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更新时间:2020-09-04 08:37:41
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LM3914
引腳圖
  • DIP18_300MIL
    封裝:DIP18_300MIL
  • 2012年
    發布時間:2012
  • 參考價格:
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LM3914 引腳圖 | 原理图 | 电路图
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産品概述

Dot/Bar 显示驱动器

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 moving 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 circuit contains its own adjustable reference and accurate 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 precision divider. Indication non-linearity can thus be held typically to ?%, even over a wide temperature range.

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 segments. Both ends of the voltage divider are externally available 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 external circuitry.

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 display is avoided. Various novel displays are possible.

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 individual 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 programmer, or sequencer.

The LM3914 is rated for operation from 0°C to +70°C. The LM3914N-1 is available in an 18-lead PDIP (NFK) package.

The following typical application illustrates adjusting of the reference to a desired value, and proper grounding for accurate operation, and avoiding oscillations.

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Drives LEDs, LCDs or Vacuum Fluorescents
.
Bar or Dot Display Mode Externally Selectable by User
.
Expandable to Displays of 100 Steps
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Internal Voltage Reference from 1.2V to 12V
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Operates with Single Supply of Less than 3V
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Inputs Operate Down to Ground
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Output Current Programmable from 2 mA to 30 mA
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No Multiplex Switching or Interaction Between Outputs
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Input Withstands ±35V without Damage or False Outputs
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LED Driver Outputs are Current Regulated, Open-collectors
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Outputs can Interface with TTL or CMOS Logic
.
The Internal 10-step Divider is Floating and can be Referenced to a Wide Range of Voltages

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LM3914品牌廠家:TI(德州儀器)LM3914渠道分銷商:1家,现货庫存數量:1551 PCS,LM3914价格参考:?5.855元。TI(德州儀器) LM3914参数(,封裝:DIP18_300MIL),LM3914中文資料和說明書PDF下載,您可以在LM3914规格书Datesheet數據手冊中,查到LM3914使用方法,LM3914典型电路教程。LM3914系列中文手册中包含LM3914说明介绍,用户中文手册LM3914手册PDF下载。您可在采芯網下载LM3914产品选型手册,LM3914产品设计参考手册,LM3914用户编程技术手册,LM3914开发手册。

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