LP8556 datasheet(34/63 Pages) TI1

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LP8556

SNVS871I – JULY 2012 – REVISED MARCH 2016

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8.6.1.3 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 = Overcurrent condition occurred. Fault bit is cleared by reading this register.

TSD

Thermal shutdown

0 = No fault

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

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

this register.

UVLO

Undervoltage detection

0 = No fault

1 = Undervoltage detected on the VDD pin. Boost converter and LED outputs are

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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