CAP1208 datasheet(48/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

DS00001570B-page 48

 2014 Microchip Technology Inc.

5.18

Recalibration Configuration Register

The Recalibration Configuration register controls some recalibration routine settings (see Section 4.4,

"Sensor Input Calibration") as well as advanced controls to program the Sensor Input Threshold

Bit 7 - BUT_LD_TH - Enables setting all Sensor Input Threshold registers by writing to the Sensor

Input 1 Threshold register.



‘0’ - Each Sensor Input X Threshold register is updated individually.



‘1’ (default) - Writing the Sensor Input 1 Threshold register will automatically overwrite the Sensor

Input Threshold registers for all sensor inputs (Sensor Input Threshold 1 through Sensor Input

Threshold 8). The individual Sensor 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 recalibration (see Section 4.4.2, "Negative Delta Count Recalibration"), as shown in

Table 5.30.

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

Table 5.29 Recalibration Configuration Registers

ADDR

R/W

DEFAULT

2Fh

R/W

Recalibration

Configuration

BUT_

LD_TH

NO_CLR

_INTD

NO_CLR

_NEG

NEG_DELTA_

CNT[1:0]

CAL_CFG[2:0]

8Ah

Table 5.30 NEG_DELTA_CNT Bit Decode

NEG_DELTA_CNT[1:0]

NUMBER OF CONSECUTIVE NEGATIVE DELTA

COUNT VALUES

16 (default)

None (disabled)

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