CAP1293 datasheet(41/63 Pages) MICROCHIP

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DS00001566B-page 41

CAP1293

Bits 4 - 3 - NEG_DELTA_CNT[1:0] - Determines the number of negative delta counts necessary to trigger a digital reca-

libration (see Section 4.4.2, "Negative Delta Count Recalibration"), as shown in Table 5-33.

Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and number of samples of the automatic recalibration routine

(see Section 4.4.1, "Automatic Recalibration"). The settings apply to all sensor inputs universally (though individual sen-

sor inputs can be configured to support recalibration - see Section 5.10.1).

Note 5-1

Recalibration Samples refers to the number of samples that are measured and averaged before the

Base Count is updated however does not control the base count update period.

Note 5-2

Update Time refers to the amount of time (in sensing cycle periods) that elapses before the Base

Count is updated. The time will depend upon the number of channels enabled, the averaging setting,

and the programmed sensing cycle time.

TABLE 5-33:

NEG_DELTA_CNT BIT DECODE

NEG_DELTA_CNT[1:0]

Number of Consecutive Negative Delta Count Values

16 (default)

None (disabled)

TABLE 5-34:

CAL_CFG BIT DECODE

CAL_CFG[2:0]

Recalibration Samples

(see Note 5-1)

Update Time (see

Note 5-2)

64 (default)

128

256

1024

256

2048

256

4096

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