CAP1214 datasheet(71/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

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

6.48, "Linked LED Transition Control Registers").

‘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 5 - LED11_CFG - Determines whether LED11 base frequency is configurable.

‘0’ (default) - The PWM base frequency for the LED11 driver is set at ~2000Hz.

‘1’ - The PWM base frequency for the LED11 driver will be configured per settings in the LED11

Configuration Register (8Ah) (see Section 6.56, "LED11 Configuration Register").

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

Polarity bits.

‘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 cleared.

‘1’ - When the LED Polarity controls are changed, the corresponding LED Mirror control is not

automatically changed.

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 channel.

‘1’ - The Noise Status registers will only show RF noise if it is detected on a Capacitive Touch

Sensor channel. Generic 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 - VOL_UP_DOWN - Determines how the Grouped Sensors are to be used.

‘0’ (default) - The grouped sensors are used as a slider. All seven of the sensors are sampled

together and may disabled as a whole using the GP_EN (see Section 6.15) or GSLEEP (see

Section 6.22) controls or individually (using the Grouped Sensor Channel Enable register - see

Section 6.34). Alternately, each sensor may be disabled individually via the Group Sensor Channel

Enable register. They will use the Group Threshold settings for all touch detections.

‘1’ - The grouped sensors are used as separate sensors and are not grouped. They will behave

as follows:

1. Each sensor will flag individual interrupts when a touch is detected. They will set the

corresponding status bit in the Button Status 2 register.

2. The UP / DOWN, TAP, or PH status bits will not be set for CS9, CS10, CS11, CS12, or CS13.

No slide will be detected.

3. Each sensor will use the Group Threshold settings.

4. Each sensor can be individually enabled / disabled via the Grouped Sensor Enable register

settings.

5. All sensors except CS8 and CS14 will use the button queue controls and repeat rates.

6. The CS8 and CS14 sensors will use the tap and press and hold logic as well as the group

repeat rate settings.

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