte value of
0x4d will be presented by the controller.
FIGURE 5-1:
SPI TOUCH REPORT PROTOCOL
DS41393B-page 22
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
• The host clocks out the bytes of the command
5.5
Command Protocol
response from the AR1021 controller.
• The AR1021 controller clears the SIQ interrupt pin
low, after the first byte of the command response
has been clocked out by the host.
The AR1021 controller receives commands from the
host as follows:
• The host clocks the bytes of a command to the
AR1021 controller.
• The AR1021 controller asserts the SIQ interrupt
pin high when it is ready with a response to the
command sent by the host.
The communication protocol for the host sending the
ENABLE_TOUCHcommand to the AR1021 controller is
shown below in Figure 5-2.
FIGURE 5-2:
SPI TIMING DIAGRAM – COMMAND PROTOCOL (ENABLE_TOUCH)
5.6
SPI Bit Timing – General
General timing waveforms are shown below in
Figure 5-3.
FIGURE 5-3:
SPI GENERAL BIT TIMING WAVEFORM
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 23
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
5.7.2
INTER-BYTE DELAY
5.7
Timing – Bit Details
The AR1021 controller requires an inter-byte delay of
~50 us. This means the host should wait ~50 us
between the end of clocking a given byte and the start
of clocking the next byte.
5.7.1
BIT RATE
The SPI standard does not specify a maximum data
rate for the serial bus. In general, SPI data rates can be
in MHz. Peripherals devices, such as the AR1021
controller, specify their own unique maximum SPI data
rates.
5.7.3
BIT TIMING – DETAIL
Characterized timing details are shown below, in
Figure 5-4.
The maximum SPI bit rate for the AR1021 controller is
~900 kHz.
Characterization has been performed at bit rates of ~39
kHz and ~156 kHz.
FIGURE 5-4:
SPI BIT TIMING – DETAIL
TABLE 5-3:
SPI BIT TIMING MIN. AND MAX. VALUES
Parameter Number(1)
Parameter Description
Min.
Max.
Units
10
11
12
13
14
15
16
17
18
19
SS↓ (select) to SCK↑ (initial)
SCK high
500
550
550
800
100
100
—
—
—
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SCK low
—
SCK↓ (last) to SS↑ (deselect)
SDI setup before SCK↓
SDI hold after SCK↓
SDO valid after SCK↓
SDO↑ rise
—
—
—
150
50
50
50
—
SDO↓ fall
—
SS↑ (deselect) to SDO High-z
10
Note 1: Parameters are characterized, but not tested.
DS41393B-page 24
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
6.0
UART COMMUNICATIONS
TABLE 6-1:
UART HARDWARE INTERFACE
AR1011 Pin
Description
M1
TX
Connect M1 to VDD to select UART communications
Transmit to host
RX
Receive from host
SDO
Connect SDO to VSS
UART communication is fixed at 9600 baud rate, 8N1
format.
Sleep mode will cause the TX line to drop low, which
may appear as a 0x00 byte sent from the controller.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 25
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
NOTES:
DS41393B-page 26
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
7.0
TOUCH REPORTING
PROTOCOL
Touch coordinates are sent from the controller to the
host system in a 5-byte data packet, which contains the
X-axis coordinate, Y-axis coordinate, and a “Pen-Up/
Down” touch status.
The range for X-axis and Y-axis coordinates is from 0-
4095 (12-bit). The realized resolution is 1024, and bits
X1:X0 and Y1:Y0 are zeros.
It is recommended that applications be developed to
read the 12-bit coordinates from the packet and use
them in a 12-bit format. This enhances the application
robustness, as it will work with either 10 or 12 bits of
coordinate information.
The touch coordinate reporting protocol is shown below
in Table 7-1.
TABLE 7-1:
Byte #
TOUCH COORDINATE REPORTING PROTOCOL
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
1
2
3
4
5
1
0
0
0
0
R
X6
0
R
X65
0
R
R
R
R
P
X4
X3
X2
X9
Y2
Y9
X1
X8
Y1
Y8
X0
X7
Y0
Y7
X11
Y4
X10
Y3
Y6
0
Y5
0
Y11
Y10
where:
• P:
• R:
0Pen Up, 1Pen Down
Reserved
• X11-X0: X-axis coordinate
• Y11-Y0: Y-axis coordinate
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 27
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
NOTES:
DS41393B-page 28
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
8.1
Restoring Default Parameters
8.0
CONFIGURATION REGISTERS
• AR1010/AR1020
The Configuration registers allow application specific
customization of the controller. The default values have
been optimized for most applications and are
automatically used, unless you choose to change
them.
The factory default settings for the Configuration
registers can be recovered by writing a value of 0xFF
to address 0x00 of the EEPROM, then cycling power.
• AR1011/AR1021
Unique sensors and/or product applications may
benefit from adjustment of Configuration registers.
The factory default settings for the Configuration
registers can be recovered by writing a value of 0xFF
to addresses 0x01 and 0x29 of the EEPROM, then
cycling power.
Note:
Although most registers can be
configured for a value ranging from 0 to
255, using a value outside the specified
range for the specific register may
negatively impact performance.
TABLE 8-1:
CONFIGURATION REGISTERS
Address
AR1010/
AR1020
Default
AR1011/
AR1021
Default
Register Name
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Offset
<Special Use>
<Special Use>
TouchThreshold
SensitivityFilter
SamplingFast
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
<Non-Configurable>
<Non-Configurable>
Value of: 0-255
0x58
0x01
0xC5
0x04
0x04
0x10
0x02
0x08
0x04
0x23
0x64
0x80
0xB1
0x00
0x19
0xC8
0x03
0x00
0x00
0x58
0x01
0xC5
0x04
0x04
0x10
0x04
0x08
0x04
0x23
0x64
0x80
0xB1
0x00
0x19
0xC8
0x03
0x00
0x00
Value of: 0-255
Value of: 1, 2, 4, 8, 16, 32, 64, 128
Value of: 1, 2, 4, 8, 16, 32, 64, 128
Value of: 1-8
SamplingSlow
AccuracyFilterFast
AccuracyFilterSlow
SpeedThreshold
<Special Use>
SleepDelay
Value of: 1-8
Value of: 0-255
<Non-Configurable>
Value of: 0-255
PenUpDelay
Value of: 0-255
TouchMode
PD2 PD1 PD0 PM1 PM0 PU2 PU1 PU0
TouchOptions
—
—
—
—
—
—
48W CCE
CalibrationInset
PenStateReportDelay
<Special Use>
TouchReportDelay
<Special Use>
Value of: 0-40
Value of: 0-255
<Non-Configurable>
Value of: 0-255
Configuration registers are defined as an Offset value
from the Start address for the register group.
• Issue the REGISTER_READor REGISTER_WRITE
command, using the calculated register’s
absolute address.
To read or write to a register, do the following:
• Issue the
REGISTER_START_ADDRESS_REQUESTcom-
mand to obtain the Start address for the register
group.
Warning: Use of invalid register values will yield
unpredictable results.
