I2C LCD Module Calibrator

The ISL45045 is specifically designed to work in notebook

applications where the system’s EEPROM is powered up

before the rest of the devices on the I2C bus. This enables

data to be downloaded to a graphics card. The ESD

protection scheme on the SDA, SCL and SCL_S pins

prevent the loading of the I2C bus during the initialization

period prior to full power-up of the notebook.

The VCOM voltage of an LCD panel needs to be adjusted to

remove flicker. This part provides a digital interface to control

the sink-current output that attaches to an external voltage

divider. The increase in output sink current lowers the

voltage on the external divider, which is applied to an

external VCOM buffer amplifier. The desired VCOM setting

is loaded from an external source via a standard two-wire

I2C serial interface. At power-up, the part automatically

comes up at the last programmed setting in an on-board

7-bit EEPROM.

An external resistor attaches to the SET pin and sets the

full-scale sink current that determines the lowest voltage of

the external voltage divider.

The ISL45045 is available in an 10 Ld 3mmx3mm TDFN

package with a maximum thickness of 0.8mm for ultra thin

LCD panel design.

Features

? 128-Step Adjustable Sink Current Output

? 2.25V to 3.6V Logic Supply Voltage Operating Range

(2.6V Minimum Programming Voltage)

? Analog Supply Voltage Range 4.5V to 18V for VDD from

2.6V to 3.6V; 4.5V to 13V for VDD from 2.25V to 3.6V

? SDA, SCL, SCL_S pins tolerant to system power-up

sequences (i.e will not alter I2C bus state)

? I2C Interface (Slave and Transmitter) -- Address: 1001111

? On-board 7-bit EEPROM

? Output adjustment SET Pin

? Output Guaranteed Monotonic Over-Temperature

? Thin 10 Ld 3mmx3mm DFN (0.8mm max)

? Pb-Free (RoHS Compliant)

Applications

? LCD Panels