CAP1126 datasheet(46/73 Pages) MICROCHIP

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CAP1126

DS00001623B-page 46

 2015 Microchip Technology Inc.

a physical touch will 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 active channels during the sensor

cycle as shown in Table 6-37. All samples are taken consecutively on the same channel before the next channel is sam-

pled 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 when the device is in Standby as shown

in Table 6-38.

Bits 1 - 0 - STBY_CY_TIME[2:0] - Determines the overall cycle time for all measured channels during standby operation

as shown in Table 6-39. All measured channels are sampled at the beginning of the cycle time. If additional time is

remaining, the device is placed into a lower power state for the remaining duration of the cycle.

APPLICATION NOTE: The programmed cycle time is only maintained if the total averaging time for all samples is

less than the programmed cycle. The STBY_AVG[2:0] bits will take priority so that if more

samples are required than would normally be allowed during the cycle time, the cycle time

will be extended as necessary to accommodate the number of samples to be measured.

TABLE 6-37:

STBY_AVG BIT DECODE

STBY_AVG[2:0]

Number of Samples Taken per

Measurement

8 (default)

128

TABLE 6-38:

STBY_SAMP_TIME BIT DECODE

STBY_SAMP_TIME[1:0]

Sampling Time

320us

640us

1.28ms (default)

2.56ms

TABLE 6-39:

STBY_CY_TIME BIT DECODE

STBY_CY_TIME[1:0]

Overall Cycle Time

35ms

70ms (default)

105ms

140ms

CAP1126 Datasheet(PDF) 46 Page - Microchip Technology