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HomeCommunitySubjectA4988 DMOS Microstepping Driver: Datasheet, Pinout, and DRV8825 vs. A4988

A4988 DMOS Microstepping Driver: Datasheet, Pinout, and DRV8825 vs. A4988

ALLEGRO MICROSYSTEMS - A4988SETTR-T - DMOS Microstepping Driver with Translator and Overcurrent Protection IC in QFN-28 Package

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Sep 13, 2021

Elsie Buck

How To Control a Stepper Motor with A4988 Driver and Arduino

 

ALLEGRO MICROSYSTEMS - A4988SETTR-T - DMOS Microstepping Driver with Translator and Overcurrent Protection IC in QFN-28 Package

The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. This post mainly covers its datasheet, pinout, typical Application Circuit and more detailed information about A4988.

A4988SETTR-T

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A4988 Pinout

A4988 Pinout

 

A4988 Pin Circuit Diagrams

A4988 CAD Model

A4988 Symbol

 

A4988 Footprint

 

A4988 3D Model

A4988 Description

The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4988 includes a fixed off-time current regulator which has the ability to operate in slow or mixed decay modes.

Specifications

Allegro MicroSystems A4988SETTR-T technical specifications, attributes, parameters and parts with similar specifications to Allegro MicroSystems A4988SETTR-T.

A4988SETTR-T Tech Specifications

Allegro MicroSystems A4988SETTR-T technical specifications, attributes, parameters and parts with similar specifications to Allegro MicroSystems A4988SETTR-T.

Product Attribute Attribute Value
Factory Lead Time8 Weeks
MountSurface Mount
Mounting TypeSurface Mount
Package / Case28-VFQFN Exposed Pad
Number of Pins28Pins
Operating Temperature-20°C~150°C TJ
PackagingTape & Reel (TR)
Published2005
JESD-609 Codee3
Pbfree Codeyes
Part StatusActive
Moisture Sensitivity Level (MSL)2 (1 Year)
Number of Terminations28Terminations
ECCN CodeEAR99
Terminal FinishMatte Tin (Sn)
Product Attribute Attribute Value
ApplicationsGeneral Purpose
Voltage - Supply3V~5.5V
Terminal PositionQUAD
Peak Reflow Temperature (Cel)260
Supply Voltage3.3V
Terminal Pitch0.5mm
Time@Peak Reflow Temperature-Max (s)40
Base Part NumberA4988
FunctionDriver - Fully Integrated, Control and Power Stage
Number of Outputs2Outputs
Output Voltage35V
Supply Voltage-Max (Vsup)5.5V
Supply Voltage-Min (Vsup)3V
Number of Channels4Channels
InterfaceLogic
Product Attribute Attribute Value
Output ConfigurationHalf Bridge (4)
Forward Current1A
Supply Current-Max (Isup)8mA
Forward Voltage500mV
Voltage - Load8V~35V
Motor TypeStepper
Motor Type - StepperBipolar
Step Resolution1, 1/2, 1/4, 1/8, 1/16
Height2.087mm
Length4.5mm
Width2.79mm
REACH SVHCUnknown
Radiation HardeningNo
RoHS StatusROHS3 Compliant
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A4988 Features

  • Low Rds(on) outputs

  • Automatic current decay mode detection/selection

  • Mixed and slow current decay modes

  • Synchronous rectification for low power dissipation

  • Internal UVLO

  • Crossover-current protection

  • 3.3 and 5 V compatible logic supply

  • Thermal shutdown circuitry

  • Short-to-ground protection

  • Shorted load protection

  • Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16

 

A4988 Functional Block Diagram

The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation with minimal control lines. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth, and sixteenth-step modes. The currents in each of the two output full-bridges and all of the N-channel DMOS FETs are regulated with fixed off-time PWM (pulse-width modulated) control circuitry. A functional block diagram is shown below.

A4988 Functional Block Diagram

A4988 Typical Application Circuit

A4988 Typical Application Diagram

A4988 Application Layout

A4988 Application Layout

 

A4988 Manufacturer

As a leading company in the development, manufacture and market of high-performance semiconductors, Allegro MicroSystems, LLC provides high-growth applications for the automotive market and also stays focus on consumer/communications, automation and industrial solutions. Headquartered in Worcester, Massachusetts (USA) Allegro locates its design, applications and sales support centres worldwide.

A4988 Package

Datasheet PDF

Download datasheets and manufacturer documentation for Allegro MicroSystems A4988SETTR-T.