• Calculate the desired register’s absolute address
by adding the register’s Offset value to Start
address for the register group.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 29
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
8.2.5
AccuracyFilterFast Register (OFFSET
0x06)
8.2
Register Descriptions
8.2.1
TouchThreshold Register (OFFSET
0x02)
The AccuracyFilterFast register sets the level of an
accuracy enhancement filter, used when the touch
movement is fast. See the SpeedThreshold register for
information on the touch movement threshold. A lower
value will provide better touch coordinate resolution
when the touch motion is fast, but may exhibit more
low-frequency noise error in the touch position. A
higher value will reduce touch coordinate resolution
when the touch motion is fast, but will reduce low-fre-
quency random noise error in the touch position. Valid
values are as follows:
The TouchThreshold register sets the threshold for a
touch condition to be detected as a touch. A touch is
detected if it is below the TouchThreshold setting. Too
small of a value might prevent the controller from
accepting a real touch, while too large of a value might
allow the controller to accept very light or false touch
conditions. Valid values are as follows:
0 ≤ TouchThreshold ≤ 255
8.2.2
SensitivityFilter Register (OFFSET
0x03)
1 ≤ AccuracyFilterFast ≤ 8
Higher values may improve accuracy with some
sensors.
The SensitivityFilter register sets the level of touch sen-
sitivity. A higher value is more sensitive to a touch
(accepts a lighter touch), but may exhibit a less stable
touch position. A lower value is less sensitive to a touch
(requires a harder touch), but will provide a more stable
touch position. Valid values are as follows:
8.2.6
AccuracyFilterSlow Register
(OFFSET 0x07)
The AccuracyFilterSlow register sets the level of an
accuracy enhancement filter, used when the touch
movement is slow. See the SpeedThreshold register for
information on the touch movement threshold. A lower
value will provide better touch coordinate resolution
when the touch motion is slow, but may exhibit more
low-frequency noise error in the touch position. A
higher value will reduce touch coordinate resolution
when the touch motion is slow, but will reduce low-fre-
quency random noise error in the touch position. Valid
values are as follows:
0 ≤ SensitivityFilter ≤ 10
8.2.3
SamplingFast Register (OFFSET
0x04)
The SamplingFast register sets the level of touch mea-
surement sample averaging, when touch movement is
determined to be fast. See the SpeedThreshold regis-
ter for information on the touch movement threshold. A
lower value will provide for a higher touch coordinate
reporting rate when touch movement is fast, but may
exhibit more high-frequency random noise error in the
touch position. A higher value will reduce the touch
coordinate reporting rate when touch movement is fast,
but will reduce high-frequency random noise error in
the touch position. Valid values are as follows:
1 ≤ AccuracyFilterSlow ≤ 8
8.2.7
SpeedThreshold Register (OFFSET
0x08)
The SpeedThreshold register 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 as fast. A higher value increases the
touch movement speed that will be considered as fast.
Valid values are as follows:
SamplingFast: <1, 4, 8, 16, 32, 64, 128>
Recommended Values: <4, 8, 16>
Higher values may improve accuracy with some
sensors.
0 ≤ SpeedThreshhold ≤ 255
8.2.4
SamplingSlow Register (OFFSET
0x05)
The SamplingSlow register sets the level of touch mea-
surement sample averaging, when touch movement is
slow. See the SpeedThreshold register for information
on the touch movement threshold. A lower value will
increase the touch coordinate reporting rate when the
touch motion is slow, but may exhibit a less stable more
jittery touch position. A higher value will decrease the
touch coordinate reporting rate when the touch motion
is slow, but will provide a more stable touch position.
Valid values are as follows:
SamplingSlow: 1, 2, 4, 8, 16, 32, 64, 128
DS41393B-page 30
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
8.2.8
SleepDelay Register (OFFSET 0x0A)
8.2.10
TouchMode Register (OFFSET 0x0C)
The SleepDelay register sets the time duration with no
touch or command activity that will cause the controller
to enter a low-power Sleep mode. Valid values are as
follows:
The TouchMode register configures the action taken for
various touch states.
There are three states of touch for the controller’s touch
reporting action which can be independently controlled.
0 ≤ SleepDelay ≤ 255
Touch States:
Sleep Delay Time = SleepDelay * 100 ms; when Sleep-
Delay > 0
1. Pen Down (initial touch)
User defined 0-3 touch reports, with selectable pen
states.
A value of zero disables the Sleep mode, such that the
controller will never enter low-power Sleep mode.
2. Pen Movement (touch movement after initial
touch)
A touch event will wake the controller from low-power
Sleep mode and start sending touch reports. Commu-
nications sent to the controller will wake it from the low-
power Sleep mode and initiate action to the command.
User defined no-touch reports or streaming touch
reports, with selectable pen states.
3. Pen Up (touch release)
8.2.9
PenUpDelay Register (OFFSET
0x0B)
User defined 0-3 touch reports, with selectable pen
states.
The PenUpDelay register sets the duration of a pen-up
event that the controller will allow, without sending a
pen-up report for the event. The delay time is started
upon detecting a pen-up condition.
Every touch report includes a “P” (Pen) bit that
indicates the pen state.
• Pen Down: P = 1
• Pen Up:
P = 0
If a pen down is reestablished before the delay time
expires, then pen-down reports will continue without a
pen up being sent. This effectively debounces a touch
event in process.
A lower value will make the controller more responsive
to pen ups, but will cause more touch drop outs with a
lighter touch. A higher value will make the controller
less responsive to pen ups, but will reduce the number
of touch drop outs with a lighter touch. Valid values are
as follows:
0 ≤ PenUpDelay ≤ 255
Pen-up Delay Time ≈ PenUpDelay * 240 μs
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 31
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
REGISTER 8-1:
TouchMode REGISTER FORMAT
R/W
PD2
R/W
PD1
R/W
PD0
R/W
PM1
R/W
PM0
R/W
PU2
R/W
PU1
R/W
PU0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7-5
PD<2:0>: Pen-Down State bits (action taken upon pen down).
000= No touch report
001= Touch report with P=0
010= Touch report with P=1
011= Touch report with P=1, then touch report with P=0
100= Touch report with P=0, then touch report with P=1, then touch report with P=0
101= Touch report with P=0, then touch report with P=1
bit 4-3
bit 2-0
PM<1:0>: Pen Movement State bits (action taken upon pen movement).
00= No touch report
01= Touch report with P=0
10= Touch report with P=1
PU<2:0>: Pen-Up State bits (action taken upon pen up).
000= No touch report
001= Touch report with P=0
010= Touch report with P=1
011= Touch report with P=1, then touch report with P=0
100= Touch report with P=0, then touch report with P=1, then touch report with P=0
101= Touch report with P=0, then touch report with P=1
A couple of typical setup examples for the TouchMode
are as follows:
• Report a pen down P=1on initial touch, followed
by reporting a stream of pen downs P=1during
the touch, followed by a final pen up P=0on touch
release. TouchMode = 0b01010001= 0x51
• Report a pen up P=0then a pen down P=1on
initial touch, followed by reporting a stream of pen
downs P=1during the touch, followed by a final
pen up P=0on touch release. TouchMode =
0b10110001= 0xB1
DS41393B-page 32
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
8.2.11
TouchOptions Register (OFFSET
0x0D)
The TouchOptions register contains various “touch”
related option bits.
