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LM8342SD PDF预览

LM8342SD

更新时间: 2024-09-30 03:51:39
品牌 Logo 应用领域
美国国家半导体 - NSC 消费电路商用集成电路
页数 文件大小 规格书
16页 950K
描述
Programmable TFT VCOM Calibrator with Non-Volatile

LM8342SD 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:LLP-10Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.04Is Samacsys:N
商用集成电路类型:CONSUMER CIRCUITJESD-30 代码:S-XDSO-N10
JESD-609代码:e0长度:3 mm
湿度敏感等级:1功能数量:1
端子数量:10最高工作温度:85 °C
最低工作温度:-40 °C封装主体材料:UNSPECIFIED
封装代码:HVSON封装形状:SQUARE
封装形式:SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度(摄氏度):260
认证状态:Not Qualified座面最大高度:0.8 mm
最大供电电压 (Vsup):3.6 V最小供电电压 (Vsup):2.25 V
表面贴装:YES温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:NO LEAD
端子节距:0.5 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:3 mm
Base Number Matches:1

LM8342SD 数据手册

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November 2005  
LM8342  
Programmable TFT VCOM Calibrator 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  
register (7 bits EEPROM) and a DAC controlled current  
source. Using the LM8342, the VCOM 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.  
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 VCOM adjustment 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 VCOM level is typically at half AVDD (determined by R1  
and R2) and is buffered by the actual VCOM driver. By  
controlling the level of IOUT, the VCOM 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  
RSET and an analog reference (AVDD). 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 VCOM adjustment. 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  
© 2005 National Semiconductor Corporation  
DS201392  
www.national.com  

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