Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8738
Edited by the Electronicstalk Editorial Team on 04 April 2005
Adjuster cuts pots from LCD designs
The MAX8738 is an I2C-programmable VCOM-adjustment solution for thin-film transistor liquid-crystal displays.
New from Maxim Integrated Products, the MAX8738 is an I2C-programmable VCOM-adjustment solution for thin-film transistor (TFT) liquid-crystal displays (LCDs) The MAX8738 simplifies the labour-intensive VCOM-adjustment process and replaces mechanical potentiometers, which significantly reduces labour costs, increases reliability and enables automation
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX8738 calibrator attaches to an external resistive voltage-divider and sinks a programmable current to set the VCOM voltage level.
An internal 7bit digital-to-analogue convertor (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 device 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 two-wire I2C interface for DAC adjustment commands and EEPROM programming.
Because the I2C interface uses the existing I2C bus on the LCD panel connector, no additional panel connector pins are required.
The MAX8738 calibrator is available in an 8-pin microMAX package.
Prices start at $1.75 (1000-up, FOB USA).
To reduce design time, a pre-assembled MAX8738 evaluation kit is available with recommended external components.
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