LP8543 datasheet(14/40 Pages) TI

14 / 40 page

Write default values in RAM

Turn the backlight on and check LED

faults (read STATUS register)

Measure display brightness

Calculate new brightness constants

and write to RAM

Erase EEPROM and write RAM

content to EEPROM

Brightness ok

Measure display brightness

YES

LP8543

SNVS604D – AUGUST 2009 – REVISED MARCH 2013

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Energy Efficiency

The voltage across the LED drivers is constantly monitored and boost voltage is adjusted to minimum sufficient

voltage when adaptive boost mode is selected. Inductive boost converter maintains good efficiency over wide

input and output operating voltage ranges. The boost output has over voltage protection limiting the maximum

output to 38V. The boost is internally compensated and the output voltage can be either controlled with 5-bit

LP8543 has an internal 5V LDO with low current consumption. The 5V LDO can supply 5 mA current for external

devices like ALS (Ambient Light Sensor). LDO is switched off in standby mode. The internal LDO is used for

powering internal blocks as well; therefore the 470 nF CVLDO capacitor must be used even if external load is not

used.

Serial Communication

LP8543 supports two serial protocols: SMBus and I2C. IF_SEL input is used to determine the selection. SMBus

interface is selected when IF_SEL is high and I2C is selected when IF_SEL is low.

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