LP85571 datasheet(26/49 Pages) TI2

26 / 49 page

LP8557, LP85571

SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015

www.ti.com

8.6.1.3 BRTLO

Address: 0x03h

Reset: 0x00h

BRT[3:0]

—

Bits

Field

Type

Default

Description

7:4

BRT[3:0]

R/W

0000b

Least significant bits of the 12-bit wide brightness level. If controlling the brightness

with 8-bit resolution, writing to this register is not needed.

6:0

reserved

R/O

0000b

Reserved.

8.6.1.4 BRTHI

Address: 0x04h

Reset: 0x00h

BRT[11:4]

Bits

Field

Type

Default

Description

7:0

BRT[11:4]

R/W

00h

Most significant bits of the 12-bit wide brightness level. If controlling the brightness

with the 8-bit resolution, writing to this register is all that is needed.

The brightness level can be updated via one (8 bits) or two (16 bits) register writes. The internal brightness level

is 12 bits wide and is only updated when the BRTHI register is written. If the BRTHI register is written without a

previous write to the BRTLO register, then the lower order bits of the internal brightness is synthesized from the

BRTHI register value.

BRTLO

BRTHI

Brightness

Comments

write 0x95

write 0xFC

0xFC9

BRTLO[3:0] is ignored

write 0x10

write 0xDC

0xDC1

set to an exact 12-bit value

no write

write 0x8C

0x8C8

synthesize low order bits

no write

write 0x0C

0x0C0

synthesize low order bits

no write

write 0x00

0x000

0% brightness

no write

write 0xFF

0xFFF

100% brightness

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