LP8556 datasheet(39/63 Pages) TI1

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LP8556

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SNVS871I – JULY 2012 – REVISED MARCH 2016

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8.6.2.8 CFG2

Address A2h

CFG2 REGISTER

RESERVED

UVLO_EN

UVLO_TH

BL_ON

ISET_EN

BOOST_

_FSET_EN

PWM_

_FSET_EN

NAME

BIT

ACCESS

DESCRIPTION

RESERVED

7:6

R/W

UVLO_EN

R/W

Undervoltage lockout protection enable.

UVLO_TH

R/W

UVLO threshold levels:

0 = 2.5 V

1 = 5.2 V

BL_ON

R/W

Enable backlight. This bit must be set for PWM only control.

0 = Backlight disabled. This selection is recommended for systems with an I2C

master. With an I2C master, the backlight can be controlled by writing to the

1 = Backlight enabled. This selection is recommended for systems with PWM

only control.

ISET_EN

R/W

Enable LED current set resistor.

0 = Resistor is disabled and current is set with CURRENT and CURRENT_MAX

EPROM register bits.

1 = Resistor is enabled and current is set with the RISET resistor AND

CURRENT AND CURRENT_MAX EPROM register bits.

BOOST_FSET_EN

R/W

Enable configuration of the switching frequency via FSET pin.

0 = Configuration of the switching frequency via FSET pin is is disabled. The

switching frequency is set with BOOST_FREQ EPROM register bits.

1 = Configuration of the switching frequency via FSET pin is is enabled.

PWM_FSET_EN

R/W

Enable configuration of the PWM dimming frequency via FSET pin.

0 = Configuration of the switching frequency via FSET pin is is disabled. The

switching frequency is set with PWM_FREQ EPROM register bits.

1 = Configuration of the PWM dimming frequency via FSET pin is is enabled.

8.6.2.9 CFG3

Address A3h

CFG3 REGISTER

RESERVED

SLOPE[2:0]

FILTER[1:0]

PWM_INPUT_HYSTERESIS[1:0]

NAME

BIT

ACCESS

DESCRIPTION

RESERVED

R/W

SLOPE

6:4

R/W

Select brightness change transition duration

000 = 0 ms (immediate change)

001 = 1 ms

010 = 2 ms

011 = 50 ms

100 = 100 ms

101 = 200 ms

110 = 300 ms

111 = 500 ms

FILTER

3:2

R/W

Select brightness change transition filtering strength

00 = No filtering

01 = light smoothing

10 = medium smoothing

11 = heavy smoothing

PWM_INPUT_

_HYSTERESIS

1:0

R/W

PWM input hysteresis function.

00 = OFF

01 = 1-bit hysteresis with 13-bit resolution

10 = 1-bit hysteresis with 12-bit resolution

11 = 1-bit hysteresis with 8-bit resolution

LP8556 Datasheet(PDF) 39 Page - Texas Instruments

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