DS3514 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – I2C Gamma and VCOM Buffer with EEPROM

Rev 1; 10/08
I²C Gamma and V_COM Buffer with EEPROM
General Description
The DS3514 is a programmable gamma and V_COM volt-
age generator that supports both real-time updating as
well as multibyte storage of gamma/V_COM data in on-
chip EEPROM memory. An independent 10-bit DAC, two
10-bit data registers, and four words of EEPROM memo-
ry are provided for each individually addressable
gamma or V_COM channel. High-performance buffer
amplifiers are integrated on-chip, providing rail-to-rail,
low-power (400µA/gamma channel) operation. The
V_COM channel features a high current drive (> 250mA
peak) and a fast-settling buffer amplifier optimized to
drive the V_COM 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 latch-
es 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
TFT-LCD Gamma and V_COM Buffer
Adaptive Gamma and V_COM Adjustment (Real
Time by I²C, Select EEPROM Through I²C or
S0/S1 Pins)
Industrial Process Control
Features
♦ 10-Bit Gamma Buffers, 14 Channels
♦ 8-Bit V_COM 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)
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS3514T+
DS3514T+T&R
-45°C to +95°C
-45°C to +95°C
48 TQFN-EP*
48 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
Gamma or V_COM Channel Functional Diagram
SDA, SCL
A0
I²C
INTERFACE
LATCH A
8-/
MUX
LATCH B
10-BIT*
DAC
V_OUT
S1/ S0
LOGIC
IN
OUT
EEPROM
ADDRESS
LD
* 10 BITS FOR GAMMA CHANNELS, 8 BITS FOR THE V_COM CHANNEL.
________________________________________________________________ Maxim Integrated Products 1
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or visit Maxim’s website at www.maxim-ic.com.