I²C Gamma and V Buffer with EEPROM

The DS3514 is a programmable gamma and VCOM voltage generator that supports both real-time updating as well as multibyte storage of gamma/VCOM data in on-chip EEPROM memory. An independent 10-bit DAC, two 10-bit data registers, and four words of EEPROM memory are provided for each individually addressable gamma or VCOM channel. High-performance buffer amplifiers are integrated on-chip, providing rail-to-rail, low-power (400µA/gamma channel) operation. The VCOM channel features a high current drive (> 250mA peak) and a fast-settling buffer amplifier optimized to drive the VCOM node of a wide range of TFT-LCD panels.

Programming occurs through an I²C-compatible serial interface. Interface performance and flexibility are enhanced by a pair of independently loaded data latches per channel, as well as support for I²C speeds up to 400kHz. The multitable EEPROM memory enables a rich variety of display system enhancements, including support for temperature or light-level dependent gamma tables, enabling of factory or field automated display adjustment, and support for backlight dimming algorithms to reduce system power. Upon power-up and depending on mode, DAC data is selected from EEPROM by the S0/S1 pins or from a fixed memory address.

Applications

* Adaptive Gamma and VCOM Adjustment (Real Time by I²C, Select EEPROM Through I²C or S0/S1 Pins) * Industrial Process Control * TFT-LCD Gamma and VCOM Buffer

* 10-Bit Gamma Buffers, 14 Channels

* 8-Bit VCOM Buffer, 1 Channel

* Four 10-Bit EEPROM Words per Channel

* Low-Power 400µA/ch Gamma Buffers

* I²C-Compatible Serial Interface

* Flexible Control from I²C or Pins

* 9.0V to 15.0V Analog Supply

* 2.7V to 5.5V Digital Supply

* 48-Pin TQFN Package (7mm x 7mm)