A4988SETTR-T Documents

Download datasheets and manufacturer documentation for A4988SETTR-T

Datasheets
A4988

Frequently Asked Questions

What is A4988?
The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4988 includes a fixed off-time current regulator which has the ability to operate in slow or mixed decay modes.
How do I control a stepper motor with an A4988 Driver and an Arduino?
The A4988 is a micro-stepping driver for controlling bipolar stepper motors which has a built-in translator for easy operation. This means that we can control the stepper motor with just 2 pins from our controller, or one for controlling the rotation direction and the other for controlling the steps.
Where can I find A4988 stepper motor driver specifications?
It has five sets of breakout boards for Allegro’s A4988 micro stepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and five different microstep resolutions (down to 1/16-step).lectable step modes: full, 1/2, 1/4, 1/8, and 1/16.
How do you calculate the A4988 vref?
Per the A4988 datasheet, the calculation for the maximum trip current is: I_TripMax= Vref/(8*Rs)
How do I use A4988 microstepping?
If you look at the datasheet for the A4988 you will find all the information you need. Table 2 shows how the select lines should be set for whatever level of microstepping you require:
Where can I find the A4988 Arduino library download?
A4988, DRV8825, DRV8834, DRV8880 and generic two-pin stepper motor driver library.
How do I make a stepper motor with an A4988 driver?
The A4988 is a dual H bridge with added safety features. An H Bridge is a circuit that can send power to a motor forward, backward, or not at all, based on your commands. The A4988 is dual because it has two H bridges, one for each pair of wires attached to the stepper motor. The A4988 specifically can drive up to 1 amp continuous, and up to 2 with extra cooling. The chip also handles the chore of remembering the correct sequence of H bridge changes to make your stepper motor move. You only need to tell the driver which direction and when to step.
Where can I find a heatsink for A4988 or DRV8825 stepper motor drivers?
Heatsink for A4988 or DRV8825 stepper motor drivers.
What is the maximum current for an A4988?
This stepper motor driver lets you control one bipolar stepper motor at up to 2A output current per coil (see the Power Dissipation Considerations section below for more information). Here are some of the driver’s key features.
Where can I find an A4988 wiring diagram?
I've been following this tutorial on wiring and setting up the Pololu A4988 with a small bipolar stepper motor. I have followed the directions closely, however when I get to the point where I measure the reference voltage using the potentiometer on the board I get 0. I have provided the correct wiring and a picture of mine. In my picture, I have removed the motor wires for clarity.
Is there schematic diagram of the A4988 stepper motor driver?
Schematic diagram of the A4988 stepper motor driver carrier (both green and black editions).
FAQ
What is A4988?
The A4988 is a complete micro-stepping motor driver with a built-in translator for easy operation. It is designed to operate bipolar stepper motors in full-, half-, quarter-, eighth-, and sixteenth-step modes, with an output drive capacity of up to 35 V and ±2 A. The A4988 includes a fixed off-time current regulator which has the ability to operate in slow or mixed decay modes.
How do I control a stepper motor with an A4988 Driver and an Arduino?
The A4988 is a micro-stepping driver for controlling bipolar stepper motors which has a built-in translator for easy operation. This means that we can control the stepper motor with just 2 pins from our controller, or one for controlling the rotation direction and the other for controlling the steps.
Where can I find A4988 stepper motor driver specifications?
It has five sets of breakout boards for Allegro’s A4988 micro stepping bipolar stepper motor driver features adjustable current limiting, over-current and over-temperature protection, and five different microstep resolutions (down to 1/16-step).lectable step modes: full, 1/2, 1/4, 1/8, and 1/16.
How do you calculate the A4988 vref?
Per the A4988 datasheet, the calculation for the maximum trip current is: I_TripMax= Vref/(8*Rs)
How do I use A4988 microstepping?
If you look at the datasheet for the A4988 you will find all the information you need. Table 2 shows how the select lines should be set for whatever level of microstepping you require:
Where can I find the A4988 Arduino library download?
A4988, DRV8825, DRV8834, DRV8880 and generic two-pin stepper motor driver library.
How do I make a stepper motor with an A4988 driver?
The A4988 is a dual H bridge with added safety features. An H Bridge is a circuit that can send power to a motor forward, backward, or not at all, based on your commands. The A4988 is dual because it has two H bridges, one for each pair of wires attached to the stepper motor. The A4988 specifically can drive up to 1 amp continuous, and up to 2 with extra cooling. The chip also handles the chore of remembering the correct sequence of H bridge changes to make your stepper motor move. You only need to tell the driver which direction and when to step.
Where can I find a heatsink for A4988 or DRV8825 stepper motor drivers?
Heatsink for A4988 or DRV8825 stepper motor drivers.
What is the maximum current for an A4988?
This stepper motor driver lets you control one bipolar stepper motor at up to 2A output current per coil (see the Power Dissipation Considerations section below for more information). Here are some of the driver’s key features.
Where can I find an A4988 wiring diagram?
I've been following this tutorial on wiring and setting up the Pololu A4988 with a small bipolar stepper motor. I have followed the directions closely, however when I get to the point where I measure the reference voltage using the potentiometer on the board I get 0. I have provided the correct wiring and a picture of mine. In my picture, I have removed the motor wires for clarity.
Is there schematic diagram of the A4988 stepper motor driver?
Schematic diagram of the A4988 stepper motor driver carrier (both green and black editions).

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