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LM3914 analog voltage level DOT/BAR Display driver IC

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 moving dot to a bar graph. The current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows the operation of the whole system from less than 3V.

Feature:-

  • Drives LEDs, LCDs or Vacuum Fluorescents
  • Expandable to Displays of 100 Steps
  • Internal Voltage Reference from 1.2V to 12V
  • Inputs Operate Down to Ground
  • LED Driver Outputs are Current Regulated,

Specifications:-

  • Analog Controlled LED Driver IC
  • Number of controllable LEDs: 10
  • Operating Voltage: 3V to 18V
  • Input Analog voltage range: 1.2V to 12V
  • LED sink current: 2mA to 30mA (programmable)
  • Both Dot/Bar mode available
  • Can be cascaded to control up to 100 LEDs
  • Available in 18-pin DIP, PLCC package

 

LM3914 Pin Configuration:-

Pin Number

Pen Name

Description

1 and 10 to 18

LED1, LED2, LED3.....LED10

The 10 LEDs which has to be controlled is connected to these pins

2

V- / Ground

Ground pin of the IC

3

V+ / Vcc

Supply Voltage (3-18)V

4

RLO

Low-level voltage for potential divider

5

Signal

Analog signal Input pin based on which the LED is controlled.

6

RHI

High-Level voltage for potential divider

7

REF OUT

Output Reference Voltage for LED current limiting

8

REF ADJ

Adjust pin for voltage reference

9

Mode

Select between Dot/Bar Mode

Where to use LM3914?
The LM3914 is an analog controlled LED driver IC, meaning it can control (turn on or off) 10 LED lights based on an analog input voltage. This IC eliminates the need for microcontroller and programming and also reduces the hardware required to control 10 LEDs.
 
The analog input voltage can vary from 3V to 18V and the LED current can be limited by simply using a single resistor on pin 7 (Ref Out). The IC also has two operating modes DOT mode and BAR mode, also more than one IC can be cascaded to control up to 100 LEDs. Since the LEDs can be controlled without any flickering and flawlessly with equal brightness these IC’s are commonly used in visual alarms and other metering/monitoring applications.  So, if you are looking for an IC to driver your bar LED lights or other sequences of 10 LED then this IC might be of interest to you.
 
How to use an LM3914?
The advantage of using LM3914 is that it requires minimum hardware and can be easily set up. We simply have to connect the 10 LEDs to the IC, set the reference voltages for input voltage and limit the current through the LED and we are all set. The below circuit is a typical application circuit for LM3914.
 

Package Includes:-

    • 1 x  LM3914 IC
     

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