STMPE321 ST Microelectronics, STMPE321 Datasheet - Page 30

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

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Capacitive touch module registers
TVR
Address:
Type:
Reset:
Description:
EVR
Address:
Type:
Reset:
Description:
30/40
RESERVED
RESERVED
7
7
[6:0] TVR:
[7] RESERVED
[7] RESERVED
[6] EVR:
6
6
0X30 - 0x32
R/W
0x08
Touch variance setting
Setting TVR between 0-99
A high TVR value decreases sensitivity of the sensor, but increases its tolerance to ambient
noise
A small TVR value increases the sensitivity
0x40
R/W
0x04
Environmental variance setting.
EVR is used to detect "Non-Touch" condition
5
5
4
4
Doc ID 15791 Rev 1
3
3
TVR
TVR
2
2
Environmental variance
Touch variance setting
1
1
STMPE321
0
0