REGISTER 8-2:
TouchOptions REGISTER
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R/W
48W
R/W
CCE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7-2
bit 1
Unimplemented: Read as ‘0’
48W: 4-Wire or 8-Wire Sensor Selection bit
1= Selects 8-wire Sensor Operating mode
0= Selects 4-wire Sensor Operating mode
bit 0
CCE: Calibrated Coordinates Enable bit
1= Enables calibrated coordinates, if the controller has been calibrated
0= Disables calibrated coordinates
Calibration Inset = (CalibrationInset/2) %, Range of 0-
20% with 0.5% resolution
Note:
A 4-wire touch sensor will not work if the
48W Configuration bit is incorrectly
defined as 1, which selects 8-wire.
For example, CalibrationInset = 25 (0x19) yields a cal-
ibration inset of (25/2) or 12.5%. During the calibration
procedure, the controller will internally extrapolate the
calibration point touch values in Calibration mode by
12.5% to achieve full scale.
An 8-wire touch sensor will provide basic
operation if the 48W Configuration bit is
incorrectly defined as 0, which selects 4-
wire. However, the benefit of the 8-wire
sensor will only be realized if the 48W
Configuration bit is correctly defined as 1,
selecting 8-wire.
FIGURE 8-1:
12.5% of
Full Scale
8.2.12
CalibrationInset Register (OFFSET
0x0E)
The CalibrationInset register defines the expected
position of the calibration points, inset from the perime-
ter of the touch sensor’s active area, by a percentage
of the full scale dimension.
12.5% of
Full Scale
Location of Calibration
Targets presented during
Calibration.
This allows for the calibration targets to be placed inset
from edge to make it easier for a user to touch them.
The CalibrationInset register value is only used when
the CALIBRATION_MODE command is issued to the
controller. In Calibration mode, the controller will
extrapolate the calibration point touch report values by
the defined CalibrationInset percentage to achieve full
scale.
A
software
application
that
issues
the
CALIBRATION_MODE command must present the
displayed calibration targets at the same inset
percentage as defined in this CalibrationInset register.
Valid values are as follows:
0 ≤ CalibrationInset ≤ 40
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 33
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
8.2.13
PenStateReportDelay Register
(OFFSET 0x0F)
The PenStateReportDelay register sets the delay time
between sending of sequential touch reports for the
“Pen-Down” and “Pen-Up” Touch mode states. See
Section 8.2.10 “TouchMode Register (offset 0x0C)”
for touch modes.
For example, if “Pen-Up” state of the TouchMode
register is configured to send a touch report with P=1,
followed by a touch report with P=0, then this delay
occurs between the two touch reports. This provides
some timing flexibility between the two touch reports
that may be desired in certain applications. Valid values
are as follows.
0 ≤ PenStateReportDelay ≤ 255
Pen State Report Delay Time = PenStateReportDelay *
50 μs
8.2.14
TouchReportDelay Register (OFFSET
0x11)
The TouchReportDelay register sets a forced delay
time between successive touch report packets. This
allows slowing down of the touch report rate, if desir-
able for a given application. For example, a given appli-
cation may not need a high rate of touch reports and
may want to reduce the overhead used to service all of
the touch reports being sent. In this situation, increas-
ing the value of this register will reduce the rate at
which the controller sends touch reports. Valid values
are as follows:
0 ≤ TouchReportDelay ≤ 255
Touch Report Delay Time ≈ TouchReportDelay * 500 μs
DS41393B-page 34
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.0
COMMANDS
9.1
Sending Commands
9.1.1
The
COMMAND SEND FORMAT
controller
supports
application-specific
configuration commands as shown in Table 9-1, below.
TABLE 9-1:
Byte #
COMMAND SEND FORMAT
Name
Value
Description
1
2
3
4
:
Header
Size
0x55
0x<>
0x<>
0x<>
0x<>
Header (mark beginning of command packet)
Size, # of bytes following this byte
Command ID
Command
Data
Data, if applicable for the command
Data, if applicable for the command
Data
To ensure command communication is not interrupted
by touch activity, it is recommended that the controller
touch is disabled, prior to other commands. This can be
done as follows:
1. Send DISABLE_TOUCHcommand
2. Wait 50 ms
3. Send desired commands
4. Send ENABLE_TOUCHcommand
9.1.2
COMMAND RESPONSE
A received command will be responded to as seen in
Table 9-2 below.
TABLE 9-2:
Byte #
COMMAND RESPONSE FORMAT
Name
Value
Description
1
2
3
4
5
:
Header
Size
0x55
0x<>
0x<>
0x<>
0x<>
0x<>
Header (mark beginning of command packet)
Size, # of bytes following this byte
Status
Status
Command
Data
Command ID
Data, if applicable for the command
Data, if applicable for the command
Data
The “Status” value within the response packet should
be one of the following (See Table 9-3):
TABLE 9-3:
Status Value
COMMAND RESPONSE
STATUS VALUES
Description
0x00
0x01
0x03
0x04
Success
Command Unrecognized
Header Unrecognized
Command Time Out (exceeded ~100
ms)
0xFC
Cancel Calibration mode
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 35
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.1.3
DISABLE TOUCH BEFORE
SENDING SUBSEQUENT
COMMANDS
The AR1000 does not support full duplex
communications. It cannot send touch reports to the
host simultaneously with receiving commands from the
host.
Disable AR1000 touch reporting prior to sending any
other command(s), then re-enable touch reporting
when complete with executing other commands.
1. Send the DISABLE_TOUCHcommand.
Check for expected command response.
2. Send a desired command.
Check for expected command response.
3. Repeat at step 2 if another command is to be
sent.
4. Send the ENABLE_TOUCHcommand.
Check for expected command response.
9.1.4
CONFIRM COMMAND IS SENT
Confirm each command sent to the AR1000, prior to
issuing another command, to ensure it is executed.
This is accomplished by evaluating the AR1000
response to a command that has been sent to it.
Check for each of the following five conditions to be
met (See Table 9-4).
TABLE 9-4:
Condition
COMMAND RESPONSE ERROR CONDITIONS
Response Byte
Description
Header
Size
1
Header 0x55 value is expected
2
Size 0x<> value to match what is expected for command sent
Status 0x00 “success” value is expected
Status
ID
3
4
Command ID 0x<> value to match what is expected (ID of sent command)
Data byte count to match what is expected for command sent
Data
5 to end
0x<> represents a value that is dependent on the com-
mand.
An error has occurred if no response is received at all
or if any of the above conditions are not met in the
response from the AR1000. If an error condition
occurs, delay for a period of ~50 ms then send the
same command again.
DS41393B-page 36
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.2
AR1000 Commands
TABLE 9-5:
COMMAND SET SUMMARY
Command
Value
Command Description
0x10
0x12
0x13
0x14
0x20
0x21
0x22
0x23
0x28
0x29
0x2B
GET_VERSION
ENABLE_TOUCH
DISABLE_TOUCH
CALIBRATE_MODE
REGISTER_READ
REGISTER_WRITE
REGISTER_START_ADDRESS_REQUEST
REGISTERS_WRITE_TO_EEPROM
EEPROM_READ
EEPROM_WRITE
EEPROM_WRITE_TO_REGISTERS
9.3
AR1000 Command Descriptions
9.3.1
GET_VERSION– 0x10
Controller will return version number and type.
