CAP1126 datasheet(45/73 Pages) MICROCHIP

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DS00001623B-page 45

CAP1126

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 re-calibration 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 6-34.

The threshold is proportional to the threshold setting.

6.20

Standby Channel Register

The Standby Channel register controls which (if any) capacitive touch sensor inputs are active during Standby.

Bit 5 - CS6_STBY - Controls whether the CS6 channel is active in Standby.

• ‘0’ (default) - The CS6 channel not be sampled during Standby mode.

• ‘1’ - The CS6 channel will be sampled during Standby Mode. It will use the Standby threshold setting, and the

standby averaging and sensitivity settings.

Bit 4 - CS5_STBY - Controls whether the CS5 channel is active in Standby.

Bit 3 - CS4_STBY - Controls whether the CS4 channel is active in Standby.

Bit 2 - CS3_STBY - Controls whether the CS3 channel is active in Standby.

Bit 1 - CS2_STBY - Controls whether the CS2 channel is active in Standby.

Bit 0 - CS1_STBY - Controls whether the CS1 channel is active in Standby.

6.21

Standby Configuration Register

The Standby Configuration register controls averaging and cycle time for those sensor inputs that are active in Standby.

This register is useful for detecting proximity on a small number of sensor inputs as it allows the user to change aver-

aging and sample times on a limited number of sensor inputs and still maintain normal functionality in the fully active

state.

Bit 7 - AVG_SUM - Determines whether the active sensor inputs will average the programmed number of samples or

whether they will accumulate for the programmed number of samples.

• ‘0’ - (default) - The active sensor input delta count values will be based on the average of the programmed number

of samples when compared against the threshold.

• ‘1’ - The active sensor input delta count values will be based on the summation of the programmed number of

samples when compared against the threshold. This bit should only be set when performing proximity detection as

TABLE 6-34:

CSX_BN_TH BIT DECODE

CS_BN_TH[1:0]

Percent Threshold Setting

25%

37.5% (default)

50%

62.5%

TABLE 6-35:

STANDBY CHANNEL REGISTER

ADDR

R/W

Default

40h

R/W

Standby Channel

CS6_

STBY

CS5_

STBY

CS4_

STBY

CS3_

STBY

CS2_

STBY

CS1_

STBY

00h

TABLE 6-36:

STANDBY CONFIGURATION REGISTER

ADDR

R/W

Default

41h

R/W

Standby Config-

uration

AVG_

SUM

STBY_AVG[2:0]

STBY_SAMP_

TIME[1:0]

STBY_CY_TIME

[1:0]

39h

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