CAP1214 datasheet(84/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

6.47.2

LED Polarity 2

Bit 2 - LED11_POL - Determines the polarity of the LED11 output.

Bit 1 - LED10_POL - Determines the polarity of the LED10 output.

Bit 0 - LED9_POL - Determines the polarity of the LED9 output.

6.48

Linked LED Transition Control Registers

The Linked LED Transition Control Registers control the LED drive when the LED is linked to a

Capacitive Touch sensor. These controls work in conjunction INV_LINK_TRAN bit (see Section 6.33,

"Configuration 2 Register") to create smooth transitions from host control to linked LEDs.

6.48.1

Linked LED Transition Control 1 - 77h

Bit 6 - LED7_LTRAN - Determines the transition effect when LED7 is linked to CS7.

‘0’ (default) - When the LED output control bit for CS7 is ‘1’, and then CS7 is linked to LED7 and

no touch is detected, the LED will change states.

‘1’ - If the INV_LINK_TRAN bit is ‘1’, when the LED output control bit for CS7 is ‘1’, and then CS7

is linked to LED7 and no touch is detected, the LED will not change states. In addition, the LED

state will change when the sensor is touched. If the INV_LINK_TRAN bit is ‘0’, when the LED

output control bit for CS7 is ‘1’, and then CS7 is linked to LED7 and no touch is detected, the LED

will not change states. However, the LED state will not change when the sensor is touched.

APPLICATION NOTE: If the LED behavior is not “Direct” and the INV_LINK_TRAN bit it ‘0’, the LED will not perform

as expected when the LED7_LTRAN bit is set to ‘1’. Therefore, if breathe and pulse

behaviors are used, set the INV_LINK_TRAN bit to ‘1’.

Bit 5 - LED6_LTRAN - Determines the transition effect when LED6 is linked to CS6.

Bit 4 - LED5_LTRAN - Determines the transition effect when LED5 is linked to CS5.

Bit 3 - LED4_LTRAN - Determines the transition effect when LED4 is linked to CS4.

Bit 2 - LED3_LTRAN - Determines the transition effect when LED3 is linked to CS3.

Bit 1 - LED2_LTRAN - Determines the transition effect when LED2 is linked to CS2.

Bit 0 - LED1_LTRAN - Determines the transition effect when LED1 is linked to CS1.

6.48.2

Linked LED Transition Control 2 - 78h

Bit 1 - LED10_LTRAN - Determines the transition effect when LED10 is linked to the Grouped Sensors.

Bit 0 - LED9_LTRAN - Determines the transition effect when LED9 is linked to the Grouped Sensors.

Table 6.69 Linked LED Transition Control Registers

ADDR

R/W

DEFAULT

77h

R/W

Linked LED

Transition Control 1

LED7_

LTRAN

LED6_

LTRAN

LED5_

LTRAN

LED4_

LTRAN

LED3_

LTRAN

LED2_

LTRAN

LED1_

LTRAN

00h

78h

R/W

Linked LED

Transition Control 2

LED10_

LTRAN

LED9_

LTRAN

00h

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