CAP1208 datasheet(37/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

 2014 Microchip Technology Inc.

DS00001570B-page 37

5.7

Sensor Input Enable Register

The Sensor Input Enable register determines whether a capacitive touch sensor input is included in

the sensing cycle in the Active state.

For all bits in this register:



‘0’ - The specified input is not included in the sensing cycle in the Active state.



‘1’ (default) - The specified input is included in the sensing cycle in the Active state.

Bit 7 - CS8_EN - Determines whether the CS8 input is monitored in the Active state.

Bit 6 - CS7_EN - Determines whether the CS7 input is monitored in the Active state.

Bit 5 - CS6_EN - Determines whether the CS6 input is monitored in the Active state.

Bit 4 - CS5_EN - Determines whether the CS5 input is monitored in the Active state.

Bit 3 - CS4_EN - Determines whether the CS4 input is monitored in the Active state.

Bit 2 - CS3_EN - Determines whether the CS3 input is monitored in the Active state.

Bit 1 - CS2_EN - Determines whether the CS2 input is monitored in the Active state.

Bit 0 - CS1_EN - Determines whether the CS1 input is monitored in the Active state.

5.8

Sensor Input Configuration Register

The Sensor Input Configuration Register controls timings associated with the capacitive sensor inputs.

Bits 7 - 4 - MAX_DUR[3:0] - (default 1010b) - Determines the maximum time that a sensor pad is

allowed to be touched until the capacitive touch sensor input is recalibrated (see Section 4.4.3,

"Delayed Recalibration"), as shown in Table 5.12.

Table 5.10 Sensor Input Enable Register

ADDR

R/W

B5B4B3B2B1B0

DEFAULT

21h

R/W

Sensor Input

Enable

CS8_EN

CS7_EN

CS6_EN

CS5_EN

CS4_EN

CS3_EN

CS2_EN

CS1_EN

FFh

Table 5.11 Sensor Input Configuration Register

ADDR

R/W

B5B4B3B2B1B0

DEFAULT

22h

R/W

Sensor Input

Configuration

MAX_DUR[3:0]

RPT_RATE[3:0]

A4h

Table 5.12 MAX_DUR Bit Decode

MAX_DUR[3:0]

TIME BEFORE RECALIBRATION

560ms

840ms

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