L293D IC are the most common used IC apart from 555 timer IC (which is used to produce time delay). These are used to control the motor which you might often use in your big projects like Drone, CNC Plotter. There you might feel the need of reading the L293D datasheet if you don’t want to blow your Circuit.
These L293d IC are beneficial in the sense that they offer us the to use.
- H-Bridge Circuit
- Providing External Supply other than Microcontroller
Why do we need to use L293d IC
Microcontroller like arduino don’t carry the ability to provide the voltage more than 5V, although many microcontrollers can’t. To run the motor at its high Speed we need Voltage more than that, to overcome either we need to use MOSEFET or Transistor. The Mosefet or transistors allow us to take power from external sources by keeping The Ground of the Power Source as well as Microcontroller Common.
There is one more thing that, we know that motor can run in two directions. If we were to use the motors with the help of transistor (to provide external power) with arduino directly. Then we would not be able to change the direction of the motor unless you have made the H-Bridge over it.
These two limitations are covered by the L293D IC which has both H-Bridge designed in it as well as it supports the use of external Power. Therefore you get two big chunks of circuit removed by this just single IC.
Why do we need to read the L293d Datasheet
The datasheet contains the information about the various IC pins, The L293d IC is 16 pin IC. If you are newbie to the ICs then you can’t remember the function of all the pins. There are total 4 pins to receive the motor inputs to it, that mens you can run two DC motor with the help of it.
There are two pins for grounds and two for taking input from your microcontroller (The pins which you attach to the arduino). There is pin no 8 where you can give the positive end of your external power supply. The negative end of the Power Supply as well as the Arduino Ground should be connected.
Before reading L293D Datasheet
Before Reading the Datasheet of IC, you need to know some basic things about IC. That from where the numbering of pins start on the ICs.
You can observe on your Ic that there is semicircle made over it, it indicates that your IC numbering start from that Side. But from where to its Left or Right?
IC reading starts from the left to the Semicircle if (Semicircle is ahead of you).
Image Description for L293D Datasheet
Enable (1,2): It enables the driver output at 1 and 2 pins.
Input Pins: Here you can give the input to your IC by connecting the wires from Arduino.
Output Pins: These pins give out the Outputs to your Motor.
Vcc 2: It is used for giving the external supply to your IC (in case your microcontroller can’t supply that much of power).
GND: The name suggests, these pins are used as Heat Sinks or you say making Ground Connections. You must connect them to your arduino ground.
Download L293D Datasheet
Now I think you are ready to read the datasheet of the L293D IC which you will understand easily.
Here I am providing you the link to download L293D Datasheet provided by various Sources.