AR1010-ISLASHML datasheet(46/70 Pages) MICROCHIP

46 / 70 page

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

DS41393B-page 46

Preliminary

 2009-2012 Microchip Technology Inc.

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.

FIGURE 10-3:

SUGGESTED TEXT FOR

THIRD CALIBRATION

TARGET

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

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

• 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

issuing

ENABLE_TOUCH command.

Send:

<0x55><0x01><0x12>

Receive: <0x55><0x02><Response><0x12>

Touch and

Release Target

Touch and

Release Target

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