CAP1214 datasheet(78/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.0 (08-30-10)

SMSC CAP1214

DATASHEET

Bits 4-0 - FDBK_FREQ[4:0] - Controls the frequency of the FEEDBACK pin output. The LSB

represents 125Hz. For example, a setting of 00100b (04d) represents a frequency of 500Hz (125Hz x

4 = 500Hz). The total range is from 125 Hz to 3875Hz.

A setting of 00000b uses DC, which will set the output full high for the specified duration.

6.41

Feedback Channel Configuration Registers

The Feedback Channel Configuration Registers control which sensors are linked to the FEEDBACK

pin (see Section 5.7, "FEEDBACK Pin").

6.41.1

Feedback Channel Configuration 1

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 - CS7_FDBK - Links the CS7 input to the FEEDBACK pin.

Bit 5 - CS6_FDBK - Links the CS6 input to the FEEDBACK pin.

Bit 4 - CS5_FDBK - Links the CS5 input to the FEEDBACK pin.

Table 6.60 FDBK_DUR Bit Decode

FDBK_DUR[2:0]

DURATION

0 (disabled) (default)

8ms

16ms

32ms

64ms

128ms

256ms

while button is pressed

Table 6.61 Feedback Channel Configuration Registers

ADDR

R/W

DEFAULT

63h

R/W

Feedback

Channel

Configuration 1

CS7_

FDBK

CS6_

FDBK

CS5_

FDBK

CS4_

FDBK

CS3_

FDBK

CS2_

FDBK

CS1_

FDBK

00h

64h

R/W

Feedback

Channel

Configuration 2

CS14_

FDBK

CS13_

FDBK

CS12_

FDBK

CS11_

FDBK

CS10_

FDBK

CS9_

FDBK

CS8_

FDBK

00h

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