CAP1208 datasheet(40/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

DS00001570B-page 40

 2014 Microchip Technology Inc.

5.10

Averaging and Sampling Configuration Register

The Averaging and Sampling Configuration register controls the number of samples taken and the

target sensing cycle time for sensor inputs enabled in the Active state.

Bits 6 - 4 - AVG[2:0] - Determines the number of samples that are taken for all channels enabled in

the Active state during the sensing cycle as shown in Table 5.17. 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.

For example, if CS1, CS2, and CS3 are sampled during the sensing cycle, and the AVG[2:0] bits are

set to take 4 samples per channel, then the full sensing cycle will be: CS1, CS1, CS1, CS1, CS2, CS2,

CS2, CS2, CS3, CS3, CS3, CS3.

350ms

385ms

420ms

455ms

490ms

525ms

560ms

Table 5.16 Averaging and Sampling Configuration Register

ADDR

R/W

DEFAULT

24h

R/W

Averaging and

Sampling

Config

AVG[2:0]

SAMP_TIME[1:0]

CYCLE_TIME

[1:0]

39h

Table 5.17 AVG Bit Decode

AVG[2:0]

NUMBER OF SAMPLES TAKEN

PER MEASUREMENT

8 (default)

Table 5.15 M_PRESS Bit Decode (continued)

M_PRESS[3:0]

M_PRESS SETTINGS

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