MAX8738EUA データシートの表示（PDF） - Maxim Integrated

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MAX8738EUA

EEPROM-Programmable TFT VCOM Calibrator with I2C Interface

Maxim Integrated 

19-3624; Rev 0; 3/05

EVAALVUAAILTAIOBNLEKIT

EEPROM-Programmable TFT VCOM

Calibrator with I2C Interface

General Description

The MAX8738 is an I2C-programmable VCOM-adjust-

ment solution for thin-film transistor (TFT) liquid-crystal

displays (LCDs). The MAX8738 simplifies the labor-inten-

sive VCOM-adjustment process and replaces mechani-

cal potentiometers, which significantly reduces labor

costs, increases reliability, and enables automation.

The MAX8738 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 MAX8738 features a 2-wire I2C interface for DAC-

adjustment commands and EEPROM programming.

The interface utilizes the existing I2C bus on the LCD

panel connector so no additional panel connector pins

are required. The MAX1512 is a similar product with a

1-wire interface and is recommended for applications

with no existing I2C interface.

The MAX8738 is available in an 8-pin µMAX® package.

A complete evaluation kit is available to simplify evalua-

tion and production development.

Features

♦ 7-Bit Adjustable Sink-Current Output

♦ Resistor-Adjustable, Full-Scale Range

♦ Guaranteed Monotonic Output Over Operating

Range

♦ 2-Wire I2C Interface

♦ EEPROM Stores VCOM Setting

♦ 4.5V to 20V Analog Supply Voltage Range

(VAVDD)

♦ 60µA (max) AVDD Supply Current

♦ 16.1V to 28V EEPROM Programming Supply

Voltage Range (VHV)

♦ <1µA HV Supply Current (Not in Program Mode)

♦ 8-Pin µMAX

Ordering Information

PART

TEMP RANGE

MAX8738EUA

-40oC to +85oC

MAX8738EUA+

-40oC to +85oC

+Denotes lead-free package.

PIN-PACKAGE

8 µMAX

8 µMAX

LCD Panels

Notebook Computers

Display Products

LCD TVs

Applications

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Pin Configuration

TOP VIEW

OUT 1

AVDD 2

VDD 3

GND 4

MAX8738

8 SET

7 SCL

6 SDA

5 HV

Typical Operating Circuit

+3.3V

VGON

VDD

HV AVDD

AVDD

SDA

I2C

BUS

R1

MAX8738

SCL

OUT

R2

GND

SET

RSET

VCOM

μMAX

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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