CAP1296 datasheet(49/68 Pages) MICROCHIP

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DS00001569B-page 49

CAP1296

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.

52h

Sensor Input 3

Base Count

128

C8h

53h

Sensor Input 4

Base Count

128

C8h

54h

Sensor Input 5

Base Count

128

C8h

55h

Sensor Input 6

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

TABLE 5-48:

PWR_BTN BIT DECODE

PWR_BTN[2:0]

Sensor Input Designated as Power Button

CS1

CS2

CS3

CS4

CS5

CS6

TABLE 5-46:

SENSOR INPUT BASE COUNT REGISTERS (CONTINUED)

Addr

R/W

B5B4

B3B2

B1B0

Default

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