Send: <0x55><0x01><0x10>
Receive: <0x55><0x05><Response><0x10><Ver-
sion High><Version Low><Type>
where <Type>
REGISTER 9-1:
GET_VERSION <TYPE> FORMAT
R/W
RS1
R/W
RS0
R/W
TP5
R/W
TP4
R/W
TP3
R/W
TP2
R/W
TP1
R/W
TP0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7-6
RS<1:0>: Resolution of Touch Coordinates bits
00= 8-bit
01= 10-bit
10= 12-bit
bit 5-0
9.3.2
TP<5:0>: Type of Controller bits
001010= ARA10
ENABLE_TOUCH– 0x12
9.3.3
DISABLE_TOUCH– 0x13
Controller will send touch coordinate reports for valid
touch conditions.
Controller will not send any touch coordinate reports. A
touch will, however, still wake-up the controller if
asleep.
Send:
<0x55><0x01><0x12>
Send:
<0x55><0x01><0x13>
Receive: <0x55><0x02><Response><0x12>
Receive: <0x55><0x02><Response><0x13>
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 37
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.3.4
CALIBRATE– 0x14
Enter Calibration mode. This instructs the controller to
enter a mode of accepting the next four touches as the
calibration point coordinates. See Section 10.1 “Cali-
bration of Touch Sensor with Controller” for an
example.
Completion of Calibration mode will automatically store
the calibration point coordinates in on-board controller
memory and set (to 1) the CCE bit of the TouchOptions
register. This bit enables the controller to report touch
coordinates that have been processed with the
previously collected calibration data.
To provide for proper touch orientation, the four
sequential calibration touches must be input in the
physical order on the touch sensor, as shown in
Figure 9-1.
FIGURE 9-1:
CALIBRATION ROUTINE
SEQUENCE
#2
#1
Upper Right
Upper Left
Touch Sensor
#3
#4
Lower Left
Lower Right
Upon completion, the controller’s register values and
calibration data are stored to the EEPROM.
The Calibration mode will be cancelled by sending any
command before the mode has been completed. If the
calibration is canceled, the controller response may
appear incorrect or incomplete. This is expected
behavior.
DS41393B-page 38
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.3.4.1
AR1010/AR1020 Calibrate
Response
Send:
<0x55><0x02><0x14><Calibration Type>
Calibration Type
Description
0x04
4 point
Receive: <0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
for initial command response
Response for touch of Calibration point #1
Response for touch of Calibration point #2
Response for touch of Calibration point #3
Response for touch of Calibration point #4
A successful CALIBRATE command results in 5
response packets being sent to the host.
Once the response has been received for the
completed 4th target, a delay of one second must be
implemented prior to sending any commands to the
controller. This one second delay insures all data has
been completely written to the EEPROM.
9.3.4.2
AR1011/AR1021 Calibrate
Response
Send:
<0x55><0x02><0x14><Calibration Type>
Calibration Type
Description
0x04
4 point
Receive: <0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
<0x55><0x02><0x00><0x14>
for initial command response
Response for touch of Calibration point #1
Response for touch of Calibration point #2
Response for touch of Calibration point #3
Response for touch of Calibration point #4
Response after EEPROM has been written
A successful CALIBRATE command results in six
response packets being sent to the host.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 39
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
The raw touch coordinates, decoded by the controller,
for each of the four calibration touches are extrapolated
if CalibrationInset was non-zero. The four coordinate
pairs are then re-oriented, if required, such that the
upper left corner is the minimum (X,Y) “origin” value
pair and the lower right corner is the maximum (X,Y)
value pair.
9.3.4.3
Calibration Data Encoded and
Stored in EEPROM
System integrators may prefer to pre-load a calibration
into their design. This allows the user to properly
navigate to the calibration routine icon or shortcut
without the use of a mouse. This also addresses the
need to calibrate each system individually before
deploying it to the field.
Coordinates are 10-bit significant values, scaled to
16-bit and stored in a High (Hi) and Low (Lo) byte pair.
Separator Upper Left (Node 1) Upper Right (Node 2) Lower Right (Node 3)
Lower Left (Node 4)
Flip State
X
Y
X
Y
X
Y
X
Y
Lo Hi Lo
Hi
Lo
Hi
Lo Hi Lo Hi Lo
Hi
Lo
Hi
Lo
Hi
Decode the above data to as follows:
1. Swap the order of stored low and high bytes for
a given coordinate.
2. Convert the 16-bit value (stored high and low
bytes) from hexadecimal to decimal.
3. Divide the result by 64 to properly rescale the
16-bit stored value back to a 10-bit significant
coordinate.
Example of Low = 0x40 and High = 0xF3:
Swap:
Hex to Decimal: 62272
Divide by 64: 973
0xF340
REGISTER 9-2:
Flip State Byte
U-0
—
U-0
U-0
—
U-0
—
U-0
—
R/W
XYFLIP
R/W
R/W
YFLIP
bit 0
—
XFLIP
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7-3
bit 2
Unimplemented: Read as ‘0’
XYFLIP: X and Y Axis Flip bit
1= X and Y axis are flipped
0= X an Y axis are not flipped
bit 1
bit 0
XFLIP: X-Axis Flip bit
1= X-axis flipped
0= X-axis not flipped
YFLIP:Y-Axis Flip bit
1= Y-axis flipped
0= Y-axis not flipped
For storing desired calibration values to the EEPROM:
• AR1010/AR1020 (See Section 9.3.12 “EEPROM
Map”).
• AR1011/AR1021 (See Section 9.3.12 “EEPROM
Map” and Section 10.2 “AR1011/AR1021 Stor-
ing Default Calibration Values to EEPROM”).
DS41393B-page 40
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
The AR1000 controller will ignore the value entered for
the Register Address High Byte. However, 0x00 is
recommended to safeguard against any possible future
product development.
9.3.5
REGISTER_READ– 0x20
Reads a value from a controller register location. This
can be used to determine a controller configuration
setting.
Configuration registers are defined as an Offset value
from the Start address for the register group. Read a
register as follows:
9.3.7
REGISTER_START_ADDRESS_REQUEST
– 0x22
Configuration registers are defined as an Offset value
from the Start address for the register group. This
command returns the Start address for the register
group.
1. Issue the REGISTER_START_ADDRESS_REQUEST
command to obtain the Start address for the
register group
.
2. Calculate the desired register’s absolute
address by adding the register’s Offset value to
Start address for the register group.
Send: <0x55><0x01><0x22>
Receive:
<0x55><0x03><Response><0x22><Regi
ster Start Address>
3. Issue this REGISTER_READ command, as
follows, using the calculated register’s absolute
address:
9.3.8
REGISTERS_WRITE_TO_EEPROM–
Send: <0x55><0x04><0x20><Register Address
High byte><Register Address Low
byte><# of Registers to Read>
0x23
Save Configuration register values to EEPROM. This
allows the controller to remember configurations
settings through controller power cycles.
Register Address High byte: 0x00
# of Registers to Read:
0x01 thru 0x08
Send:
<0x55><0x01><0x23>
Receive: <0x55><0x02
+
#
of Registers
Receive: <0x55><0x02><Response><0x23>
Read><Response><0x20><Register
value>…<Register value>
9.3.9
EEPROM_READ– 0X28
The AR1000 controller will ignore the value entered for
the Register Address High Byte. However, 0x00 is
recommended to safeguard against any possible future
product development.
