CAP1203 datasheet(38/59 Pages) MICROCHIP

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DS00001572B-page 38

 2013-2015 Microchip Technology Inc.

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.

Note 5-2

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

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

and the programmed sensing cycle time.

5.18

Sensor Input Threshold Registers

The Sensor Input 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 pad 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 5.17 - bit 7), writing data to the Sensor Input 1 Threshold register will

update all of the Sensor Input Threshold registers (31h - 32h inclusive).

TABLE 5-31:

CAL_CFG BIT DECODE

CAL_CFG[2:0]

Recalibration Samples

(see Note 5-1)

Update Time (see

Note 5-2)

64 (default)

128

256

1024

256

2048

256

4096

TABLE 5-32:

SENSOR INPUT THRESHOLD REGISTERS

Addr

R/W

B5B4

B3B2

B1B0

Default

30h

R/W

Sensor Input 1

Threshold

-64

40h

31h

R/W

Sensor Input 2

Threshold

-64

40h

32h

R/W

Sensor Input 3

Threshold

-64

40h

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