Datasheet > LM8342

LM8342

更新时间： 2024-10-01 11:10:39

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描述
具有非易失性存储器的可编程 TFT Vcom 校准器

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LM8342 数据手册

LM8342

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SNOSAM0B –NOVEMBER 2005–REVISED MARCH 2013

LM8342 Programmable TFT V Calibrator with Non-Volatile Memory

COM

Check for Samples: LM8342

FEATURES

DESCRIPTION

The LM8342 is an integrated combination of a non-

volatile register (7 bits EEPROM) and a DAC

controlled current source. Using the LM8342, the

V_COMcalibration procedure is simplified by elimination

of the potentiometer adjustment task. This adjustment

task is currently performed at the factory using a

trimmer adjustment tool and visual inspection.

•

I²C Compatible Programmable DAC to Set the

Output Current

•

Ensured Monotonic DAC

Non-Volatile Memory to Hold the Setting

EEPROM in System Programmable

No External Programming Voltage Required

Maximum Interface Bus Speed is 400 kHz

SON-10 Package

The V_COMadjustment can be done electronically in

production, using the I²C compatible interface. The

factory operator can physically view the screen head-

on (frontal viewing) when performing this step, easing

manufacturing especially for large TFT panels.

APPLICATIONS

•

TFT Panel Factory Calibration

Digital Potentiometer

The V_COMlevel is typically at half AV_DD(determined

by R1 and R2) and is buffered by the actual V_COM

driver. By controlling the level of I_OUT, the V_COMlevel

can be tuned. The current level at the output of the

LM8342 is a fraction (1/128 to 128/128) of a

maximum current which is set by R_SETand an analog

reference (AV_DD). The actual fraction is determined

by the 7-bit DAC. As a result, the output current of

the LM8342 has a good temperature stability yielding

a very stable V_COMadjustment. Controlling the DAC

setting of the LM8342 is done via its I²C compatible

interface. The actual DAC setting is stored in a

volatile register. Using a “Write to EE” command the

data can be stored permanently in the embedded

EEPROM. At power on of the device, the EEPROM

data is copied to the volatile register, setting the DAC.

At any time, the data in the EEPROM can be

changed again via the I²C compatible interface.

Programmable Current Sink

Typical Application

15 kW

COM

OUT

SDA

OUT

SCL

LM8342

SCL-S

SET

CONTROLLER

SET

GND

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...24

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与LM8342相关器件

型号	品牌	获取价格	描述	数据表
LM8342SD	NSC	获取价格	Programmable TFT VCOM Calibrator with Non-Volatile
LM8342SD/NOPB	TI	获取价格	具有非易失性存储器的可编程 TFT Vcom 校准器 \| DSC \| 10 \| -40 t
LM8342SDX	NSC	获取价格	Programmable TFT VCOM Calibrator with Non-Volatile
LM8342SDX/NOPB	TI	获取价格	具有非易失性存储器的可编程 TFT Vcom 校准器 \| DSC \| 10 \| -40 t
LM8360	ETC	获取价格
LM8361	SANYO	获取价格	P-MOS LSI LM8361
LM8361_SERIES	SANYO	获取价格
LM8362	SANYO	获取价格	LM8362
LM8362_SERIES	ETC	获取价格
LM8363	SANYO	获取价格	Dual - Alarm Digital Clock

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