AR1010-ISLASHML datasheet(48/70 Pages) MICROCHIP

48 / 70 page

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

DS41393B-page 48

Preliminary

 2009-2012 Microchip Technology Inc.

10.2.2

EXECUTION OF FIXED

CALIBRATION VALUE LOADING

Follow error checking practices by checking the

AR1000 responses to issued commands.

Send the AR1000 DISABLE_TOUCH command.

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

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.

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_TOUCH command.

CCE BIT FORMAT

U-0

R/W

—

48W

CCE

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

bit 7-2

Unimplemented: Read as ‘0’

bit 1

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

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