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參數資料
| 型號： | LM8342SD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | Programmable TFT VCOM Calibrator with Non-Volatile |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, DSO10 |
| 封裝： | LLP-10 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 951K |
| 代理商： | LM8342SD |
LM8342
Programmable TFT V
COM
Calibrator with Non-Volatile
Memory
General 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
calibration 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.
The V
COM
adjustment can be done electronically in produc-
tion, using the I
2
C 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.
The V
level is typically at half AV
(determined by R1
and R2) and is buffered by the actual V
driver. By
controlling the level of I
, the V
level 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
and an analog reference (AV
). 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
adjustment. Controlling the DAC setting of
the LM8342 is done via its I
2
C 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 I
2
C compatible interface.
Features
n
I
2
C compatible programmable DAC to set the output
current
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
Applications
n
TFT panel factory calibration
n
Digital potentiometer
n
Programmable current sink
Typical Application
20139201
November 2005
L
C
C
2005 National Semiconductor Corporation
DS201392
www.national.com
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| LM8342SDX | Programmable TFT VCOM Calibrator with Non-Volatile |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM8342SD/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM8342SDX | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM8342SDX/NOPB | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| LM8360 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM8361 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:P-MOS LSI LM8361 |
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