LM3914

更新时间： 2024-11-20 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

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中文翻译

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数据手册

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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

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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

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