CAP1133 datasheet(26/63 Pages) MICROCHIP

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CAP1133

DS00001625B-page 26

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6.6.2

CONFIGURATION 2 - 44H

Bit 7 - INV_LINK_TRAN - Determines the behavior of the Linked LED Transition controls (see Section 6.29).

• ‘0’ (default) - The Linked LED Transition controls set the min duty cycle equal to the max duty cycle.

• ‘1’ - The Linked LED Transition controls will invert the touch signal. For example, a touch signal will be inverted to

a non-touched signal.

Bit 6 - ALT_POL - Determines the ALERT# pin polarity and behavior.

• ‘0’ - The ALERT# pin is active high and push-pull.

• ‘1’ (default) - The ALERT# pin is active low and open drain.

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

• ‘0’ - The CS3 input is not included in the sampling cycle.

• ‘1’ (default) - The CS3 input is included in 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.

TABLE 6-11:

SENSOR INPUT ENABLE REGISTERS

ADDR

R/W

B5B4B3B2B1B0

Default

21h

R/W

Sensor Input

Enable

CS3_EN

CS2_EN

CS1_EN

07h

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