Departments:
  1. Electrical Engineering
  2. Electronics Engineering
  3. Mechatronics Engineering
Modules:
  1. A4988
Softwares:
  1. Proteus
introduction to A4988, a4988 working, a4988 pinout, a4988 features, a4988 applications
Hello friends, I hope you all are doing great. In today's tutorial, we are gonna have a look at detailed Introduction to A4988. The A4988 is a micro-striding driver for governing the stepper motors, it is incorporated with the interpreter (translator) for the tranquil process. By this controller stepper motor can control by 2 pinouts, one pin is to regulate the direction of motor revolutions and other is for steps regulation of motor. It works on 3 to 5.5V and it consumes per phase two amperes current in presence of the proper cooling environment. It consists of an immovable off-time current controller which has the capacity to works in sluggish or assorted falling-off styles. In today's post, we will have a look at its cascading, pinout, sorts, uses, etc. I will also share some links where I have interfaced it with other microcontrollers. You can also ask about it in comments, I will direct you additional about it. So, let's get started with a basic Introduction to A4988.

Introduction to A4988

  • The A4988 is a micro-striding driver for governing the stepper motors, it is incorporated with the interpreter for the tranquil process.
  • This motor driver offers five, unlike step tenacities which are, 1. Complete Step 2. Half (1/2) Step 3. A quarter (1/4) Step 4. Eight (8th) Step and 5. 16-Step. It also has a potentiometer which regulates the output current, over temperature updraft stoppage and crossover current safety.
  • The interpreter of this driver is fundamental to the stress-free employment of the A4988. Only entering one pulse on the stride input drives the motor one micro-step.
  • There is no need for phase classification tables, higher frequency outlines, or multifaceted borders to plug-in.
  • The interfacing of this module is suitable for such applications where a composite microprocessor is inaccessible or is overloaded.
  • During the stepping process, the cutting governer in this module robotically chooses the current falling-off way, sluggish or diversified.
  • In diversified decay style, the expedient is set firstly to a fast deterioration for a magnitude of the steady off-time, then to a slow deterioration for the remains of the off-time.
  • In this module, interior synchronous modify integrated circuit is connected to mend power indulgence during the PWM process.
  • This special integrated circuit consists of thermal cessation with hysteresis, under voltage lockout (UVLO), and crossover-current fortification
  • It is available in superficial mounted QFN cascading (ET), with the dimensions of 5mm x 5mm, having a cascading height of .90mm and an uncovered wad for boosted thermal indulgence.
    introduction to A4988, a4988 working, a4988 pinout, a4988 features, a4988 applications

Pinout of A4988

  • These are the main pinout A4988 which are described below.
Pin# Type Parameters
Pin#4 CP1 It is a charge drive capacitor point.
Pin#5 CP2 It is a charge drive capacitor point.
Pin#6 VCP It is a reservoir capacitor point.
Pin#8 VREG It is controller decoupling point.
Pin#9 MS1 It is a Logic input pinout.
Pin#10 MS2  It is reasoning input pin.
Pin#11 MS3  It is reasoning input pin.
Pin#12 RESET  It is reasoning input pin.
Pin#13 ROSC It is timing setting pin
Pin#14 SLEEP  It is reasoning input pin.
Pin#15 VDD It is the Logic source.
Pin#16 STEP It is reasoning input pin.
Pin#17 REF It is Gm reference voltage input pinout.
Pin#3,18 GND It is ground pinout.
Pin#19 DIR  It is a reasoning input pin
Pin#21 OUT1B DMOS Complete Bridge 1 Output B pin.
Pin#22 VBB1 It is a supply voltage for load.
Pin#23 SENSE1 It is sagacity resistor terminal for Bridge.
Pin#24 OUT1A DMOS Complete Bridge 1 Output A pin.
Pin#26 OUT2A DMOS complete Bridge 2 Output A pin.
Pin#7,20,25 NC It is open pinout.
Pin#1 OUT2B It is DMOS Complete Bridge 2 Output B
Pin#27 SENSE2 Sagacity resistor terminal for Bridge 2.
Pin#28 VBB2 It is a supply voltage for load.Pin#2ENABLEIt is Logic input pinout.
        - PAD It is unshielded wad for improved thermal indulgence.
Let's see a pinout diagram.
introduction to A4988, a4988 working, a4988 pinout, a4988 features, a4988 applications

Features of A4988

  • These are some features of A4988. Let's discuss them.
    • It has a squat RDS (ON)  every output pinout.
    • It has Instinctive current falling-off type assortment.
    • It has Varied and Sluggish current falling-off modes.
    • It provides coetaneous rectification for low-slung power indulgence.
    • This module has an interior UVLO.
    • It provides crossover current fortification.
    • It is well accorded with the 3.3 and 5 v logic source.
    • It has thermal cessation circuit.
    • It also provides fortification from short to ground.

Difference between A4988 and DRV8825

  • Now we discuss differences between A4988 and DRv8825.
    • The DRV8825 proposals to 1/32 striding, while A4988 only steps to 1/16.
    • Both have potentiometer at the dissimilar place.
    • There is no coherence between a reference voltage and current limiter.
    • DRV8825 needs the smallest step pulse period of 1.9us, while A4988 needs 1us.
    • DRV8825 used for high current consuming motors, while A4988 is used for low current consuming motors.
    • In the case of A4988, we need special colling to draw high current but in the case of DRV8825, there is no need for any special colling.

Applications of A4988

  • These are some applications of A4988.
    • As we discussed it is used to control the speed and rotation of stepper motor.
    • It is used in robotics to control their motion.
    • It is used in different toys.
So, friends, it was all about A4988, if you want to know something more about it please ask in comment. Take care until the next tutorial.