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LM3914N-1 PDF预览

LM3914N-1

更新时间： 2024-09-15 22:09:03
品牌 Logo 应用领域
美国国家半导体 - NSC 显示驱动器驱动程序和接口接口集成电路光电二极管
页数 文件大小 规格书
19页 368K
描述
Dot/Bar Display Driver

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中文翻译

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LM3914N-1 技术参数

是否Rohs认证：不符合生命周期：Transferred
包装说明：PLASTIC, DIP-18Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.02Is Samacsys：N
其他特性：SELECTABLE DOT MODE数据输入模式：ANALOG
显示模式：BAR GRAPH接口集成电路类型：LED DISPLAY DRIVER
JESD-30 代码：R-PDIP-T18JESD-609代码：e0
长度：21.78 mm湿度敏感等级：1
复用显示功能：NO位数/字符：10-DIGIT
功能数量：1区段数：10
端子数量：18最高工作温度：70 °C
最低工作温度：封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装等效代码：DIP18,.3
封装形状：RECTANGULAR封装形式：IN-LINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：5.08 mm子类别：Display Drivers
最大供电电压：20 V最小供电电压：3 V
标称供电电压：5 V表面贴装：NO
技术：BIPOLAR温度等级：COMMERCIAL
端子面层：Tin/Lead (Sn/Pb)端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：7.62 mm
Base Number Matches：1

LM3914N-1 数据手册

 浏览型号LM3914N-1的Datasheet PDF文件第2页浏览型号LM3914N-1的Datasheet PDF文件第3页浏览型号LM3914N-1的Datasheet PDF文件第4页浏览型号LM3914N-1的Datasheet PDF文件第5页浏览型号LM3914N-1的Datasheet PDF文件第6页浏览型号LM3914N-1的Datasheet PDF文件第7页 
January 2000  
LM3914  
Dot/Bar Display Driver  
Much of the display flexibility derives from the fact that all  
outputs are individual, DC regulated currents. Various effects  
can be achieved by modulating these currents. The indi-  
vidual outputs can drive a transistor as well as a LED at the  
same time, so controller functions including “staging” control  
can be performed. The LM3914 can also act as a program-  
mer, or sequencer.  
General Description  
The LM3914 is a monolithic integrated circuit that senses  
analog voltage levels and drives 10 LEDs, providing a linear  
analog display. A single pin changes the display from a mov-  
ing dot to a bar graph. Current drive to the LEDs is regulated  
and programmable, eliminating the need for resistors. This  
feature is one that allows operation of the whole system from  
less than 3V.  
The LM3914 is rated for operation from 0˚C to +70˚C. The  
LM3914N-1 is available in an 18-lead molded (N) package.  
The circuit contains its own adjustable reference and accu-  
rate 10-step voltage divider. The low-bias-current input  
buffer accepts signals down to ground, or V−, yet needs no  
protection against inputs of 35V above or below ground. The  
buffer drives 10 individual comparators referenced to the  
The following typical application illustrates adjusting of the  
reference to a desired value, and proper grounding for accu-  
rate operation, and avoiding oscillations.  
Features  
n Drives LEDs, LCDs or vacuum fluorescents  
n Bar or dot display mode externally selectable by user  
n Expandable to displays of 100 steps  
n Internal voltage reference from 1.2V to 12V  
n Operates with single supply of less than 3V  
n Inputs operate down to ground  
n Output current programmable from 2 mA to 30 mA  
n No multiplex switching or interaction between outputs  
precision divider. Indication non-linearity can thus be held  
1
%
2 , even over a wide temperature range.  
typically to ⁄  
Versatility was designed into the LM3914 so that controller,  
visual alarm, and expanded scale functions are easily added  
on to the display system. The circuit can drive LEDs of many  
colors, or low-current incandescent lamps. Many LM3914s  
can be “chained” to form displays of 20 to over 100 seg-  
ments. Both ends of the voltage divider are externally avail-  
able so that 2 drivers can be made into a zero-center meter.  
The LM3914 is very easy to apply as an analog meter circuit.  
A 1.2V full-scale meter requires only 1 resistor and a single  
3V to 15V supply in addition to the 10 display LEDs. If the 1  
resistor is a pot, it becomes the LED brightness control. The  
simplified block diagram illustrates this extremely simple ex-  
ternal circuitry.  
±
n Input withstands 35V without damage or false outputs  
n LED driver outputs are current regulated,  
open-collectors  
n Outputs can interface with TTL or CMOS logic  
n The internal 10-step divider is floating and can be  
referenced to a wide range of voltages  
When in the dot mode, there is a small amount of overlap or  
“fade” (about 1 mV) between segments. This assures that at  
no time will all LEDs be “OFF”, and thus any ambiguous dis-  
play is avoided. Various novel displays are possible.  
© 2000 National Semiconductor Corporation  
DS007970  
www.national.com  
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中文翻译

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LM3914N-1 替代型号

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LM3915N-1/NOPB TI

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