CAP1066 datasheet(55/71 Pages) SMSC

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6 Channel Capacitive Touch Sensor with 6 LED Drivers

Datasheet

SMSC CAP1066

Revision 1.1 (08-05-09)

DATASHEET

5.26

LED Output Control Register

The LED Output Control Register controls the output state of the LED pins.

All LEDs that are associated with a Capacitive Touch Sensor channel are automatically enabled and

will be actuated per the LED Behavior.

For those LEDs that are not linked with a Capacitive Touch Sensor channel, then the bit state

determines whether the LED is actuated or not actuated.

The LED Polarity Control register will determine the non actuated state of the LED pins.

Table 5.41 shows the interaction between the polarity controls, output controls and relative brightness.

Note 5.3

For example: when polarity is non-inverted, if min duty cycle is 0, then the LED would be

at logic 1 (off) 0% of the time. It will be at logic 0 (on), 100% of the time (100 - min duty

cycle).

Bit 5 - LED6_DR - Determines whether LED6 output is driven high or low.

‘0’ (default) - The LED6 output is driven at the minimum duty cycle or not actuated.

‘1’ - The LED6 output is driven at the maximum duty cycle or is actuated.

Bit 4 - LED5_DR - Determines whether LED5 output is driven high or low.

Bit 3 - LED4_DR - Determines whether LED4 output is driven high or low.

Bit 2 - LED3_DR - Determines whether LED3 output is driven high or low.

Bit 1 - LED2_DR - Determines whether LED2 output is driven high or low.

Bit 0 - LED1_DR - Determines whether LED1 output is driven high or low.

Table 5.40 LED Output Control Register

ADDR

R/W

DEFAULT

74h

R/W

LED Output

Control

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

00h

Table 5.41 LED Polarity Behavior

LED

OUTPUT

CONTROL

POLARITY

MAX DUTY

MIN DUTY

LED

BEHAVIORS

BRIGHTNESS

LED

APPEARANCE

inverted

maximum % of

time that the LED

is on (logic 0)

minimum % of

time that the LED

is on (logic 0)

off

maximum brightness at

minimum duty cycle

on at minimum

duty cycle

inverted

maximum % of

time that the LED

is on (logic 0)

minimum % of

time that the LED

is on (logic 0)

maximum brightness at

max duty cycle. Brightness

ramps from min to max

according to

LED behavior

non-

inverted

maximum % of

time that the LED

is off (logic 1)

minimum % of

time that the LED

is off (logic 1)

off

maximum brightness at 100

- min duty cycle

on at 100 - min

duty cycle

(Note 5.3)

non-

inverted

maximum % of

time that the LED

is off (logic 1)

minimum % of

time that the LED

is off (logic 1)

maximum brightness at 100

- min duty cycle. Brightness

ramps from max to min

according to

LED behavior

CAP1066 Datasheet(PDF) 55 Page - SMSC Corporation

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