The controller has 256 bytes of on-board EEPROM.
• The first 128 bytes (address range 0x00-0x7F)
are reserved by the controller for the Configura-
tion register settings and calibration data.
• The second 128 bytes (address range
0x80-0xFF) are provided for the user’s
application, if desired.
9.3.6
REGISTER_WRITE– 0x21
Write a value to a controller register location. This can
be used to change a controller configuration setting.
This command provides a means to read values from
the EEPROM.
Configuration registers are defined as an Offset value
from the Start address for the register group. Write a
register as follows:
Send:
<0x55><0x04><0x28><EEPROM Address
High byte><EEPROM Address Low
byte><# of EEPROM to Read>
1. Issue the REGISTER_START_ADDRESS_REQUEST
command to obtain the Start address for the
register group.
Register Address High byte: 0x00
# of Registers to Read: 0x01 thru 0x08
2. Calculate the desired register’s absolute
address by adding the register’s Offset value to
Start address for the register group.
Receive: <0x55><0x02
+
#
EEPROM
Read><Response><0x28><EEPROM
value>…<EEPROM value>
3. Issue this REGISTER_WRITE command, as
follows, using the calculated register’s absolute
address:
The AR1000 controller will ignore the value entered for
the EEPROM Address High Byte. However, 0x00 is
recommended to safeguard against any possible future
product development.
Send: <0x55><0x04
+
#
Registers
to
Write><0x21><Register Address High
byte><Register Address Low byte>
<#
of
Registers
to
Write><Data>…<Data>
Register Address High byte: 0x00
# of Registers to Read:
0x01 thru 0x08
Receive: <0x55><0x02><Response><0x21>
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 41
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
9.3.10
EEPROM_WRITE– 0x29
9.3.12
EEPROM MAP
The controller has 256 bytes of on-board EEPROM.
The first 128 bytes in address range 0x00:0x7F are
reserved by the controller for the Configuration register
settings and calibration data. The mapping of data in
this reserved controller space of the EEPROM may
change over different revisions within the product
lifetime.
This command provides a means to write values to the
user space within the EEPROM.
• The first 128 bytes (address range 0x00-0x7F)
are reserved by the controller for the Configura-
tion register settings and calibration data. Only the
Register Write to EEPROM command should be
used to write Configuration registers to EEPROM.
Failure to use the Register Write command to
save Configuration registers to EEPROM may
result in failures or reverting to previously stored
Configuration register values.
The EEPROM_WRITE command must not be used to
write directly to the lower 128 bytes of the controller
EEPROM space of 0x00:0x7F.
The second 128 bytes in address range 0x80:0xFF are
provided for the user’s application, if desired.
• The second 128 bytes (address range
0x80-0xFF) are provided for the user’s applica-
tion, if desired.
TABLE 9-6:
AR1010/AR1020 EEPROM
AND REGISTER MAP
EEPROM Address
Function
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
<Special Use>
<Special Use>
Warning: ONLY write to user EEPROM addresses of
0x80-0xFF.
<Special Use>
One of the following actions is required for
EEPROM changes to be used by the
controller:
Touch Threshold
Sensitivity Filter
• The controller power must be cycled
from OFF to ON or
• Issue the
EEPROM_WRITE_TO_REGISTERS
command.
Sampling Fast
Sampling Slow
Accuracy Filter Fast
Accuracy Filter Slow
Speed Threshold
<Special Use>
Write to EEPROM as follows:
Send: <0x55><0x04
+
#
EEPROM
to
Write><0x29><EEPROM Address High
byte><EEPROM Address Low byte>
Sleep Delay
Pen-Up Delay
<#
of
EEPROM
to
Touch Mode
Write><Data>…<Data>
Touch Options
Register Address High byte: 0x00
Calibration Inset
# of Registers to Read: 0x01 thru 0x08
Receive: <0x55><0x02><Response><0x29>
Pen State Report Delay
<Reserved>
The AR1000 controller will ignore the value entered for
the EEPROM Address High Byte. However, 0x00 is
recommended to safeguard against any possible future
product development.
Touch Report Delay
<Special Use>
Data Block Separator
Calibration UL X-low
Calibration UL X-high
Calibration UL Y-low
Calibration UL Y-high
Calibration UR X-low
Calibration UR X-high
Calibration UR Y-low
Calibration UR Y-high
Calibration LR X-low
Calibration LR X-high
Calibration LR Y-low
9.3.11
EEPROM_WRITE_TO_REGISTERS–
0x2B
Write applicable EEPROM data to Configuration regis-
ters. This will cause the controller to immediately begin
using changes made to EEPROM stored Configuration
register values. A power cycle of the controller will
automatically cause the controller to use changes
made to the EEPROM stored Configuration register
values, without the need for issuing this command. This
command eliminates the need for the power cycle.
Send:
<0x55><0x01><0x2B>
Receive: <0x55><0x02><Response><0x2B>
DS41393B-page 42
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
TABLE 9-6:
AR1010/AR1020 EEPROM
AND REGISTER MAP
TABLE 9-7:
AR1011/AR1021 EEPROM
AND REGISTER MAP
EEPROM Address
Function
EEPROM Address
Function
0x20
0x21
Calibration LR Y-high
Calibration LL X-low
Calibration LL X-high
Calibration LL Y-low
Calibration LL Y-high
Calibration Flip State
<Special Use>
0x1D
0x1E
Calibration UR Y-low
Calibration UR Y-high
Calibration LR X-low
Calibration LR X-high
Calibration LR Y-low
Calibration LR Y-high
Calibration LL X-low
Calibration LL X-high
Calibration LL Y-low
Calibration LL Y-high
Calibration Flip State
Calibration – Checksum
<Special Use>
0x22
0x1F
0x23
0x20
0x24
0x21
0x25
0x22
0x26:0x7E
0x7F
0x23
End of Controller Space
User Space
0x24
0x80:0xFF
0x25
0x26
TABLE 9-7:
AR1011/AR1021 EEPROM
AND REGISTER MAP
0x27
0x28
EEPROM Address
Function
0x29:0x50
0x51:0x7F
0x80:0xFF
<Reserved>
0x00
0x01
Not used
User Space
Configuration Registers –
Block Key
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
<Special Use>
<Special Use>
Touch Threshold
Sensitivity Filter
Sampling Fast
Sampling Slow
Accuracy Filter Fast
Accuracy Filter Slow
Speed Threshold
<Special Use>
Sleep Delay
Pen-Up Delay
Touch Mode
Touch Options
Calibration Inset
Pen State Report Delay
<Special Use>
Touch Report Delay
<Special Use>
Configuration Registers –
Checksum
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
Calibration - Block Key
Calibration UL X-low
Calibration UL X-high
Calibration UL Y-low
Calibration UL Y-high
Calibration UR X-low
Calibration UR X-high
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 43
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
NOTES:
DS41393B-page 44
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
5. Set the Calibration Inset by writing the desired
10.0 APPLICATION NOTES
value to the CalibrationInset register.
