CAP1293 datasheet(34/63 Pages) MICROCHIP

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CAP1293

DS00001566B-page 34

 2013-2015 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 5-19. 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 mea-

sured 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 sam-

ples per channel, then the full sensing cycle will be: CS1, CS1, CS1, CS1, CS2, CS2, CS2, CS2, CS3, CS3, CS3, CS3.

Bits 3 - 2 - SAMP_TIME[1:0] - Determines the time to take a single sample as shown in Table 5-20. Sample time affects

the magnitude of the base counts, as shown in Table 4-1, "Ideal Base Counts".

TABLE 5-18:

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 5-19:

AVG BIT DECODE

AVG[2:0]

Number Of Samples Taken Per

Measurement

8 (default)

128

TABLE 5-20:

SAMP_TIME BIT DECODE

SAMP_TIME[1:0]

Sample Time

320us

640us

1.28ms (default)

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