CAP1214 datasheet(64/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

Bit 7 - BUT_LD_TH - Enables setting all button Sensor Threshold registers by writing to the Sensor 1

Threshold register.

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

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

Threshold registers for all buttons (Sensor Threshold 1 through Sensor Threshold 7). The individual

Sensor X Threshold registers (Sensor 2 Threshold through Sensor 7 Threshold) can be individually

updated at any time.

Bit 6 - GP_LD_TH - Enables setting the Group Threshold register by writing to the Sensor 1 Threshold

‘0’ (default) - The Group Threshold register is updated independently of the Sensor 1 Threshold

‘1’ - Writing the Sensor 1 Threshold register automatically overwrites the Group Threshold register

settings.

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 6.38.

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 sensors universally (though individual sensors and the

group can be configured to support re-calibration - see Section 6.19).

Table 6.38 NEG_DELTA_CNT Bit Decode

NEG_DELTA_CNT[1:0]

NUMBER OF CONSECUTIVE NEGATIVE DELTA

COUNT VALUES

32 (default)

None (disabled)

Table 6.39 CAL_CFG Bit Decode

CAL_CFG[2:0]

RECALIBRATION

SAMPLES (SEE

Note 6.1)

UPDATE TIME (SEE

Note 6.2)

256

256 (default)

256

1024

256

2048

256

4096

256

7936

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