Send:<0x55><0x05><0x21><0x00><0x2E><0x01
10.1 Calibration of Touch Sensor with
><0x19>
Controller
Receive: <0x55><0x02><0x00><0x21>
The reported coordinates from
a touch screen
6. Issue the CALIBRATE_MODEcommand.
Send: <0x55><0x02><0x14><0x04>
controller are typically calibrated to the application’s
video display. The task is often left up to the host to
perform. This controller provides a feature for it to send
coordinates that have already been calibrated, rather
than the host needing to perform this task. If enabled,
the feature will apply pre-collected 4-point calibration
data to the reported touch coordinates. Calibration only
accounts for X and Y directional scaling. It does not
correct for angular errors due to rotation of the touch
sensor on the video display.
Receive: <0x55><0x02><0x00><0x14>
7. Software must display the first calibration point
target in the upper left quadrant of the display
and prompt the user to touch and release the
target.
FIGURE 10-1:
SUGGESTED TEXT FOR
FIRST CALIBRATION
TARGET
The calibration process can be cancelled at anytime by
sending a command to the controller.
Upon completion of the calibration process, the
calibration data is automatically stored to the EEPROM
and “Calibrated Coordinates” is enabled.
Touch and
Release Target
The process of “calibration” with the controller is
described below.
1. Disable touch reporting by issuing <Disable
Touch> command.
Send:
<0x55><0x01><0x13>
8. Wait for the user to touch and release the first
calibration point target. Do this by looking for a
controller response of:
Receive: <0x55><0x02><Response><0x13>
2. Get register group Start address by issuing
REGISTER_START_ADDRESS_REQUEST
command.
<0x55><0x02><0x00> <0x14>
9. Software must display the second calibration
point target in the upper right quadrant of the
display and prompt the user to touch and
release the target.
A register Start address of 0x20 is used below, for
this example.
Send:
<0x55><0x01><0x22>
FIGURE 10-2:
SUGGESTED TEXT FOR
SECOND CALIBRATION
TARGET
Receive: <0x55><0x03><0x00><0x22><0x20>
3. Calculate the CalibrationInset register’s address
by adding its offset value of 0x0E to the register
group Start address of 0x20.
Register Address
CalibratioInset Register Offset = 0x20 + 0x0E = 0x2E
=
Register Start Address
+
Touch and
Release Target
4. Calculate the desired value for the CalibrationIn-
set register.
A Calibration Inset of 12.5% is used below for this
example.
10. Wait for the user to touch and release the
second calibration point target. Do this by
CalibrationInset = 2 * Desire Calibration Inset % = 2 *
12.5 = 25 = 0x19
looking for
a
controller response of:
<0x55><0x02><0x00><0x14>
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 45
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
11. Software must display the third calibration point
target in the lower right quadrant of the display
and prompt the user to touch and release the
target.
14. Wait for the user to touch and release the fourth
calibration point target. Do this by looking for a
controller response of:
<0x55><0x02><0x00><0x14>
15. Wait for the controller to correctly write
calibration data into EEPROM
FIGURE 10-3:
SUGGESTED TEXT FOR
THIRD CALIBRATION
TARGET
• AR1010/AR1020: Wait one second for data to
be stored into EEPROM
• AR1011/AR1021: Wait for a controller
response of <0x55><0x02><0x00><0x14>
16. Enable
touch
reporting
by
issuing
Touch and
Release Target
ENABLE_TOUCHcommand.
Send: <0x55><0x01><0x12>
Receive: <0x55><0x02><Response><0x12>
12. Wait for the user to touch and release the third
calibration point target. Do this by looking for a
controller response of:
<0x55><0x02><0x00><0x14>
13. Software must display the fourth calibration
point target in the lower left quadrant of the
display and prompt the user to touch and
release the target.
FIGURE 10-4:
SUGGESTED TEXT FOR
FOURTH CALIBRATION
TARGET
Touch and
Release Target
DS41393B-page 46
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
An example of calculating the checksum is shown
below (See Table 10-1).
10.2 AR1011/AR1021 Storing Default
Calibration Values to EEPROM
If you wish to implement fixed calibration values,
pre-loaded into the AR1000 EEPROM, then the
following procedure must be followed (See
Section 10.2.1 “Preparation for Fixed Calibration
Values”).
10.2.1
PREPARATION FOR FIXED
CALIBRATION VALUES
Determine if fixed calibration values are suitable for
your application and determine your desired values.
Calculate a checksum for your custom data set. See
Section 9.3.4.3 “Calibration Data Encoded and
Stored in EEPROM” for additional details regarding
calibration data format.
TABLE 10-1: CHECKSUM CALCULATION EXAMPLE
Description
Value
Operation
Checksum Result
Seed
0x45
0x55
0x06
0x1B
0xA5
0x08
0x13
0xDF
0xF4
0x0B
0x98
0xE4
0x1E
0xEC
0xBF
0x1A
0x32
0xE7
0x01
n/a
0x45
0x9A
0xA0
0xBB
0x60
0x68
0x7B
0x5A
0x4E
0x59
0xF1
0xD5
0xF3
0xDF
0x9E
0xB8
0xEA
0xD1
0xD2
0xD2
Block Key
Upper Left
Upper Left
Upper Left
Upper Left
Upper Right
Upper Right
Upper Right
Upper Right
Lower Right
Lower Right
Lower Right
Lower Right
Lower Left
Lower Left
Lower Left
Lower Left
Flip State
0x45 + 0x55 =
0x9A + 0x06 =
0xA0 + 0x1B =
0xBB + 0xA5 =
0x60 + 0x08 =
0x68 + 0x13 =
0x7B + 0xDF =
0x5A + 0xF4 =
0x4E + 0x0B =
0x59 + 0x98 =
0xF1 + 0xE4 =
0xD5 + 0x1E =
0xF3 + 0xEC =
0xDF + 0xBF =
0x9E + 0x1A =
0xB8 + 0x32 =
0xEA + 0xE7 =
0xD1 + 0x01 =
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
Low byte
High byte
Low byte
High byte
Low byte
High byte
Low byte
High byte
Low byte
High byte
Low byte
High byte
Low byte
High byte
Low byte
High byte
Checksum
The Checksum is an 8-bit value calculated by
successive additions with overflow ignored, as shown
below.
Checksum = 0x45
For each of the 18 calibration values, starting at the
Block Key and ending with the Flip State
Checksum += Calibration value
Next Calibration value
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 47
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
10.2.2
EXECUTION OF FIXED
CALIBRATION VALUE LOADING
Follow error checking practices by checking the
AR1000 responses to issued commands.
1. Send the AR1000 DISABLE_TOUCHcommand.
2. Use the AR1000 EEPROM_WRITE command
multiple times to write the following to the
AR1000 EEPROM.
a. Block Key 0x55 to address 0x16
b. Data set to addresses 0x17:0x27. See
Section 9.3.4.3 “Calibration Data
Encoded and Stored in EEPROM” and
Section 9.3.12 “EEPROM Map”.
c. Checksum for the data block to address
0x28
d. Mirror image of a, b and c from above to
address 0x3E:0x50
3. Set the CCE bit of the TouchOptions register.
This will enable the controller to use the
calibration data on the next power boot. See
Section 10.2.3 “Configuring the CCE bit to
Use Fixed Calibration Values” for additional
details on the CCE bit.
