CAP1298 datasheet(33/68 Pages) MICROCHIP

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CAP1298

Bit 4 - BC_OUT_INT - Controls the interrupt behavior when the base count is out of limit for one or more sensor inputs.

• ‘0’ (default) - An interrupt is not generated when the BC_OUT bit is set (see Section 5.2, "Status Registers").

• ‘1’ - An interrupt is generated when the BC_OUT bit is 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 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. Low fre-

quency 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 1 - ACAL_FAIL_INT - Controls the interrupt behavior when analog calibration fails for one or more sensor inputs (see

Section 4.4, "Sensor Input Calibration").

• ‘0’ (default) - An interrupt is not generated when the ACAL_FAIL bit is set (see Section 5.2, "Status Registers").

• ‘1’ - An interrupt is generated when the ACAL_FAIL bit is set

Bit 0 - INT_REL_n - Controls the interrupt behavior when a release is detected on a button (see Section 4.9.2, "Capac-

itive Sensor Input Interrupt Behavior").

• ‘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 5.12).

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

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.

TABLE 5-12:

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

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