The MAX1512 is a programmable VCOM-adjustment solution for thin-film transistor (TFT) liquid-crystal displays (LCDs). The MAX1512 simplifies the labor-intensive VCOM-adjustment process and replaces mechanical potentiometers, which significantly reduces labor costs, increases reliability, and enables automation. The MAX1512 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 is 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 IC features a single-wire interface between the LCD panel and the programming circuit. The single-wire interface delivers both programming power and DAC-adjustment commands to minimize changes to panel connectors and production equipment. The MAX1512 is available in an 8-pin 3mm x 3mm TDFN package. A complete evaluation kit is available to sim- plify evaluation and production development. Applications: LCD Panels, Notebook Computers, Monitors, LCD TVs. Features: ♦ 7-Bit Adjustable Sink-Current Output ♦ Resistor-Adjustable Full-Scale Range ♦ Guaranteed Monotonic Output Over Operating Range ♦ Single-Wire Interface
The MAX1512 is a solid-state solution designed to simplify the labor-intensive process of adjusting the backplane voltage (VCOM) in thin-film transistor (TFT) liquid-crystal displays. It functions as an alternative to mechanical potentiometers by attaching to an external resistive voltage divider and sinking a programmable current to set the VCOM level.
The device features an internal 7-bit digital-to-analog converter (DAC) that controls the sink current, which is ratio-metric relative to the analog supply (AVDD). An integrated EEPROM allows manufacturers to store and repeatedly program the desired VCOM voltage settings. The chip communicates via a single-wire interface that delivers both programming power and adjustment commands.
| Sink-Current Output Resolution | 7 Bits |
|---|---|
| Operating Temperature Range | -40°C to +85°C |
| Package Type | 8-Pin 3mm x 3mm TDFN |
| Analog Supply Voltage Range (VAVDD) | 4.5V to 20V |
| Logic Supply Voltage Range (VDD) | 2.6V to 3.6V |
It is a programmable VCOM-adjustment solution specifically designed for thin-film transistor (TFT) liquid-crystal displays.
It attaches to an external resistive voltage divider and sinks a programmable current to set the VCOM voltage level.
Yes, it includes an EEPROM to store the desired VCOM voltage level which can be programmed repeatedly.