CAP1293 datasheet(43/63 Pages) MICROCHIP

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DS00001566B-page 43

CAP1293

5.21

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.

5.22

Standby Configuration Register

The Standby Configuration register controls averaging and sensing cycle time for sensor inputs enabled in Standby. This

maintain normal functionality in the Active state.

Bit 7 - AVG_SUM - Determines whether the sensor inputs enabled in Standby will average the programmed number of

samples or whether they will accumulate for the programmed number of samples.

• ‘0’ - (default) - The Standby enabled sensor input delta count values will be based on the average of the pro-

grammed number of samples when compared against the threshold.

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

number of samples when compared against the threshold. Caution should be used with this setting as a touch

may 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 Standby enabled channels during

the sensing cycle as shown in Table 5-40. All samples are taken consecutively on the same channel before the next

channel is sampled and the result is averaged over the number of samples measured before updating the measured

results.

TABLE 5-38:

STANDBY CHANNEL REGISTER

Addr

R/W

B5B4

B3B2

B1B0

Default

40h

R/W

Standby

Channel

CS3_

STBY

CS2_

STBY

CS1_

STBY

00h

TABLE 5-39:

STANDBY CONFIGURATION REGISTER

Addr

R/W

Default

41h

R/W

Standby

Configuration

AVG_

SUM

STBY_AVG[2:0]

STBY_SAMP_

TIME[1:0]

STBY_CY_TIME

[1:0]

39h

TABLE 5-40:

STBY_AVG BIT DECODE

STBY_AVG[2:0]

Number Of Samples Taken Per

Measurement

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