CAP1203 datasheet(39/59 Pages) MICROCHIP

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DS00001572B-page 39

5.19

Sensor Input Noise Threshold Register

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.

5.20

Standby Channel Register

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.

TABLE 5-33:

SENSOR INPUT NOISE THRESHOLD REGISTER

Addr

R/W

B5B4

B3B2

B1B0

Default

38h

R/W

Sensor Input

Noise Threshold

CS_BN_TH

[1:0]

01h

TABLE 5-34:

CSX_BN_TH BIT DECODE

CS_BN_TH[1:0]

Percent Threshold Setting

25%

37.5% (default)

50%

62.5%

TABLE 5-35:

STANDBY CHANNEL REGISTER

Addr

R/W

B5B4

B3B2

B1B0

Default

40h

R/W

Standby

Channel

CS3_

STBY

CS2_

STBY

CS1_

STBY

00h

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