LP8545 datasheet(30/44 Pages) TI1

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LP8545

SNVS635D – APRIL 2010 – REVISED DECEMBER 2013

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Fault

Address 02h

Reset value 0000 0000b

Fault register

OPEN

SHORT

2_CHANNELS

1_CHANNEL

BL_FAULT

OCP

TSD

UVLO

Name

Bit

Access

Description

OPEN

LED open fault detection

0 = No fault

1 = LED open fault detected. Fault pin is pulled to GND. Fault is cleared by reading

the register 02h or setting EN pin low.

SHORT

LED short fault detection

0 = No fault

1 = LED short fault detected. Fault pin is pulled to GND. Fault is cleared by reading

the register 02h or setting EN pin low.

2_CHANNELS

LED fault detection

0 = No fault

1 = 2 or more channels have generated either short or open fault. Fault pin is pulled

to GND. Fault is cleared by reading the register 02h or setting EN pin low.

1_CHANNEL

LED fault detection

0 = No fault

1 = 1 channel has generated either short or open fault. Fault pin is pulled to GND.

Fault is cleared by reading the register 02h or setting EN pin low.

BL_FAULT

LED fault detection

0 = No fault

1 = LED fault detected. Generated with OR function of all LED faults. Fault pin is

pulled to GND. Fault is cleared by reading the register 02h or setting EN pin low.

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 pin is pulled to GND. Fault is cleared by

reading the register 02h or setting EN pin low. After clearing the fault boost will

startup again.

TSD

Thermal shutdown

0 = No fault

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

be disabled until the temperature has dropped down to 130°C. Fault pin is pulled to

GND. Fault is cleared by reading the register 02h or setting EN pin low.

UVLO

Under voltage detection

0 = No fault

1 = Under voltage detected in VIN pin. Boost converted and LED outputs will be

disabled until VIN voltage is above the threshold voltage. Threshold voltage is set with

EEPROM bits from 3V...9V. Fault pin is pulled to GND. Fault is cleared by reading the

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