CAP1293 datasheet(46/63 Pages) MICROCHIP

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CAP1293

DS00001566B-page 46

 2013-2015 Microchip Technology Inc.

5.24

Standby Threshold Register

The Standby Threshold register stores 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.

5.25

Sensor Input Base Count Registers

The Sensor Input Base Count registers store the calibrated “not touched” input value from the capacitive touch sensor

inputs. These registers are periodically updated by the calibration and recalibration routines.

The routine uses an internal adder to add the current count value for each reading to the sum of the previous readings

until sample size has been reached. At this point, the upper 16 bits are taken and used as the Sensor Input Base Count.

The internal adder is then reset and the recalibration routine continues.

The data presented is determined by the BASE_SHIFT[3:0] bits (see Section 5.5).

5.26

Power Button Register

The Power Button Register indicates the sensor input that has been designated as the power button (see Section 4.6,

"Power Button").

Bits 2 - 0 - PWR_BTN[2:0] - When the power button feature is enabled, this control indicates the sensor input to be used

as the power button. The decode is shown in Table 5-48.

TABLE 5-45:

STANDBY THRESHOLD REGISTER

Addr

R/W

B5B4

B3B2

B1B0

Default

43h

R/W

Standby

Threshold

-64

40h

TABLE 5-46:

SENSOR INPUT BASE COUNT REGISTERS

Addr

R/W

B5B4

B3B2

B1B0

Default

50h

Sensor Input 1

Base Count

128

C8h

51h

Sensor Input 2

Base Count

128

C8h

52h

Sensor Input 3

Base Count

128

C8h

TABLE 5-47:

POWER BUTTON REGISTER

Addr

R/W

B4B3

B2B1B0

Default

60h

R/W

Power Button

PWR_BTN[2:0]

00h

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