CAP1114 datasheet(82/102 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

Revision 1.1 (02-04-11)

SMSC CAP1114

DATASHEET

6.46

LED Mirror Control

The LED Mirror Control Registers determine the meaning of duty cycle settings when polarity is non-

inverted for each LED channel. When the polarity bit is set to ‘1’ (non-inverted), to obtain correct steps

for LED ramping, pulse, and breathe behaviors, the min and max duty cycles need to be relative to

100%, rather than the default, which is relative to 0%.

APPLICATION NOTE: The LED drive assumes that the LEDs are configured such that if the LED pin is driven to

a logic ‘0’, the LED will be on and the CAP1114 LED pin is sinking the LED current. When

the polarity bit is set to ‘1’, it is considered non-inverted. For systems using the opposite LED

configuration, mirror controls would apply when the polarity bit is ‘0’.

These bits are changed automatically if the corresponding LED Polarity bit is changed (unless the

BLK_POL_MIR bit is set - see Section 6.33).

6.46.1

LED Mirror Control 1 - 79h

Bit 7 - LED8_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

‘0’ (default) - The duty cycle settings are determined relative to 0% and are determined directly with

the settings.

‘1’ - The duty cycle settings are determined relative to 100%.

Bit 6 - LED7_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 5 - LED6_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 4 - LED5_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 3 - LED4_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 2 - LED3_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 1 - LED2_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Bit 0 - LED1_MIR_EN - Determines whether the duty cycle settings are “biased” relative to 0% or 100%

duty cycle.

Table 6.66 LED Mirror Control Registers

ADDR

R/W

DEFAULT

79h

R/W

LED Mirror

Control 1

LED8_

MIR _

LED7_

MIR _

LED6_

MIR _

LED5_

MIR _

LED4_

MIR _

LED3_

MIR _

LED2_

MIR _

LED1_

MIR _

00h

7Ah

R/W

LED Mirror

Control 2

LED11_

MIR _

LED10_

MIR _

LED9_

MIR _

00h

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