AR1011-ISLASHML datasheet(28/61 Pages) MICROCHIP

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AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

DS40001393C-page 28

 2009-2016 Microchip Technology Inc.

8.2.11

TouchOptions Register (OFFSET

0x0D)

The TouchOptions register contains various “touch”

related option bits.

8.2.12

CalibrationInset Register (OFFSET

0x0E)

The CalibrationInset register defines the expected

position of the calibration points, inset from the

perimeter of the touch sensor’s active area, by a

percentage of the full scale dimension.

This allows for the calibration targets to be placed inset

from edge to make it easier for a user to touch them.

The CalibrationInset register value is only used when

the CALIBRATION_MODE command is issued to the

controller. In Calibration mode, the controller will

extrapolate the calibration point touch report values by

the defined CalibrationInset percentage to achieve full

scale.

software

application

that

issues

the

CALIBRATION_MODE

command must present the

displayed calibration targets at the same inset

percentage as defined in this CalibrationInset register.

Valid values are as follows:

0 ≤ CalibrationInset ≤ 40

Calibration Inset = (CalibrationInset/2) %, Range of 0-

20% with 0.5% resolution

For example, CalibrationInset = 25 (0x19) yields a

calibration inset of (25/2) or 12.5%. During the

calibration procedure, the controller will internally

extrapolate the calibration point touch values in

Calibration mode by 12.5% to achieve full scale.

FIGURE 8-1:

CALIBRATION TARGET

EXAMPLE

TouchOptions REGISTER

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

= Selects 8-wire Sensor Operating mode

= Selects 4-wire Sensor Operating mode

bit 0

CCE:

Calibrated Coordinates Enable bit

= Enables calibrated coordinates, if the controller has been calibrated

= Disables calibrated coordinates

Note:

A 4-wire touch sensor will not work if the

48W Configuration bit is incorrectly

defined as 1, which selects 8-wire.

An 8-wire touch sensor will provide basic

operation if the 48W Configuration bit is

incorrectly defined as 0, which selects 4-

wire. However, the benefit of the 8-wire

sensor will only be realized if the 48W

Configuration bit is correctly defined as 1,

selecting 8-wire.

Location of Calibration

Targets presented during

Calibration.

12.5% of

Full Scale

12.5% of

Full Scale

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