AR1011-ISLASHML datasheet(37/61 Pages) MICROCHIP

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DS40001393C-page 37

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

9.3.10

EEPROM_WRITE

– 0x29

The controller has 256 bytes of on-board EEPROM.

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

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 second 128 bytes (address range

0x80-0xFF) are provided for the user’s

application, if desired.

Write to EEPROM as follows:

Send: <0x55><0x04

EEPROM

Write><0x29><EEPROM

Address

High

byte><EEPROM Address Low byte>

EEPROM

Write><Data>…<Data>

# of Registers to Read: 0x01 thru 0x08

Receive: <0x55><0x02><Response><0x29>

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.

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

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>

9.3.12

EEPROM MAP

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.

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.

Warning

: ONLY write to user EEPROM addresses of

0x80-0xFF.

One of the following actions is required for

EEPROM changes to be used by the

controller:

• The controller power must be cycled

from OFF to ON or

• Issue the EEPROM_WRITE_TO_REG-

ISTERS

command.

TABLE 9-6:

AR1010/AR1020 EEPROM

AND REGISTER MAP

EEPROM Address

Function

0x00

0x01

0x02

0x03

Touch Threshold

0x04

Sensitivity Filter

0x05

Sampling Fast

0x06

Sampling Slow

0x07

Accuracy Filter Fast

0x08

Accuracy Filter Slow

0x09

Speed Threshold

0x0A

0x0B

Sleep Delay

0x0C

Pen-Up Delay

0x0D

Touch Mode

0x0E

Touch Options

0x0F

Calibration Inset

0x10

Pen State Report Delay

0x11

0x12

Touch Report Delay

0x13

0x14

Data Block Separator

0x15

Calibration UL X-low

0x16

Calibration UL X-high

0x17

Calibration UL Y-low

0x18

Calibration UL Y-high

0x19

Calibration UR X-low

0x1A

Calibration UR X-high

0x1B

Calibration UR Y-low

0x1C

Calibration UR Y-high

0x1D

Calibration LR X-low

0x1E

Calibration LR X-high

0x1F

Calibration LR Y-low

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