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STMPE821 Datasheet(PDF) 33 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) 33 Page - STMicroelectronics

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STMPE821
Capacitive touch module registers
33/55
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
register is in effect, equivalent to capacitor connected to the S_Ref pin.
7654
3
2
1
0
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.
7654
3
2
1
0
RESERVED
REFERENCE_DELAY
[7] RESERVED
[6:0] REFERENCE_DELAY:
Valid range = 0-127
Each step represents capacitance value of 0.06 pF
Warm reset is required after this value is updated



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