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STMPE821 Datasheet(PDF) 34 Page - STMicroelectronics

Part # STMPE821
Description  8-bit Xpander Logic??with touchkey controller
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPE821 Datasheet(HTML) 34 Page - STMicroelectronics

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Capacitive touch module registers
STMPE821
34/55
TVR
Touch variance setting
Address:
0X30 - 0x3B
Type:
R/W
Reset:
0x08
Description:
Touch variance setting.
7654
3
2
1
0
RESERVED
TVR
[7] RESERVED
[6:0] TVR:
Setting TVR between 0-99
A high TVR value decreases sensitivity of the sensor, but increasing its tolerance to ambient
noise
A small TVR value increases the sensitivity.



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