LP8555 datasheet(37/64 Pages) TI1

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LP8555

www.ti.com

SNVS857 – FEBRUARY 2014

8.5.8 BOOST

Address: 0x13

RESERVED

BIND

BFREQ

Bits

Field

Type

Description

7:6

RESERVED

R/W

5:4

RESERVED

R/W

3:2

RESERVED

R/W

BIND bit is used to set boost inductor size.

BIND

R/W

0 = 4.7 µH … 6.8 µH

1 = 10 µH … 22 µH

Boost frequency (typical). This setting must be configured in EPROM, changing it with I2C register write

does not have desired effect.

BFREQ

R/W

0 = 500 kHz

1 = 1 MHz

8.5.9 LEDEN

Address: 0x14

ENABLE[6:1]

Bits

Field

Type

Description

Set LED overvoltage level (typical).

00 = 1V

7:6

R/W

01 = 2V

10 = 3V

11 = 4V

5:0

ENABLE

R/W

LED string enables for Bank A.

The ENABLE field configures the enabled LED strings. If the CONFIG.AUTO bit is 0 these LED strings will stay

active when the backlight is on. If the CONFIG.AUTO bit is set, then an LED open/short condition will cause that

LED string to be removed. A given LED string will never be enabled if the corresponding bit of the ENABLE field

is set to 0. The OV field configures the threshold for detecting an LED overvoltage condition; which may occur

when one or more LEDs are bypassed (shorted) within an LED string.

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