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LM339 Quad   Single   Supply   Comparators
  • LM339
  • LM339
  • LM339
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Description

Quad Single Supply Comparators

Not found, similar datasheet recommended

  • ECAD Module
  • Manufacturer Part Number: LM339
  • Brand: Artschip
  • DateCode: 0640+PB
  • Package / Case: SOP
  • Category: Integrated Circuits (ICs)
  • Warranty: 100% Perfect Functions

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ECAD Module

Product Attributes

  • Product description: LM339 is an integrated circuit that consists of four independent voltage comparators. The device is designed to operate from a single power supply over a wide range of voltages. Features: Wide supply voltage range: 3V to 32V Low power consumption: 3.2mW Outputs are designed for push-pull operation Low input offset voltage: 2mV Hysteresis voltage: 0.8V Input common mode range includes ground Schmitt Trigger Input High Gain: 100V/mV Differential Input Voltage Range: ±15V Output voltage swings rail-to-rail Applications: Motor speed control Temperature control Over-current protection Light intensity control Contact sensing Audio electronics Battery level monitoring (For reference only)

Description

The LM339 is a complete remote control decoder in an 8 pin package. With the addition of a standard infrared receiver module, three individual outputs can be simultaneously controlled using a television remote control transmitter. This circuit responds to Sony television control codes, chosen because most universal remotes default to them when initially powered up. 

The LM339 continuously monitors the stream of data from an infrared receiver module looking for these Sony type remote control codes. If an appropriate three digit code is detected, the selected output either turns on, turns off, or switches its state.

 

Features

● Low power CMOS design - typically 1mA at 5V

● Three separate outputs

● Pulse output for momentary controls

● Signal received output for visual feedback

● Easy interface to standard receiver modules

● Works with universal TV remote transmitters

● High current drive outputs - up to 25mA

 

Water Tank Level Indicator Using LM339

Project Overview

In this project we are going to discuss how to build a water tank level indicator using LM339 as the main component and using few other components. We are going to show four water levels using four LEDs. We are going to use all four differential comparators inside the LM339 IC. Let’s identify our main component LM339 and it’s characteristics.

 

What is LM339?

LM339 is a “Quad Differential Comparators”. In this quad means four hence the LM339 has four differential comparators in a single package.

What is a differential comparator?

Differential comparator is an operational amplifier configuration which compares two inputs and give an output according to the input voltage. 

Output of the differential comparator is always either high or low it doesn’t give a discrete or analog output. Differential comparators have two inputs, named inverting input and non-inverting input. Symbol of a comparator is shown in the below image.

SupplierFile/202008/14/f_527b2585f2d543e1b62d005cf5f6f2f0.png

Figure1 Symbol of differential comparator

 When the voltage level in inverting input is greater than non-inverting input differential comparator will output the low level (this is the voltage connected to -Vcc of the differential comparator). When the voltage level in non-inverting input is greater than voltage level in inverting input differential comparator will output the High level (this is the voltage connected to +Vcc of the differential comparator). Characteristic graph of input Vs output of a differential comparator like LM339 is given below.

SupplierFile/202008/14/f_2c819474f9af42eaba0f852cb31f562a.png

Figure2 Characteristic graph of input Vs output of a differential comparator

There is something special about the output of the LM339. It has open collector output. Which means when the output should be low the output pin will be connected to the GND as it should be. But when the output should be high it is not actually giving out any voltage it will act as a floating connection instead. A large resistance connected to Vcc is used to generate thins to a voltage level.

 

Pinout of LM339

LM339 come in 14 pin or 20 pin packages. As the 14 pin packages are most used, we are going to refer it. As mentioned before LM339 has four differential comparators inside. All four of these differential comparators are powered using a single power supply. Positive voltage input should be connected to the pin number 3 of the package. Pin 12 should be connected to the ground of the power supply. Each differential comparator in LM339 IC have 3 pins each. Below image shows the pinout of the 14 pin package of LM339 IC.

SupplierFile/202008/14/f_a1c5cffb3cce40f1a263538fa96efe06.png

Figure3 Pinout and physical look of LM339 IC

 

From the below image you can get a clear idea how the four differential comparators are configured and connected inside the IC. 

SupplierFile/202008/14/f_05184fc888494a579b57858de840b0ba.png

Figure3 Differential comparator layout  of LM339 IC

 

Main Components

Lets see what are the required components for our project and what are the purpose of the components.

● LM339 Quad Differential Comparators

● BC547 NPN Transistors

● LEDs (Green, Yellow and Red)

● 1MΩ Resistors

● 100kΩ Resistors

● 10kΩ Resistors

● 220Ω Resistors

● Bare copper wires (used as probes)

Let’s find out what are purposes of these main components.

● LM339 Quad Differential Comparators

As mentioned before this the component that sense the water level. To do that we need a voltage difference. 

We are going to use the resistivity difference of the water and air to get this done. This will be explained later in the tutorial.

● BC547 NPN Transistors

LM339 can only drive loads which draws current less than 20mA. But some LEDs can draw more than 20mA of current it can be harmful to LM339 IC to directly drive the LEDs. That is where the BC547 transistor comes in to play. It can drive higher current load using the signal from the LM339 IC’s differential comparator output.

● LEDs and Resistors.

LEDs are used to indicate the water level sensed by LM339 and resistors are used for current limiting and create voltage dividers in this circuit

 

Circuit Diagram of LM339 Water Level Indicator

Shown below is the circuit diagram of the LM339 tank water level indicator circuit. If the tank is full all four LEDs will be turned ON, if three  quarter of the tank is full only the bottom three LEDs will be turned ON. If half of the tank is full only the bottom two LEDs will be illuminated and if tank is filled just more than quarter only the bottom LED will be lit. if the tank is empty none of the LEDs will be illuminated. 

SupplierFile/202008/14/f_8c3f0b58241643d1b9ae00c77b63957e.png

Figure 4 Circuit diagram

How this circuit works.

As you can see in above image there are five bare copper wires act as level probes. Longest one of these wires is connected to GND and other four are connected to one of the four differential comparators each, in the LM339 IC. R1 and R2 are forming a voltage divider of 2.5V it is fed in to inverting input of one of the comparators in LM339 and there R9 and water will form another voltage divider. 

As water have less than 1MΩ resistance it will have less voltage than 2.5V that means when the probe is dip in water comparator output is set to logic low. This means R13 is connected to ground across the LM339 having a small voltage drop hence sending a base current to the BC547 transistor and LED is illuminated. All for differential comparators inside LM339 are connected to similar circuit to achieve four levels.




Preview of the first 3 pages of the data sheet

  • LM339's pdf picture 1
  • LM339's pdf picture 2
  • LM339's pdf picture 3

Related products with the same datasheet

LM339DG
Analog IC
LM339AM
Quad Comparator; Package: SOP; No of Pins: 14; Container: Rail
LM339J
Low Power Low Offset Voltage Quad Comparators

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24LC32B
32K 2.5V IIC Serial EEPROM32K10M,8,EEPROM
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