CAP1128 datasheet(45/75 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001622B-page 45

CAP1128

Input X Threshold registers (Sensor Input 2 Threshold through Sensor Input 8 Threshold) can be individually

updated at any time.

Bit 6 - NO_CLR_INTD - Controls whether the accumulation of intermediate data is cleared if the noise status bit is set.

• ‘0’ (default) - The accumulation of intermediate data is cleared if the noise status bit is set.

• ‘1’ - The accumulation of intermediate data is not cleared if the noise status bit is set.

APPLICATION NOTE: Bits 5 and 6 should both be set to the same value. Either both should be set to ‘0’ or both

should be set to ‘1’.

Bit 5 - NO_CLR_NEG - Controls whether the consecutive negative delta counts counter is cleared if the noise status bit

is set.

• ‘0’ (default) - The consecutive negative delta counts counter is cleared if the noise status bit is set.

• ‘1’ - The consecutive negative delta counts counter is not cleared if the noise status bit is set.

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

calibration as shown in Table 6-30.

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

The settings apply to all sensor inputs universally (though individual sensor inputs can be configured to support re-cal-

ibration - see Section 6.11).

Note 6-1

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 6-2

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

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

and the programmed cycle time.

TABLE 6-30:

NEG_DELTA_CNT BIT DECODE

NEG_DELTA_CNT[1:0]

Number of Consecutive Negative Delta Count Values

16 (default)

None (disabled)

TABLE 6-31:

CAL_CFG BIT DECODE

CAL_CFG[2:0]

Recalibration Samples

(see Note 6-1)

Update Time (see

Note 6-2)

64 (default)

128

256

1024

256

2048

256

4096

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