CAP1208 datasheet(36/67 Pages) MICROCHIP

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8-Channel Capacitive Touch Sensor

Datasheet

DS00001570B-page 36

 2014 Microchip Technology Inc.



‘0’ (default) - The maximum duration recalibration functionality is disabled. A touch may be held

indefinitely and no recalibration will be performed on any sensor input.



‘1’ - The maximum duration recalibration functionality is enabled. If a touch is held for longer than

the MAX_DUR bit settings (see Section 5.8), the recalibration routine will be restarted (see Section

4.4.3, "Delayed Recalibration").

5.6.2

Configuration 2 - 44h

Bit 6 - BC_OUT_RECAL - Controls whether to retry analog calibration when the base count is out of

limit for one or more sensor inputs.



‘0’ - When the BC_OUTx bit is set for a sensor input, the out of limit base count will be used for

the sensor input.



‘1’ (default) - When the BC_OUTx bit is set for a sensor input (see Section 5.17, "Base Count Out

of Limit Register"), analog calibration will be repeated on the sensor input.

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

between conversion time completion and the end of the sensing cycle.



‘0’ (default) - The device will reduce power consumption during the time between the end of the

last conversion and the end of the sensing cycle.



‘1’ - The device will not reduce power consumption during the time between the end of the last

conversion and the end of the sensing cycle.

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 frequency 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 4.8.2, "Capacitive 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 5.13).



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

release is detected.

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