CAP1208 datasheet(52/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

DS00001570B-page 52

 2014 Microchip Technology Inc.

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 5.37. 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.

Bit 3 - 2 - STBY_SAMP_TIME[1:0] - Determines the time to take a single sample for sensor inputs

enabled in Standby as shown in Table 5.38.

Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the desired sensing cycle time for sensor inputs enabled

during Standby, as shown in Table 5.39. All enabled channels are sampled at the beginning of the

sensing cycle. If additional time is remaining, the device is placed into a lower power state for the

remainder of the sensing cycle.

Table 5.37 STBY_AVG Bit Decode

STBY_AVG[2:0]

NUMBER OF SAMPLES TAKEN

PER MEASUREMENT

8 (default)

128

Table 5.38 STBY_SAMP_TIME Bit Decode

STBY_SAMP_TIME[1:0]

SAMPLING TIME

320us

640us

1.28ms (default)

2.56ms

Table 5.39 STBY_CY_TIME Bit Decode

STBY_CY_TIME[1:0]

PROGRAMMED SENSING CYCLE

TIME

35ms

70ms (default)

CAP1208 Datasheet(PDF) 52 Page - Microchip Technology