CAP1214 datasheet(65/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

Note 6.1

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

before the Base Count is updated.

Note 6.2

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

Base Count is updated.

6.28

Sensor Threshold Registers

The Sensor Threshold Registers store the delta threshold that is used to determine if a touch has been

detected. When a touch occurs, the input signal of the corresponding sensor changes due to the

capacitance associated with a touch. If the sensor input change exceeds the threshold settings, a

touch is detected.

When the BUT_LD_TH bit is set (see Section 6.27 - bit 7), writing data to the Sensor 1 Threshold

When the GP_LD_TH bit is set (see Section 6.27 - bit 6), writing data to the Sensor 1 Threshold

Individual button registers and the Group Threshold register may be updated independently of the

Sensor 1 Threshold settings.

Table 6.40 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

36h

R/W

Sensor 7

Threshold

-64

40h

37h

R/W

Group

Threshold

-64

40h

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