CAP1208 datasheet(55/67 Pages) MICROCHIP

55 / 67 page

8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 55

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 4.5, "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 5.45.

5.27

Power Button Configuration Register

Table 5.44 Power Button Register

ADDR

R/W

DEFAULT

60h

R/W

Power Button

PWR_BTN[2:0]

00h

Table 5.45 PWR_BTN Bit Decode

PWR_BTN[2:0]

SENSOR INPUT DESIGNATED AS POWER BUTTON

CS1

CS2

CS3

CS4

CS5

CS6

CS7

CS8

Table 5.46 Power Button Configuration Register

ADDR

R/W

DEFAULT

61h

R/W

Power Button

Configuration

STBY_

PWR_

STBY_PWR_

TIME [1:0]

PWR_

PWR_TIME [1:0]

22h

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