LP8556 datasheet(34/52 Pages) TI

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LP8556

SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012

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Device Control register

BL_CTL

R/W

Enable backlight when Brightness Register is used to control brightness

( BRT_MODE = 10 ).

0 = Backlight disabled and chip turned off

1 = Backlight enabled and chip turned on

This bit has no effect when PWM pin control is selected for brightness control

( BRT_MODE = 00). In this mode the state of PWM pin enable or disables the chip.

STATUS

Address 02h

Reset value 0000 0000b

Fault register

OPEN

SHORT

VREF_OK

VBOOST_OK

OVP

OCP

TSD

UVLO

Name

Bit

Access

Description

OPEN

LED open fault detection

0 = No fault

1 = LED open fault detected. The value is not latched.

SHORT

LED short fault detection

0 = No fault

1 = LED short fault detected. The value is not latched.

VREF_OK

Internal VREF node monitor status

1 = VREF voltage is OK.

VBOOST_OK

Boost output voltage monitor status

0 = Boost output voltage has not reached its target (VBOOST < Vtarget - 2.5V)

1 = Boost output voltage is OK. The value is not latched.

OVP

Overvoltage protection

0 = No fault

1 = Overvoltage condition occurred. Fault is cleared by reading the register 02h.

OCP

Over current protection

0 = No fault

1 = Over current detected in boost output. OCP detection block monitors the boost

output and if the boost output has been too low for more than 50 ms it will generate

OCP fault and disable the boost. Fault is cleared by reading the register 02h. After

clearing the fault boost will startup again.

TSD

Thermal shutdown

0 = No fault

1 = Thermal fault generated, 150 °C reached. Boost converter and LED outputs will be

disabled until the temperature has dropped down to 130 °C. Fault is cleared by reading

this register.

UVLO

Under voltage detection

0 = No fault

1 = Under voltage detected on the VDD pin. Boost converter and LED outputs will be

disabled until VDD voltage is above the UVLO threshold voltage. Threshold voltage is

set with EPROM bits. Fault is cleared by reading this register.

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