CAP1296 datasheet(36/68 Pages) MICROCHIP

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CAP1296

DS00001569B-page 36

 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".

525ms

560ms

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 5-17:

M_PRESS BIT DECODE (CONTINUED)

M_PRESS[3:0]

M_PRESS Settings

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