CAP1203 datasheet(41/59 Pages) MICROCHIP

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DS00001572B-page 41

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.

APPLICATION NOTE: The programmed sensing cycle time (STDBY_CY_TIME[1:0] is only maintained if the actual

time to take the samples is less than the programmed cycle time. The STBY_AVG[2:0] bits

will take priority, so the sensing cycle time will be extended as necessary to accommodate

the number of samples to be measured.

5.22

Standby Sensitivity Register

The Standby Sensitivity register controls the sensitivity for sensor inputs enabled in Standby.

Bits 2 - 0 - STBY_SENSE[2:0] - Controls the sensitivity for sensor inputs that are enabled in Standby. The sensitivity

settings act to scale the relative delta count value higher or lower based on the system parameters. A setting of 000b is

the most sensitive while a setting of 111b is the least sensitive. At the more sensitive settings, touches are detected for

a smaller delta capacitance corresponding to a “lighter” touch. These settings are more sensitive to noise, however, and

a noisy environment may flag more false touches than higher sensitivity levels.

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)

105ms

140ms

TABLE 5-40:

STANDBY SENSITIVITY REGISTER

Addr

R/W

B5B4

B3B2

B1B0

Default

42h

R/W

Standby

Sensitivity

STBY_SENSE[2:0]

02h

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