LM3914

更新时间： 2024-11-08 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动
页数	文件大小	规格书
19页	368K
描述
Dot/Bar Display Driver

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LM3914 数据手册

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

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.

DS007970

www.national.com

12 3 4 5 6 7...19

中文翻译

下载PDF

与LM3914相关器件

型号	品牌	获取价格	描述	数据表
LM3914_03	NSC	获取价格	Dot/Bar Display Driver
LM3914J	NSC	获取价格	IC IC,LED DISPLAY DRIVER,BARGRAPH,BIPOLAR,DIP,18PIN,CERAMIC, Display Driver
LM3914J/A+	ETC	获取价格	LED Display Driver
LM3914N	NSC	获取价格	Dot/Bar Display Driver
LM3914N/A+	ETC	获取价格	LED Display Driver
LM3914N/B+	ETC	获取价格	LED Display Driver
LM3914N-1	NSC	获取价格	Dot/Bar Display Driver
LM3914N-1	TI	获取价格	LM3914 Dot/Bar Display Driver
LM3914N-1/NOPB	TI	获取价格	LM3914 Dot/Bar Display Driver
LM3914V	TI	获取价格	LM3914 Dot/Bar Display Driver

与LM3914相关文章

英伟达新AI芯片Rubin或提前半年亮相
2024-11-05

22
苹果iPhone 17将全系采用三星/LG显示LTPO OLED面板
2024-11-05

21
三星深化印度制造布局，供应链本地化进程加速
2024-10-29

47
芯擎科技“星辰一号”自动驾驶芯片点亮成功，2025年量产在即
2024-10-29

39

产品中心

服务支持

精选活动

关于我们

帮助中心

LM3914

LM3914 数据手册

与LM3914相关器件

与LM3914相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LM3914

LM3914 数据手册

与LM3914相关器件

与LM3914相关文章

您还可以找

您在本页遇到什么问题？