Status
Active: In Production.
Description
The MAX8738 is an I²C-programmable VCOM-adjustment solution for thin-film transistor (TFT) liquid-crystal displays (LCDs). The MAX8738 simplifies the labor-intensive VCOM-adjustment process and replaces mechanical potentiometers, which significantly reduces labor costs, increases reliability, and enables automation. The MAX8738 attaches to an external resistive voltage-divider and sinks a programmable current to set the VCOM voltage level. An internal 7-bit digital-to-analog converter (DAC) controls the sink current. The DAC ratiometric relative to AVDD and is guaranteed to be monotonic over all operating conditions. This VCOM calibrator IC includes an EEPROM to store the desired VCOM voltage level. The EEPROM can be programmed repeatedly, giving TFT LCD manufacturers the flexibility to calibrate the display panel as many times as the manufacturing process requires.
The MAX8738 features a 2-wire I²C interface for DAC-adjustment commands and EEPROM programming. The interface utilizes the existing I²C bus on the LCD panel connector so no additional panel connector pins are required. The MAX1512 is a similar product with 1-wire interface and is recommended for applications with no existing I²C interface.
The MAX8738 is available in an 8-pin µMAX® package. A complete evaluation kit is available to simplify evaluation and production development.
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