LT3966

29

Rev. 0

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LED Driver Dimming Generator

OFFSET

NAME

DESCRIPTION

b7

b6

b5

b4

b3

b2

b1

b0

0x02

DIMH

PWM Dim Value

SCL2

SCL1

SCL0

DIM4

DIM3

DIM2

DIM1

DIM0

0x03

DIML

PWM Dim Value

DIM12

DIM11

DIM10

DIM9

DIM8

DIM7

DIM6

DIM5

Bit Description

b[7]

SCL[2:0]: PWM Cycle Length Select. Value from 0 to 7 chooses PWM counter length from 6 to 13 bits. This

value is larger than the counter length, the DIM value will be truncated below bit (6+SCL). A DIM value of

0 0000 0000 0001 would be interpreted as 0 in all cases except SCL = 111b.

b[4]

DIM[12:0]: PWM Dimming Setpoint. Specifies the on time of the PWM generator, where period is defined

by SEL. PWM duty cycle is therefore: DIM/n and ranges from 0 to (n-1)/n. To reach 100% on time, simply

disable the dimming generator using the DIMEN bit.

LED Driver Analog Dimming

Offset

Name

Description

b7

b6

b5

b4

b3

b2

b1

b0

0x04

ADIM

Analog Dimming

ADIM7

ADIM6

ADIM5

ADIM4

ADIM3

ADIM2

ADIM1

ADIM0

Bit Description

b[7]

ADIM[7:0]: Modulates the external current sense threshold set by CTRL by the value in the ADIM register.

The default value for ADIM[7:0] is 255.

ANALOG-TO-DIGITAL CONVERTER REGISTERS

ADC Configuration

Default Value: 0000 0000

ADDR

NAME

DESCRIPTION

b7

b6

b5

b4

b3

b2

b1

b0

0x50

ADCCFG

ADC Config

RUN

AUTO

CLKSEL1

CLKSEL0

TGT3

TGT2

TGT1

TGT0

REGISTER TABLE