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Programmable Vcom calibrator includes I2C interface

Posted: 29 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Intersil? Vcom calibrator? ISL45041?

Intersil Corp. introduced a 7-bit non-volatile programmable Vcom calibrator with I2C interface for setting backplane common voltage in TFT-LCDs of TVs, notebook computers and monitors.

The new ISL45041 is designed to reduce the flicker of an LCD panel by adjusting the Vcom voltage during production, replacing the mechanical potentiometers normally needed to adjust Vcom. This device incorporates an I2C interface and a 128-step adjustable sink current output current control. Its digital interface controls the sink-current output that attaches to an external voltage driver to establish the required Vcom voltage setting.

"Adjusting the Vcom of TFT-LCD panels is a labor-intensive process that can be simplified by using our new non-volatile Vcom calibrator," said Oleg Steciw, marketing manager for Intersil's display products group. "This solution allows the user to replace one of the last mechanical stages in TFT-LCD panel assembly, reducing labor time and costs while significantly increasing reliability."

The ISL45041 also features an on-board 7-bit EEPROM bank, an analog voltage range of 4.5V to 18V, a digital voltage range from 2.25V to 3.6V, an output adjustment SET pin, and an output-guaranteed monotonic over temperature.

According to Intersil, its new product lets customers easily set and drive the desired Vcom voltage on the TFT-LCD panel via the I2C interface and with a resolution of 7 bits. Once the ideal value is found, explained the company, it can be programmed and stored in the on-board non-volatile EEPROM memory bank. Then, after it is set, the Vcom voltage can be driven throughout the common backplane via a high-performance rail-to-rail input and output, high-output-current Vcom driver.

The ISL45041 is housed in a DFN-8 Pb-free package that measures 3-by-3mm, with a maximum thickness of 0.8mm. It is priced at $1.40 each in 1,000-unit quantities.

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