CAP1106 datasheet(25/48 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS00001624B-page 25

CAP1106

noise will still be detected and touches will be blocked normally; however, the status bits will not be updated.

Bit 2 - DIS_RF_NOISE - Determines whether the RF noise filter is enabled. Setting this bit disables the feature.

• ‘0’ (default) - If RF noise is detected by the analog block, the delta count on the corresponding channel is set to 0.

Note that this does not require that Noise Status bits be set.

• ‘1’ - A touch is not blocked even if RF noise is detected.

Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button.

• ‘0’ (default) - An interrupt is generated when a press is detected and again when a release is detected and at the

repeat rate (if enabled - see Section 6.13).

• ‘1’ - An interrupt is generated when a press is detected and at the repeat rate but not when a release is detected.

6.7

Sensor Input Enable Registers

The Sensor Input Enable registers determine whether a capacitive touch sensor input is included in the sampling cycle.

The length of the sampling cycle is not affected by the number of sensor inputs measured.

Bit 5 - CS6_EN - Enables the CS6 input to be included during the sampling cycle.

• ‘0’ - The CS6 input is not included in the sampling cycle.

• ‘1’ (default) - The CS6 input is included in the sampling cycle.

Bit 4 - CS5_EN - Enables the CS5 input to be included during the sampling cycle.

Bit 3 - CS4_EN - Enables the CS4 input to be included during the sampling cycle.

Bit 2 - CS3_EN - Enables the CS3 input to be included during the sampling cycle.

Bit 1 - CS2_EN - Enables the CS2 input to be included during the sampling cycle.

Bit 0 - CS1_EN - Enables the CS1 input to be included during the sampling cycle.

6.8

Sensor Input Configuration Register

The Sensor Input Configuration Register controls timings associated with the Capacitive sensor inputs 1 - 6.

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, as shown in Table 6-13.

TABLE 6-11:

SENSOR INPUT ENABLE REGISTERS

ADDR

R/W

B5B4B3B2B1B0

Default

21h

R/W

Sensor Input

Enable

CS6_EN

CS5_EN

CS4_EN

CS3_EN

CS2_EN

CS1_EN

3Fh

TABLE 6-12:

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 6-13:

MAX_DUR BIT DECODE

MAX_DUR[3:0]

Time Before Recalibration

560ms

840ms

1120ms

1400ms

1680ms

2240ms

2800ms

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