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I²C Gamma and VCOM Buffer with EEPROM

Integrated VCOM Gamma Buffer with Rich Feature Set

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • 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)

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

DS3514: Gamma or VCOM Channel Functional Diagram DS3514: Gamma or VCOM Channel Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .