CAP1006 datasheet(41/53 Pages) SMSC

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5 and 6 Channel Capacitive Touch Sensor

Datasheet

SMSC CAP1005 / CAP1006

Revision 1.1 (08-05-09)

DATASHEET

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

calibration routine. The settings applies to all sensors universally (though individual sensors can be

configured to support re-calibration - see Section 5.11).

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.

Once this target number of update cycles is reached, the device may wait additional time

as determined by the Update Time before the base count is updated as determiend by the

settings.

Note 5.2

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

Base Count is updated. For those settings that have the Update Time greater than the

Recalibration Samples value, the device will wait (and continue to average the updated

base count) until the Update Time has elapsed before the base count is updated.

5.16

Sensor Threshold Registers

Table 5.25 CAL_CFG Bit Decode

CAL_CFG[2:0]

RECALIBRATION

SAMPLES (SEE

Note 5.1)

UPDATE TIME (SEE

Note 5.2)

256

256 (default)

256

1024

256

2048

256

4096

256

7936

Table 5.26 Sensor Threshold Registers

ADDR

R/W

DEFAULT

30h

R/W

Sensor 1

Threshold

-64

40h

31h

R/W

Sensor 2

Threshold

-64

40h

32h

R/W

Sensor 3

Threshold

-64

40h

33h

R/W

Sensor 4

Threshold

-64

40h

34h

R/W

Sensor 5

Threshold

-64

40h

35h

R/W

Sensor 6

Threshold

-64

40h

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