LP85571 datasheet(25/49 Pages) TI2

25 / 49 page

LP8557, LP85571

www.ti.com

SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015

8.6.1.2 STATUS

Address: 0x01h

Reset: 0x00h

LED_OPEN*

LED_SHORT

–

BST_UV

BST_OVP

BST_OCP

TSD

UVLO

Bits

Field

Type

Default

Description

LED_OPEN*

R/O

An LED_OPEN* condition was detected on one or more strings. The condition is set

when the headroom voltage on one or more current sinks is below the LOW

comparator threshold, and the boost voltage is at the maximum. This fault condition

may be caused by one or more OPEN LED strings or by one or more current sinks

shorted to GND. Once set this bit stays set until the STATUS register is read. An

LED_OPEN* condition turns off the backlight when CONFIG.AUTO is 0. When

CONFIG.AUTO is 1, the condition is never set.

LED_SHORT

R/O

An LED SHORT condition was detected on one or more strings. The condition is set

when the headroom voltage on one or more current sinks is above the FAULT

comparator threshold and at least one driver has the headroom voltage in regulation

(between LOW and MID comparator thresholds). This fault condition may be caused

by one or more shorted LEDs on one or more (but not all) strings. Once set this bit

stays set until the STATUS register is read.

reserved

R/O

BST_UV

R/O

A boost output undervoltage condition was detected. The boost voltage is 2.5 V

(typical) or more below the target. Once set this bit stays set until the STATUS

BST_OVP

R/O

A boost overvoltage protection condition was detected. The boost voltage is 1.6 V

(typical) above the VMAX value. Once set this bit stays set until the STATUS register

is read.

BST_OCP

R/O

A boost overcurrent protection condition was detected. Once set this bit stays set

until the STATUS register is read.

TSD

R/O

A thermal shutdown condition was detected. Once set, this bit stays set until the

STATUS register is read. A thermal shutdown condition turns off the backlight.

UVLO

R/O

An input undervoltage lockout condition was detected. Once set, this bit stays set

until the STATUS register is read. An undervoltage lockout condition turns off the

backlight.

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