CY8C20121 CYPRESS [Cypress Semiconductor], CY8C20121 Datasheet - Page 15

• Manufacturer Part Number: CY8C20121
• Description: CapSense Express-One Button and Two Button Capacitive Controllers
• Manufacturer: CYPRESS [Cypress Semiconductor]

7.12 CS_DEBOUNCE
CS_DEBOUNCE: 53h
The Debounce parameter adds a debounce counter to the ‘sensor active transition’. For the sensor to transition from inactive to active,
the consecutive samples of difference count value must stay above the ‘finger threshold + hysteresis’ for the number specified. This
parameter is common for all sensors.
Possible values are 1 to 255. A setting of ‘1’ provides no debouncing.
7.13 CS_NEG_NOISE_TH
CS_NEG_NOISE_TH: 54h
This parameter adds a negative difference count threshold. If the current raw count is below the baseline and the difference between
them is greater than this threshold, the baseline is not updated. However, if the current raw count stays in the low state (difference
greater than the threshold) for the number of samples specified by the Low Baseline Reset parameter, the baseline is reset. This
parameter is common for all sensors.
7.14 CS_LOW_BL_RST
CS_LOW_BL_RST: 55h
This parameter works together with the Negative Noise Threshold parameter. If the sample count values are below the baseline minus
the negative noise threshold for the specified number of samples, the baseline is set to the new raw count value. It essentially counts
the number of abnormally low samples required to reset the baseline. It is generally used to correct the finger-on-at-startup condition.
This parameter is common for all sensors.
Document Number: 001-53516 Rev. **
Bit
7:0
Bit
7:0
Bit
7:0
Access: FD
Access: FD
1/2 Button
1/2 Button
Access: FD
Bit Name
Bit Name
1/2 Button
Bit Name
Debounce Register.
Negative Noise Threshold Register
Low Baseline Reset Register
Name
DB [7:0]
Name
NNT [7:0]
Name
LBR [7:0]
7
7
7
6
6
6
5
PRELIMINARY
5
5
These bits are used to set the debounce value.
These bits are used to set the negative noise value.
These bits are used to set the Low Baseline Reset value.
Description
Description
Description
4
4
4
LBR[7:0]
RW:0A
DB[7:0]
RW:0A
NNT[7:0]
RW:0A
3
3
3
2
CY8C20111, CY8C20121
2
2
1
1
1
0
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0
0
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