MAX1512 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – EEPROM-Programmable TFT VCOM Calibrator

19-2911 Rev 2; 8/04
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EEPROM-Programmable TFT VCOM Calibrator
General Description
The MAX1512 is a programmable VCOM-adjustment
solution for thin-film transistor (TFT) liquid-crystal displays
(LCDs). The MAX1512 simplifies the labor-intensive
VCOM-adjustment process and replaces mechanical
potentiometers, which significantly reduces labor costs,
increases reliability, and enables automation.
The MAX1512 attaches to an external resistive voltage-
divider and sinks a programmable current to set the
VCOM voltage level. An internal 7-bit digital-to-analog
converter (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 IC 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 IC features a single-wire interface between the
LCD panel and the programming circuit. The single-
wire interface delivers both programming power and
DAC-adjustment commands to minimize changes to
panel connectors and production equipment. The
MAX1512 is available in an 8-pin 3mm x 3mm TDFN
package. A complete evaluation kit is available to sim-
plify evaluation and production development.
LCD Panels
Notebook Computers
Monitors
LCD TVs
Applications
Pin Configuration
TOP VIEW
OUT 1
AVDD 2
N.C. 3
GND 4
MAX1512
TDFN
8 SET
7 CE
6 CTL
5 V_DD
Features
♦ 7-Bit Adjustable Sink-Current Output
♦ Resistor-Adjustable Full-Scale Range
♦ Guaranteed Monotonic Output Over Operating
Range
♦ Single-Wire Adjustment and Programming*
♦ EEPROM Stores VCOM Setting
♦ Interface Enable/Disable Control (CE)
♦ 2.6V to 3.6V Logic Supply-Voltage Operating
Range (V_DD)
♦ 4.5V to 20V Analog Supply-Voltage Range (V_AVDD)
♦ V_DD UVLO Protection
♦ 8-Pin 3mm x 3mm TDFN (0.8mm max)
Ordering Information
PART
MAX1512ETA
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 8 TDFN 3mm x 3mm
Typical Operating Circuit
V_DD
V_DD
CE
AVDD
MAX1512
OUT
CTL
SET
GND
AVDD
R1
R2
R_SET
VCOM
*Patent Pending.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
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