AR1000 Datasheet, PDF(3/37 Page) Microchip Technology – Resistive Touch Screen Controller

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AR1000 Datasheet, PDF (3/37 Pages) Microchip Technology – Resistive Touch Screen Controller

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TABLE OF CONTENTS

1 GENERAL.............................................................................................................................................. 1

2 FEATURES............................................................................................................................................ 1

3 APPLICATIONS..................................................................................................................................... 2

4 ORDERING............................................................................................................................................ 2

5 BLOCK DIAGRAM ................................................................................................................................. 2

6 PIN DIAGRAM ....................................................................................................................................... 3

7 FUNCTIONAL DESCRIPTION .............................................................................................................. 4

7.1 MAIN SCHEMATIC..............................................................................................................................................4

7.2 BILL OF MATERIALS ...........................................................................................................................................4

7.3 4, 5, 8-WIRE SENSOR SELECTION ......................................................................................................................5

7.4 4-WIRE TOUCH SENSOR INTERFACE....................................................................................................................5

7.5 5-WIRE TOUCH SENSOR INTERFACE....................................................................................................................6

7.6 8-WIRE TOUCH SENSOR INTERFACE....................................................................................................................7

7.7 COMMUNICATION INTERFACE..............................................................................................................................8

7.7.1 I2C............................................................................................................................................ 8

7.7.2 SPI........................................................................................................................................... 9

7.7.3 UART..................................................................................................................................... 10

7.8 STATUS LED..................................................................................................................................................10

7.9 ESD CONSIDERATIONS ...................................................................................................................................11

7.10 NOISE CONSIDERATIONS .................................................................................................................................11

7.11 TOUCH REPORTING PROTOCOL ........................................................................................................................11

7.12 CONFIGURATION REGISTERS............................................................................................................................12

7.12.1 TouchThreshold Register (offset 0x02)................................................................................. 12

7.12.2 SensitivityFilter Register (offset 0x03)................................................................................... 12

7.12.3 SamplingFast Register (offset 0x04)..................................................................................... 13

7.12.4 SamplingSlow Register (offset 0x05) .................................................................................... 13

7.12.5 AccuracyFilterFast Register (offset 0x06) ............................................................................. 13

7.12.6 AccuracyFilterSlow Register (offset 0x07) ............................................................................ 13

7.12.7 SpeedThreshold Register (offset 0x08) ................................................................................ 13

7.12.8 SleepDelay Register (offset 0x0A) ........................................................................................ 14

7.12.9 PenUpDelay Register (offset 0x0B) ...................................................................................... 14

7.12.10 TouchMode Register (offset 0x0C).................................................................................... 15

7.12.11 TouchOptions Register (offset 0x0D) ................................................................................ 16

7.12.12 CalibrationInset Register (offset 0x0E).............................................................................. 16

7.12.13 PenStateReportDelay Register (offset 0x0F) .................................................................... 17

7.12.14 TouchReportDelay Register (offset 0x11) ......................................................................... 17

7.12.15 User Configuration â Spiking ............................................................................................. 17

7.13 COMMAND FORMAT.........................................................................................................................................17

7.14 COMMAND RESPONSE .....................................................................................................................................18

7.15 COMMANDS ....................................................................................................................................................18

7.15.1 Enable Touch - 0x12 ............................................................................................................. 18

7.15.2 Disable Touch - 0x13 ............................................................................................................ 18

7.15.3 Calibrate - 0x14 ..................................................................................................................... 19

7.15.3.1 How the Calibration Data is Encoded and Stored in EEPROM ..................................... 20

7.15.4 Register Read - 0x20 ............................................................................................................ 21

7.15.5 Register Write - 0x21............................................................................................................. 21

7.15.6 Register Start Address Request - 0x22................................................................................. 21

7.15.7 Registers Write to EEPROM - 0x23 ...................................................................................... 21

7.15.8 EEPROM Read - 0x28 .......................................................................................................... 22

7.15.9 EEPROM Write - 0x29 .......................................................................................................... 22

7.15.10 EEPROM Write to Registers - 0x2B .................................................................................. 22

7.16 CALIBRATION OF TOUCH SENSOR WITH CONTROLLER ......................................................................................... 23

DS41393A-Page iii

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