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The V_COM voltage of an LCD panel needs to be adjusted to remove flicker. The ISL45042 can be used to digitally adjust a panel's V_COM voltage by controlling its output sink current. The output of the ISL45042 is connected to an external voltage divider and an external V_COM buffer amplifier. In this application, the user can control the V_COM voltage with 7-bit accuracy (128 steps). Once the desired V_COM setting is obtained, the settings can be stored in the non-volatile EEPROM memory, which would then be automatically recalled during every power-up.

The V_COM adjustment and non-volatile memory programming is through a single interface pin (CTL). Once the desired programmed value is obtained, the Counter Enable pin (CE) can be used to prevent further adjustment or programming.

The full-scale sink current of the ISL45042 is set using an external resistor connected to the SET pin. The full-scale sink current determines the lowest voltage of the external voltage divider.

The ISL45042 is available in an 8 Ld 3mmx3mm TDFN package with a maximum thickness of 0.8mm for ultra thin LCD panel design.

Key Features

• 128-Step Adjustable Sink Current Output
• 2.6V to 3.6V Digital Supply Voltage Operating Range (3.0V Minimum Programming Voltage)
• 4.5V to 20V Analog Supply Voltage Operating Range (10.8V Minimum Programming Voltage)
• Rewritable EEPROM for Storing the Optimum VCOM Value
• Output Adjustment Enable/Disable Control
• Output Guaranteed Monotonic Over-Temperature
• Two Pin Adjustment, Programming and Enable
• Ultra Thin 8 Ld 3mmx3mm DFN (0.8mm Max)
• Pb-Free (RoHS Compliant)

Applications

• LCD Panels