CAP1293 datasheet(35/63 Pages) MICROCHIP

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DS00001566B-page 35

CAP1293

Bits 1 - 0 - CYCLE_TIME[1:0] - Determines the desired sensing cycle time for channels enabled in the Active state, as

shown in Table 5-21. 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 (CYCLE_TIME[1:0]) is only maintained if the actual time

to take the samples is less than the programmed cycle time. The 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.

5.10.1

CALIBRATION ACTIVATE AND STATUS REGISTER

The Calibration Activate and Status Register serves a dual function:

It forces the selected sensor inputs to be calibrated, affecting both the analog and digital blocks (see Section 4.4,

"Sensor Input Calibration"). When one or more bits are set, the device performs the calibration routine on the

corresponding sensor inputs. When the analog calibration routine is finished, the CALX[9:0] bits are updated (see

Section 5.28, "Sensor Input Calibration Registers"). If the analog calibration routine completed successfully for a

sensor input, the corresponding bit is automatically cleared.

APPLICATION NOTE: In the case above, bits can be set by host or are automatically set by the device whenever

a sensor input is newly enabled (such as coming out of Deep Sleep, after power-on reset,

when a bit is set in the Sensor Enable Channel Enable register (21h) and the device is in

the Active state, or when a bit is set in the Standby Channel Enable Register (40h) and the

device is in the Standby state).

It serves as an indicator of an analog calibration failure. If any of the bits could not be cleared, the ACAL_FAIL

bit is set (see Section 5.2, "Status Registers"). A bit will fail to clear if a noise bit is set or if the calibration value

is at the maximum or minimum value.

2.56ms

TABLE 5-21:

CYCLE_TIME BIT DECODE

CYCLE_TIME[1:0]

Programmed Sensing Cycle Time

35ms

70ms (default)

105ms

140ms

TABLE 5-22:

CALIBRATION ACTIVATE AND STATUS REGISTER

Addr

R/W

Default

26h

R/W

Calibration

Activate

and Status

CS3_

CAL

CS2_

CAL

CS1_

CAL

00h

TABLE 5-20:

SAMP_TIME BIT DECODE (CONTINUED)

SAMP_TIME[1:0]

Sample Time

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