STMPE321 ST Microelectronics, STMPE321 Datasheet - Page 25

• Manufacturer Part Number: STMPE321
• Description: 3-channel capacitive touch key controller
• Manufacturer: ST Microelectronics

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STMPE321
FEATURE_SELECT
Address:
Type:
Reset:
Description:
ETC_WAIT
Address:
Type:
Reset:
Description:
7
7
[7:3] RESERVED
[2:1] AFS[1:0]:
[7:0] ETC_WAIT[7:0]:
[0] Filter EN:
6
6
0x20
R/W
0x04
Controls AFS (advanced filtering system and second level filtering feature)
“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)
Write '1' to enable filter
0x21
R/W
0x27
Sets the wait time between the calibration and the last button touch
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
RESERVED
5
5
4
4
Doc ID 15791 Rev 1
ETC_WAIT[7:0]
3
3
2
2
Capacitive touch module registers
AFS[1:0]
1
1
Wait time setting
Feature select
Filter EN
0
0
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