STMPE1208S datasheet(21/51 Pages) STMICROELECTRONICS

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STMPE1208S

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FEATURE_SEL

Feature selection register

Address:

0x00

Type:

R/W

Reset:

0x04

Description:

The feature selection register is used to select the AFS mode and filter enable

TVR

Touch variance register [0-11]

Address:

0x01 - 0x0C

Type:

R/W

Reset:

0x08

Description:

Setting the TVR between 0 - 99

A high TVR value decreases the sensitivity of the sensor, but increasing its tolerance

to ambient noise. A small TVR value increases the sensitivity.

Each step of TVR is equivalent to a capacitance of 60 fF

Recommended value to TVR is 4-8.

7654

RESERVED

AFS3

AFS2

AFS1

FILTER_EN

[7:4] RESERVED

[3] AFS3: write '1' to enable AFS mode 3 (two strongest keys only)

[2] AFS2: write '1' to enable AFS mode 2 (all keys above threshold)

[1] AFS1: write '1' to enable AFS mode 1 (one strongest key only)

[0] FILTER_EN: write '1' to enable filter feature

Note: only one bit among AFS1, AFS2, AFS3 could be set to '1' at the same time. If more than

one are set to '1', results of the operation would be unpredictable.

7654

TVR

[6:0]

[7] RESERVED

[6:0] TVR [6:0]

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