CAP1128 datasheet(47/75 Pages) MICROCHIP

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DS00001622B-page 47

CAP1128

6.20

Standby Channel Register

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

Bit 7 - CS8_STBY - Controls whether the CS8 channel is active in Standby.

• ‘0’ (default) - The CS8 channel not be sampled during Standby.

• ‘1’ - The CS8 channel will be sampled during Standby. It will use the Standby threshold setting, and the standby

averaging and sensitivity settings.

Bit 6 - CS7_STBY - Controls whether the CS7 channel is active in Standby.

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

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

a physical touch will overflow the delta count registers and may result in false readings.

Bits 6 - 4 - STBY_AVG[2:0] - Determines the number of samples that are taken for all active channels during the sensor

cycle as shown in Table 6-37. All samples are taken consecutively on the same channel before the next channel is sam-

pled and the result is averaged over the number of samples measured before updating the measured results.

TABLE 6-35:

STANDBY CHANNEL REGISTER

ADDR

R/W

Default

40h

R/W

Standby Channel

CS8_

STBY

CS7_

STBY

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

TABLE 6-37:

STBY_AVG BIT DECODE

STBY_AVG[2:0]

Number of Samples Taken per

Measurement

8 (default)

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