LM8342

更新时间： 2024-11-18 03:51:39

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
16页	950K
描述
Programmable TFT VCOM Calibrator with Non-Volatile

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LM8342 数据手册

November 2005

LM8342

Programmable TFT V_COMCalibrator with Non-Volatile

Memory

General Description

Features

n I²C compatible programmable DAC to set the output

current

The LM8342 is an integrated combination of a non-volatile

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 inspec-

tion.

n Guaranteed monotonic DAC

n Non-volatile memory to hold the setting

n EEPROM in system programmable

n No external programming voltage required

n Maximum interface bus speed is 400 kHz

n LLP-10 Package

The V_COMadjustment can be done electronically in produc-

tion, 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

n TFT panel factory calibration

n Digital potentiometer

The V_COMlevel is typically at half AV_DD(determined by R1

and R2) and is buffered by the actual V_COMdriver. 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.

n Programmable current sink

Typical Application

20139201

DS201392

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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
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