CAP1114 datasheet(70/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

6.33

Configuration 2 Register

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

6.45, "Linked LED Transition Control Registers").

‘0’ (default) - When set, the Linked LED Transition controls set the min duty cycle equal to the max

duty cycle.

‘1’ - When set, the Linked LED Transition controls will invert the touch signal. For example, a touch

signal will be inverted to a non-touched signal.

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 - BLK_RF_NOISE - Blocks the analog RF noise detector from preventing touches.

‘0’ (default) - If RF noise is detected by the analog block, any pending touch is blocked on the

corresponding channel. During the analog calibration routine, RF Noise will cause it to retry. Note

that this does not require that Noise Status bits be set.

‘1’ - A touch is not blocked even if RF noise is detected. Likewise, the analog calibration routine

will not retry 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.

Table 6.50 Configuration 2 Register

ADDR

R/W

DEFAULT

40h

R/W

Configuration

INV_

LINK_

TRAN

BLK_

POL_

MIR

SHOW_

RF_

NOISE

BLK_

RF_

NOISE

VOL_

UP_

DOWN

INT_

REL_n

00h

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