CAP1203 Datasheet, PDF (39/59 Pages) Microchip Technology – 3-Channel Capacitive Touch Sensor

5.19 Sensor Input Noise Threshold Register
TABLE 5-33: SENSOR INPUT NOISE THRESHOLD REGISTER
Addr
R/W
Register
B7
B6
B5
B4
B3
B2
B1
B0
Default
38h
R/W
Sensor Input
Noise Threshold
-
-
-
-
-
-
CS_BN_TH
[1:0]
01h
The Sensor Input Noise Threshold register controls the value of a secondary internal threshold to detect noise and
improve the automatic recalibration routine. If a capacitive touch sensor input exceeds the Sensor Input Noise Threshold
but does not exceed the sensor input threshold, it is determined to be caused by a noise spike. That sample is not used
by the automatic recalibration routine. This feature can be disabled by setting the DIS_DIG_NOISE bit.
Bits 1-0 - CS1_BN_TH[1:0] - Controls the noise threshold for all capacitive touch sensor inputs, as shown in Table 5-34.
The threshold is proportional to the threshold setting.
TABLE 5-34: CSX_BN_TH BIT DECODE
CS_BN_TH[1:0]
1
0
0
0
0
1
1
0
1
1
5.20 Standby Channel Register
Percent Threshold Setting
25%
37.5% (default)
50%
62.5%
TABLE 5-35: STANDBY CHANNEL REGISTER
Addr
R/W
40h
R/W
Register
Standby
Channel
B7
B6
B5
B4
B3
B2
B1
B0
Default
-
-
-
-
-
CS3_ CS2_ CS1_
STBY STBY STBY
00h
The Standby Channel register controls which (if any) capacitive touch sensor inputs are enabled in Standby (see Section
4.3.1.2, "Standby State Sensing Settings").
For all bits in this register:
• ‘0’ (default) - The specified channel will not be monitored in Standby.
• ‘1’ - The specified channel will be monitored in Standby. It will use the standby threshold setting, and the standby
averaging and sensitivity settings.
Bit 2 - CS3_STBY - Controls whether the CS3 channel is enabled in Standby.
Bit 1 - CS2_STBY - Controls whether the CS2 channel is enabled in Standby.
Bit 0 - CS1_STBY - Controls whether the CS1 channel is enabled in Standby.
 2013-2015 Microchip Technology Inc.
DS00001572B-page 39