4. Send the AR1000 ENABLE_TOUCH (0x12)
command.
10.2.3
CONFIGURING THE CCE BIT TO
USE FIXED CALIBRATION VALUES
The CCE bit of the TouchOptions Register (offset
0x0D) must be set to ‘1’ to enable the usage of the
stored calibration values in EEPROM.
This should be completed before re-enabling the
controller via the ENABLE_TOUCHcommand.
REGISTER 10-1: CCE BIT FORMAT
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R/W
48W
R/W
CCE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7-2
bit 1
Unimplemented: Read as ‘0’
48W: 4-Wire or 8-Wire Sensor Selection bit
1= Selects 8-wire Sensor Operating mode
0= Selects 4-wire Sensor Operating mode
bit 0
CCE: Calibrated Coordinates Enable bit
1= Enables calibrated coordinates, if the controller has been calibrated
0= Disables calibrated coordinates
DS41393B-page 48
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
1. Send the DISABLE_TOUCH(0x13) command.
10.2.5
QUALITY TEST
2. Send the
Although not required, a level of quality assurance can
be added to the process by the application issuing
multiple EEPROM_READcommands to the AR1000.
REGISTER_START_ADDRESS_REQUEST
(0x22) to determine the absolute address for
TouchOptions Register.
The response data from the EEPROM_READcommands
would be tested by the application against the
application’s desired data as a quality check.
3. Send the REGISTER_WRITE (0x21) command
to set the CCE bit of the TouchOptions Register.
4. Send REGISTERS_WRITE_TO_EEPROM (0x23)
command to have all current registers stored
into EEPROM.
10.2.6
EXAMPLE COMMAND SEQUENCE
An example eight command sequence for the entire
process is shown below.
5. Send the AR1000 ENABLE_TOUCH (0x12)
command.
All values shown are in hexadecimal.
The controller will use the stored calibration data after
cycling power to the controller.
Calibration values are applications specific and have
been symbolically represented as follows:
10.2.4
EEPROM_WRITECOMMAND TO
STORE DEFAULT CALIBRATION
ULxL = Upper Left corner x-coordinate Low byte
The EEPROM_WRITE command is shown in this
section. See Section 9.0 “Commands” for more
command details.
:
LLyH = Lower Left corner y-coordinate High byte
DISABLE_TOUCH
<> = application specific value
Send to AR1000:
0x55
0x<>
0x29
0x00
Header
Number of bytes to follow this one
Command ID
Desired EEPROM address to write high
byte. Always 0x00
0x<>
0x<>
Desired EEPROM address to write low
byte
Number of consecutive EEPROM
addresses to write (supports 0x01 to 0x08)
0x<>
0x<>
0x<>
0x<>
0x<>
0x<>
0x<>
0x<>
Value # 1 to write
Value # 2 to write, if applicable
Value # 3 to write, if applicable
Value # 4 to write, if applicable
Value # 5 to write, if applicable
Value # 6 to write, if applicable
Value # 7 to write, if applicable
Value # 8 to write, if applicable
Response from AR1000:
0x55
Header
0x02
0x00
0x29
Number of bytes to follow this one
Success response
Command ID
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 49
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Disable Touch
Command:
Response:
55
55
01 13
02 00 13
Write Calibration to EEPROM Image # 1
Command:
Response:
Command:
Response:
Command:
Response:
55 0C 29 00
55 02 00 29
55 0C 29 00 1E
16
08
08
03
55
ULxL ULxH ULyL ULyH URxL URxH URyL
LRxL LRxH LRyL LRyH LLxL LLxH LLyL
FlipS Chksm
URyH
LLyH
55
55
55
02 00 29
07 29 00
02 00 29
26
Write Calibration to EEPROM Image # 2
Command:
Response:
Command:
Response:
Command:
Response:
55 0C 29 00 3E
55 02 00 29
55 0C 29 00
08
08
03
55
ULxL ULxH ULyL ULyH URxL URxH URyL
LRxL LRxH LRyL LRyH LLxL LLxH LLyL
FlipS Chksm
46
URyH
LLyH
55
55
55
02 00 29
07 29 00 4E
02 00 29
Enable Use of Calibrated Data
Command:
Response:
Command:
4/8-Wire
55
55
01 22
03 00 22 <Start Address>
55
55
55
05 21 00 <Start Address + 0x0D>
05 21 00 <Start Address + 0x0D>
02 00 21
01
01
01
03
5-Wire
Response:
Enable Touch
Command:
Response:
55
55
01 12
02 00 12
DS41393B-page 50
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
11.0 ELECTRICAL SPECIFICATIONS
(†)
Absolute Maximum Ratings
Ambient temperature under bias....................................................................................................... -40°C to +125°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 to 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.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 51
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
11.1 Minimum Operating Voltage
The AR1000 series controller will operate down to 2.5V ± 5%. Touch performance will be optimized by using the high-
est allowable voltage for the design.
The PICkit Serial included in the AR1000 Development kit supports 3V-5V range of operation.
11.2 AR1000 Electrical Characteristics
Operating Voltage: 2.5 ≤ VDD ≤ 5.25V
Function
Pin
Input
Output
M1
M1
VSS ≤ VIL ≤ 0.15*VDD
(0.25*VDD + 0.9V) ≤ VIH ≤ VDD
—
—
—
M2
SCL/SCK
TX
M2
VSS ≤ VIL ≤ 0.15*VDD
(0.25*VDD + 0.9V) ≤ VIH ≤ VDD
SCL/SCK/TX
SCL/SCK/TX
SDI/SDA/RX
SDO
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
—
VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)
(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD
SDI
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
—
SDO
—
VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)
(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD
SIQ
SDA
RX
SIQ
—
VSS ≤ VOL(1) ≤ (1.2V – 0.15*VDD)(2)
(1.25*VDD – 2.25V)(3) ≤ VOH(1) ≤ VDD
SDI/SDA/RX
SDI/SDA/RX
SS
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
Open-drain
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
—
—
SS
VSS ≤ VIL ≤ 0.2*VDD
0.8*VDD ≤ VIH ≤ VDD
Note 1: These parameters are characterized but not tested.
2: At 10 mA.
3: At -4 mA.
DS41393B-page 52
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
12.0 PACKAGING INFORMATION
12.1 Package Marking Information
20-Lead SSOP (5.30 mm)
Example
AR1021
I/SS
e
3
1042256
20-Lead SOIC (7.50 mm)
Example
AR1021
I/SO
XXXXXXXXXXXX
XXXXXXXXXXXX
XXXXXXXXXXXX
e
3
1042256
YYWWNNN
Legend: XX...X Customer-specific information
Y
YY
WW
NNN
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
e
3
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.
)
e3
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.
*
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.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 53
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
12.2 Package Marking Information (Continued)
20-Lead QFN (4x4x0.9 mm)
Example
AR1021
I/ML
1042256
PIN 1
PIN 1
e
3
Legend: XX...X Customer-specific information
Y
Year code (last digit of calendar year)
YY
WW
NNN
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
e
3
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.
)
e3
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.
*
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.
DS41393B-page 54
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
12.3 Ordering
Note:
The AR1011/AR1021 are recommended
for new designs. The AR1010/AR1020 are
still supported and available, but are not
recommended for new designs.
