STMPE321 datasheet(25/40 Pages) STMICROELECTRONICS

Part #	STMPE321

Description	3-channel capacitive touchkey controller

PDF	40 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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25 / 40 page

STMPE321

Capacitive touch module registers

Doc ID 15791 Rev 3

25/40

FEATURE_SELECT

Feature select

Address:

0x20

Type:

R/W

Reset:

0x04

Description:

Controls AFS (advanced filtering system and second level filtering feature)

ETC_WAIT

Wait time setting

Address:

0x21

Type:

R/W

Reset:

0x27

Description:

Sets the wait time between the calibration and the last button touch

543

RESERVED

AFS[1:0]

Filter EN

[7:3] RESERVED

[2:1] AFS[1:0]:

“00’: reserved

“01’ AFS mode 1 (only 1 strongest key)

‘10’: AFS mode 2 (all keys that are above threshold)

‘11’: AFS mode 3 (the 2 strongest keys)

[0] Filter EN:

Write '1' to enable filter

543

ETC_WAIT[7:0]

[7:0] ETC_WAIT[7:0]:

ETC wait time = ETC_Wait[7:0] *64 + sensor clock period

A "non-touch" condition must persist for this wait time, before an ETC operation is carried out

Range: 5 mS - 20 s

STMPE321 Datasheet(PDF) 25 Page - STMicroelectronics

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