LP85571 datasheet(24/49 Pages) TI2

24 / 49 page

LP8557, LP85571

SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015

www.ti.com

8.6 Register Maps

The register map is useful for LP8557I users intending to re-configure the register reset values. If re-

configuration is necessary, it has to be done every time the power on VDD pin is recycled.

There is a restriction on register writes. The COMMAND, BRTLO, and BRTHI registers can be written at any

time; however, the remaining registers only accept writes when the COMMAND.ON bit is low. All registers can be

read at any time.

Many registers contain empty bit locations. These blank areas are reserved for future use. When writing to a

8.6.1 Register Bit Descriptions

8.6.1.1 COMMAND

Address: 0x00h

Reset: 0x00h (LP8557I)

RESET

—

SREN

SSEN

Bits

Field

Type

Default

Description

RESET

R/W

Write 1 to reset the device. This bit is self-clearing and is always 0 when read.

6:3

reserved

R/O

0000b

SREN

R/W

Enable the boost slew rate control.

0 = Slew-rate control off (Default)

1 = Slew-rate control on

SSEN

R/W

Enable the spread-spectrum boost clocking.

0 = Spread-spectrum off (Default)

1 = Spread-spectrum on

R/W

See Description

Turn on the backlight.

0 = backlight off (Default)

1 = backlight on

The COMMAND.ON bit is used to turn on the backlight.

The COMMAND.SSEN and COMMAND.SREN bits may be updated at any time. It is not necessary for the

backlight to be off when changing COMMAND.SSEN or COMMAND.SREN.

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