TABLE 12-1: ORDERING PART NUMBERS
Communication
Part Number
Type
Temp. Range
Pin Package
Packing
AR1011-I/ML
AR1011-I/SO
AR1011-I/SS
AR1011T-I/ML
AR1011T-I/SO
AR1011T-I/SS
AR1021-I/ML
AR1021-I/SO
AR1021-I/SS
AR1021T-I/ML
AR1021T-I/SO
AR1021T-I/SS
UART
UART
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
Tube
Tube
Tube
T/R
UART
UART
UART
T/R
UART
T/R
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
Tube
Tube
Tube
T/R
T/R
T/R
AR1010-I/ML
AR1010-I/SO
AR1010-I/SS
AR1010T-I/ML
AR1010T-I/SO
AR1010T-I/SS
AR1020-I/ML
AR1020-I/SO
AR1020-I/SS
AR1020T-I/ML
AR1020T-I/SO
AR1020T-I/SS
UART
UART
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
-40°C to + 85°C
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
QFN, 20 pin
SOIC, 20 pin
SSOP, 20 pin
Tube
Tube
Tube
T/R
UART
UART
UART
T/R
UART
T/R
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
I2CTM/SPI
Tube
Tube
Tube
T/R
T/R
T/R
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 55
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
12.4
Package Details
The following sections give the technical details of the packages.
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DS41393B-page 56
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 57
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS41393B-page 58
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 59
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS41393B-page 60
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢉꢅꢊꢋꢌꢍꢇ%ꢕꢅꢆꢇ&ꢉꢅꢋ'ꢇ#ꢜꢇꢃꢄꢅꢆꢇꢈꢅꢍꢒꢅ(ꢄꢇꢖ)ꢃꢗꢇMꢇ*+*+ꢁꢙ,ꢇꢓꢓꢇꢛꢜꢆ ꢇ!%&#"
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2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 61
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
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DS41393B-page 62
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
APPENDIX A: DATA SHEET
REVISION HISTORY
Revision A (07/2009)
Original release of this data sheet.
Revision B (03/2012)
Updated data sheet.
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 63
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
APPENDIX B:
Modifying, removing or adding components may
adversely affect touch performance.
Specific manufacturers and part numbers are provided
only as a guide. Equivalents can be used.
TABLE B-1:
Label
BILL OF MATERIALS
Quantity Value
Description
Manufacturer
Part Number
C1
1
10 uF Capacitor – Ceramic, 10 uF, 20%, 6.3V,
X7R, 0603
AVX
06036D106MAT2A
C2
1
0.1 uF Capacitor – Ceramic, 0.1 uF, 10%, 16V,
X7R, 0603
AVX
AVX
NXP
0603YC104KAT2A
06035C103KAT2A
PESD5V0S1BA
C3, C4, C5(1)
D1-D8(2)
2-3
4-8
0.01 uF Capacitor – Ceramic, 0.01 uF, 10%,
50V, X7R, 0603
130W Diode – Bidirectional, 130W, ESD
Protection, SOD323
R1
U1
1
1
20 K Resistor – 20 K, 1/10W, 5%, 0603
Yageo America RC0603JR-0720KL
Microchip AR1011 or AR1021
N/A
Touch controller IC
Note 1: C5 is only needed for 5-wire applications.
2: D1-D8 are for ESD protection.
- 4-wire touch screen, use D1-D4
- 5-wire touch screen, use D1-D5
- 8-wire touch screen, use D1-D8
See Section 3.8 “ESD Considerations” and Section 3.9 “Noise Considerations” for important information
regarding the capacitance of the controller schematic hardware.
DS41393B-page 64
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
INDEX
Numerics
P
4, 5, 8-Wire Sensor Selection ............................................. 12
4-Wire Sensor ....................................................................... 7
4-Wire Touch Sensor Interface ........................................... 12
4-Wire Touch Sensor Interface ........................................... 12
5-Wire Sensor ..................................................................... 10
5-Wire Touch Sensor Interface ........................................... 13
8-Wire Sensor ....................................................................... 9
8-Wire Touch Sensor Interface ........................................... 14
Packaging........................................................................... 53
Marking................................................................. 53, 54
Power Requirements............................................................ 3
R
Reader Response............................................................... 68
Register Descriptions.......................................................... 30
Restoring Default Parameters ............................................ 29
Revision History.................................................................. 63
A
S
Absolute Maximum Ratings ................................................ 51
Addressing .......................................................................... 18
Application Notes................................................................ 45
Applications........................................................................... 5
AR1011/AR1021 Storing Default Calibration Values
Sending Commands ........................................................... 35
Sleep State ......................................................................... 20
Special Features................................................................... 3
SPI Bit Timing - General..................................................... 23
SPI Communications .......................................................... 21
SPI Hardware Interface ...................................................... 21
SPI Pin Voltage Level Characteristics ................................ 22
Status LED ......................................................................... 15
to EEPROM ................................................................ 47
AR1020 Write Conditions.................................................... 19
B
Basics ................................................................................... 7
Basics of Resistive Sensors.................................................. 7
T
Terminology.......................................................................... 7
Timing – Bit Details............................................................. 24
Touch Modes........................................................................ 3
Touch Report Protocol........................................................ 20
Touch Report Protocol........................................................ 22
Touch Reporting Protocol................................................... 27
Touch Resolution.................................................................. 3
Touch Sensor Support.......................................................... 3
C
Calibration of Touch Sensor with Controller ....................... 45
Clock Stretching.................................................................. 19
Command Protocol ............................................................. 20
Commands.......................................................................... 35
Communication................................................................... 17
Communications ................................................................... 3
Configuration Registers ................................................ 25, 29
Customer Change Notification Service ............................... 67
Customer Notification Service............................................. 67
Customer Support............................................................... 67
U
UART Communications ...................................................... 25
W
D
Wake Pin ............................................................................ 15
WWW Address ................................................................... 67
WWW, On-Line Support ....................................................... 4
Data Flow............................................................................ 22
Device Overview ................................................................... 5
E
Electrical Specifications ...................................................... 51
Errata .................................................................................... 4
G
General ................................................................................. 7
H
Hardware ............................................................................ 11
I
I2C Hardware Interface....................................................... 17
I2C Pin Voltage Level Characteristics................................. 18
Internet Address.................................................................. 67
M
Main Schematic .................................................................. 11
Master Read Bit Timing ...................................................... 18
Master Write Bit Timing....................................................... 19
Microchip Internet Web Site................................................ 67
N
Noise Considerations.......................................................... 15
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 65
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
NOTES:
DS41393B-page 66
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
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DS41393B-page 67
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
READER RESPONSE
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DS41393B-page 68
Preliminary
2009-2012 Microchip Technology Inc.
AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
NOTES:
2009-2012 Microchip Technology Inc.
Preliminary
DS41393B-page 69
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Fax: 86-23-8980-9500
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Korea - Seoul
China - Hangzhou
Tel: 86-571-2819-3187
Fax: 86-571-2819-3189
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Cleveland
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
Los Angeles
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-330-9305
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
China - Xiamen
Tel: 905-673-0699
Fax: 905-673-6509
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
11/29/11
DS41393B-page 70
Preliminary
2009-2012 Microchip Technology Inc.
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