LP8556 datasheet(39/67 Pages) TI2

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LP8556

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SNVS871M – JULY 2012 – REVISED JUNE 2020

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8.6.2.7 CFG1

Address A1h

CFG1 REGISTER

PDET_STDBY

CURRENT_MAX[2:0]

CURRENT MSB[11:8]

NAME

BIT

ACCESS

DESCRIPTION

PDET_STDBY

R/W

Enable Standby when PWM input is constant low (approx. 50 ms timeout).

CURRENT_MAX

6:4

R/W

Set Maximum LED current as shown below. This maximum current is scaled as

described in the CFG0 Register.

000 = 5 mA

001 = 10 mA

010 = 15 mA

011 = 20 mA

100 = 23 mA

101 = 25 mA

110 = 30 mA

111 = 50 mA

CURRENT MSB

3:0

R/W

These bits form the 4 MSB bits for LED Current as described in CFG0 Register.

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.

LP8556 数据表(PDF) 39 Page - Texas Instruments

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