LP85571 datasheet(27/49 Pages) TI2

27 / 49 page

LP8557, LP85571

www.ti.com

SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015

8.6.1.5 CONFIG

Address: 0x10h

Reset: 0x07h (LP8557I)

PWMSB

—

AUTO

BRTMODE[1:0]

Bits

Field

Type

Default

Description

PWMSB

R/W

Enables PWM standby mode

0 = COMMAND.ON alone turns the backlight on/off (Default)

1 = turn off the backlight after 52 ms of PWM pin low

6:3

reserved

R/O

0000b

AUTO

R/W

Automatic LED string configuration0 = enable LED strings using just

LEDEN.ENABLE

1 = disable all open LED strings (Default)

1:0

BRTMODE

R/W

11b

Brightness mode

00 = PWM

01 = BRTHI/BRTLO registers

10 = PWM × unshaped BRTHI/BRTLO registers

11 = Unshaped PWM × BRTHI/BRTLO registers

The AUTO bit is set, and the LED string configuration is done automatically. The LP8557I allows users to disable

the auto-detect function by setting AUTO bit to 0b.

8.6.1.6 CURRENT

Address: 0x11h

Reset: 0x07h (LP8557I)

ISET

——

MAXCURR[2:0]

Bits

Field

Type

Default

Description

ISET

R/W

Set full-scale LED current via the ISET pin.

0 = Full-scale current is set with MAXCURR bits. (Default)

1 = Full-scale current is set with an external, RISET, resistor.

6:3

reserved

R/O

0000b

2:0

MAXCURR

R/W

111b

Full-scale current (100% brightness).

000 = 5 mA

001 = 10 mA

010 = 13 mA

011 = 15 mA

100 = 18 mA

101 = 20 mA

110 = 23 mA

111 = 25 mA (Default)

The ISET bit determines how the maximum LED current is set. On the LP8557I (ISET = 0), the maximum LED

current is 25 mA. It may be re-configured via the I2C interface by overriding MAXCURR bits. Note that re-

configuration must be done every time the power on VDD pin is recycled.

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