CAP1133 datasheet(40/63 Pages) MICROCHIP

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CAP1133

DS00001625B-page 40

 2015 Microchip Technology Inc.

The LED Polarity Control Register will determine the non actuated state of the LED pins. The actuated LED behavior is

determined by the LED behavior controls (see Section 6.31, "LED Behavior Register").

Table 6-48 shows the interaction between the polarity controls, output controls, and relative brightness.

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

• ‘0’ (default) - The LED3 output is driven at the minimum duty cycle or not actuated.

• ‘1’ - The LED3 output is driven at the maximum duty cycle or is actuated.

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.

6.29

Linked LED Transition Control Register

The Linked LED Transition Control register controls the LED drive when the LED is linked to a capacitive touch sensor

input. These controls work in conjunction with the INV_LINK_TRAN bit (see Section 6.6.2, "Configuration 2 - 44h") to

create smooth transitions from host control to linked LEDs.

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

• ‘0’ (default) - When the LED output control bit for LED3 is ‘1’, and then LED3 is linked to CS3 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 CS3 is ‘1’, and then CS3 is linked to LED3

and no touch is detected, the LED will not change states. In addition, the LED state will change when the sensor

pad is touched. If the INV_LINK_TRAN bit is ‘0’, when the LED output control bit for CS3 is ‘1’, and then CS3 is

linked to LED3 and no touch is detected, the LED will not change states. However, the LED state will not change

TABLE 6-48:

LED POLARITY BEHAVIOR

LED Output

Control

Touch

Polarity

Max Duty

Min Duty

Brightness

LED Appearance

inverted (‘0’)

not used

minimum % of time

that the LED is on

(logic 0)

maximum brightness at

min duty cycle

on at min duty

cycle

inverted (‘0’)

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. Bright-

ness ramps from min

duty cycle to max duty

cycle

according to LED

behavior

non-inverted

(‘1’)

not used

minimum % of time

that the LED is off

(logic 1)

maximum brightness at

100 minus min duty

cycle.

on at 100 - min

duty cycle

non-inverted

(‘1’)

maximum % of time

that the LED is off

(logic 1)

minimum % of time

that the LED is off

(logic 1)

For Direct behavior,

maximum brightness is

100 minus max duty

cycle. When breath-

ing, max brightness is

100 minus min duty

cycle. Brightness

ramps from 100 - min

duty cycle to 100 - max

duty cycle.

according to LED

behavior

TABLE 6-49:

LINKED LED TRANSITION CONTROL REGISTER

ADDR

R/W

Default

77h

R/W

Linked LED Tran-

sition Control

LED3_

LTRAN

LED2_

LTRAN

LED1_

LTRAN

00h

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