AR1011-ISLASHSS datasheet(49/70 Pages) MICROCHIP

49 / 70 page

 2009-2012 Microchip Technology Inc.

Preliminary

DS41393B-page 49

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

Send the DISABLE_TOUCH (0x13) command.

Send the

REGISTER_START_ADDRESS_REQUEST

(0x22) to determine the absolute address for

TouchOptions Register.

Send the REGISTER_WRITE (0x21) command

to set the CCE bit of the TouchOptions Register.

Send REGISTERS_WRITE_TO_EEPROM (0x23)

command to have all current registers stored

into EEPROM.

Send the AR1000 ENABLE_TOUCH (0x12)

command.

The controller will use the stored calibration data after

cycling power to the controller.

10.2.4

EEPROM_WRITE COMMAND TO

STORE DEFAULT CALIBRATION

The EEPROM_WRITE command is shown in this

section. See Section 9.0 “Commands” for more

command details.

10.2.5

QUALITY TEST

Although not required, a level of quality assurance can

be added to the process by the application issuing

multiple EEPROM_READ commands to the AR1000.

The response data from the EEPROM_READ commands

would be tested by the application against the

application’s desired data as a quality check.

10.2.6

EXAMPLE COMMAND SEQUENCE

An example eight command sequence for the entire

process is shown below.

All values shown are in hexadecimal.

Calibration values are applications specific and have

been symbolically represented as follows:

<> = application specific value

Send to AR1000:

0x55

Header

0x<>

Number of bytes to follow this one

0x29

Command ID

0x00

Desired EEPROM address to write high

byte. Always 0x00

0x<>

Desired EEPROM address to write low

byte

0x<>

Number of consecutive EEPROM

addresses to write (supports 0x01 to 0x08)

0x<>

Value # 1 to write

0x<>

Value # 2 to write, if applicable

0x<>

Value # 3 to write, if applicable

0x<>

Value # 4 to write, if applicable

0x<>

Value # 5 to write, if applicable

0x<>

Value # 6 to write, if applicable

0x<>

Value # 7 to write, if applicable

0x<>

Value # 8 to write, if applicable

Response from AR1000:

0x55

Header

0x02

Number of bytes to follow this one

0x00

Success response

0x29

Command ID

ULxL = Upper Left corner x-coordinate Low byte

LLyH = Lower Left corner y-coordinate High byte

DISABLE_TOUCH

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