CAP1126 datasheet(36/73 Pages) MICROCHIP

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CAP1126

DS00001623B-page 36

 2015 Microchip Technology Inc.

Bit 5 - BLK_PWR_CTRL - Determines whether the device will reduce power consumption while waiting between con-

version time completion and the end of the polling cycle.

• ‘0’ (default) - The device will always power down as much as possible during the time between the end of the last

conversion and the end of the polling cycle.

• ‘1’ - The device will not power down the Cap Sensor during the time between the end of the last conversion and

the end of the polling cycle.

Bit 4 - BLK_POL_MIR - Determines whether the LED Mirror Control register bits are linked to the LED Polarity bits. Set-

ting this bit blocks the normal behavior which is to automatically set and clear the LED Mirror Control bits when the LED

Polarity bits are set or cleared.

• ‘0’ (default) - When the LED Polarity controls are set, the corresponding LED Mirror control is automatically set.

Likewise, when the LED Polarity controls are cleared, the corresponding LED Mirror control is also cleared.

• ‘1’ - When the LED Polarity controls are set, the corresponding LED Mirror control is not automatically set.

Bit 3 - SHOW_RF_NOISE - Determines whether the Noise Status bits will show RF Noise as the only input source.

• ‘0’ (default) - The Noise Status registers will show both RF noise and low frequency EMI noise if either is detected

on a capacitive touch sensor input.

• ‘1’ - The Noise Status registers will only show RF noise if it is detected on a capacitive touch sensor input. EMI

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

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

Default

22h

R/W

Sensor Input

Configuration

MAX_DUR[3:0]

RPT_RATE[3:0]

A4h

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