STMPE321 datasheet(29/40 Pages) STMICROELECTRONICS

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STMPE321

Capacitive touch module registers

Doc ID 15791 Rev 3

29/40

FILTER_PERIOD

Filter period

Address:

0x28

Type:

R/W

Reset:

0x00

Description:

Filter period.

FILTER_THRESHOLD

Filter threshold

Address:

0x29

Type:

R/W

Reset:

0x00

Description:

Filter threshold.

REFERENCE_DELAY

Reference delay

Address:

0x2A

Type:

R/W

Reset:

0x00

Description:

Shifting of capacitive sensor dynamic range. The capacitance value set into this

543

FILTER_COUNT

[7:0] FILTER_COUNT:

Additional filter to stabilize touch output in AFS mode.

AFS touch output is monitored for Filter Count [7:0] times every integration time. For each time

a "touch status" is detected, an internal "Filter Counter" is incremented once. This counter

value is then compared with Filter Threshold (register 0x29).

543

FILTER_THRESHOLD

[7:0] FILTER_THRESHOLD:

An internal "Filter Counter" is compared with Filter Threshold [7:0] to determine if a valid touch

has occurred.

543

RESERVED

REFERENCE_DELAY

[7] RESERVED

[6:0] REFERENCE_DELAY:

Valid range = 0-127

Each step represents capacitance value of 0.04 pF

Warm reset is required after this value is updated

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