CAP1214 datasheet(79/107 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 3 - CS4_FDBK - Links the CS4 input to the FEEDBACK pin.

Bit 2 - CS3_FDBK - Links the CS3 input to the FEEDBACK pin.

Bit 1 - CS2_FDBK - Links the CS2 input to the FEEDBACK pin.

Bit 0 - CS1_FDBK - Links the CS1 input to the FEEDBACK pin.

6.41.2

Feedback Channel Configuration 2

For all bits in this register:

‘0’ (default) - The sensor input is not linked to the FEEDBACK pin.

‘1’ - The sensor is linked to the FEEDBACK pin and will assert the pin when a touch is detected.

Bit 6 - CS14_FDBK - Links the CS14 input to the FEEDBACK pin.

Bit 5 - CS13_FDBK - Links the CS13 input to the FEEDBACK pin.

Bit 4 - CS12_FDBK - Links the CS12 input to the FEEDBACK pin.

Bit 3 - CS11_FDBK - Links the CS11 input to the FEEDBACK pin.

Bit 2 - CS10_FDBK - Links the CS10 input to the FEEDBACK pin.

Bit 1 - CS9_FDBK - Links the CS9 input to the FEEDBACK pin.

Bit 0 - CS8_FDBK - Links the CS8 input to the FEEDBACK pin.

6.42

Feedback One-Shot Register

The Feedback One-Shot Register allows the application to notify the CAP1214 to assert the

FEEDBACK pin (see Section 5.7, "FEEDBACK Pin"). This register is self-clearing.

APPLICATION NOTE: If the FDBK_DUR[2:0] settings are set at either ‘000b’ or ‘111b’, this one-shot will not

function.

6.43

LED / GPIO Direction Register

The LED / GPIO Direction Register controls the data flow direction for the LED / GPIO pins. Each pin

is controlled by a single bit.

Table 6.62 Feedback One-Shot Register

ADDR

R/W

DEFAULT

65h

R/W

Feedback

One-Shot

Writing to this register asserts the FEEDBACK pin for the configured duration

at the configured frequency.

00h

Table 6.63 LED / GPIO Direction Register

ADDR

R/W

DEFAULT

70h

R/W

LED / GPIO

Direction

LED8_

DIR

LED7_

DIR

LED6_

DIR

LED5_

DIR

LED4_

DIR

LED3_

DIR

LED2_

DIR

LED1_

DIR

00h

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