AR1011-ISLASHML datasheet(25/61 Pages) MICROCHIP

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DS40001393C-page 25

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

8.2

8.2.1

TouchThreshold Register (OFFSET

0x02)

The TouchThreshold register sets the threshold for a

touch condition to be detected as a touch. A touch is

detected if it is below the TouchThreshold setting. Too

small of a value might prevent the controller from

accepting a real touch, while too large of a value might

allow the controller to accept very light or false touch

conditions. Valid values are as follows:

0 ≤ TouchThreshold ≤ 255

8.2.2

SensitivityFilter Register (OFFSET

0x03)

The SensitivityFilter register sets the level of touch

sensitivity. A higher value is more sensitive to a touch

(accepts a lighter touch), but may exhibit a less stable

touch position. A lower value is less sensitive to a touch

(requires a harder touch), but will provide a more stable

touch position. Valid values are as follows:

0 ≤ SensitivityFilter ≤ 10

8.2.3

SamplingFast Register (OFFSET

0x04)

The SamplingFast register sets the level of touch

measurement

sample

averaging,

when

touch

movement is determined to be fast. See the

SpeedThreshold register for information on the touch

movement threshold. A lower value will provide for a

higher touch coordinate reporting rate when touch

movement is fast, but may exhibit more high-frequency

random noise error in the touch position. A higher value

will reduce the touch coordinate reporting rate when

touch movement is fast, but will reduce high-frequency

random noise error in the touch position. Valid values

are as follows:

SamplingFast: <1, 4, 8, 16, 32, 64, 128>

Recommended Values: <4, 8, 16>

Higher values may improve accuracy with some

sensors.

8.2.4

SamplingSlow Register (OFFSET

0x05)

The SamplingSlow register sets the level of touch

measurement

sample

averaging,

when

touch

movement is slow. See the SpeedThreshold register for

information on the touch movement threshold. A lower

value will increase the touch coordinate reporting rate

when the touch motion is slow, but may exhibit a less

stable more jittery touch position. A higher value will

decrease the touch coordinate reporting rate when the

touch motion is slow, but will provide a more stable

touch position. Valid values are as follows:

SamplingSlow: 1, 2, 4, 8, 16, 32, 64, 128

8.2.5

AccuracyFilterFast Register (OFFSET

0x06)

The AccuracyFilterFast register sets the level of an

accuracy enhancement filter, used when the touch

movement is fast. See the SpeedThreshold register for

information on the touch movement threshold. A lower

value will provide better touch coordinate resolution

when the touch motion is fast, but may exhibit more

low-frequency noise error in the touch position. A

higher value will reduce touch coordinate resolution

when the touch motion is fast, but will reduce low-

frequency random noise error in the touch position.

Valid values are as follows:

1 ≤ AccuracyFilterFast ≤ 8

Higher values may improve accuracy with some

sensors.

8.2.6

AccuracyFilterSlow Register

(OFFSET 0x07)

The AccuracyFilterSlow register sets the level of an

accuracy enhancement filter, used when the touch

movement is slow. See the SpeedThreshold register for

information on the touch movement threshold. A lower

value will provide better touch coordinate resolution

when the touch motion is slow, but may exhibit more

low-frequency noise error in the touch position. A

higher value will reduce touch coordinate resolution

when the touch motion is slow, but will reduce low-

frequency random noise error in the touch position.

Valid values are as follows:

1 ≤ AccuracyFilterSlow ≤ 8

8.2.7

SpeedThreshold Register (OFFSET

0x08)

The SpeedThreshold register sets the threshold for

touch movement to be considered as slow or fast. A

lower value reduces the touch movement speed that

will be considered as fast. A higher value increases the

touch movement speed that will be considered as fast.

Valid values are as follows:

0 ≤ SpeedThreshhold ≤ 255

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