DRV8825 Stepper Motor Driver Module

26 August 2019 - 0 Comments

DRV8825 Stepper Motor Driver Module

DRV8825 Stepper Motor Driver Module Pinout

The DRV8825 is a Motor Driver with two H-bridge drivers and a microstepping indexer. The driver has a maximum output capacity of 45 V and ± 2.5 A. It can operate bipolar stepper motors in full, 1/2, 1/4, 1/8, 1/16 and 1/32-step modes. This driver module is generally used in Robotics, ATMs and Gaming Machines.

Pin Configuration

Pin Name	Description
VDD & GND	Connected to 5V and GND of Controller
VMOT & GND MOT	Used to power the motor
B1, B2 & A1, A2	Output Pins, Connected to the 4 Wires of motor
DIRECTION	Motor Direction Control pin
STEP	Steps Control Pin
M0, M1, M2	Microstep Selection Pins
FAULT	Fault Detection Pin
SLEEP	Pins For Controlling Power States
RESET
ENABLE

DRV8825 Stepper Driver Module Specification

Max. Operating Voltage: 45 V
Min. Operating Voltage: 8.2 V
Max. Current Per Phase: 2.5 A
PCB Size: 15 mm x 20 mm

Features

Six step resolution: Full step, ½ step, ¼ step, 1/8, 1/16 and 1/32 step
Adjustable output current via potentiometer
Automatic current decay mode detection
Over temperature shutdown circuit
Under-voltage lock out
Over current shutdown

Alternatives for DRV8825: A4988, A498, L6474, L6207, L6208, TMC2208, TMC2209

Note: Complete Technical Details can be found at the DRV8825 datasheet given at the end of this page.

How to Use DRV8825 Driver Module

Interfacing diagram for DRV8825 is shown below. Using DRV8825 you can control the stepper motor using very few pins. The module has a pinout and interface that are nearly identical to those of the A4988 stepper motor driver carrier.

How to Use DRV8825 Driver Module: Circuit Diagram

As shown in the above diagram, DIR, STEP and FAULT pins of the module are connected with microcontroller to drive the stepper motor. STEP pin used to control the steps while DIR pin is used to control direction. The DRV8825 also features a FAULT pin, Fault pin is shorted to SLEEP pin so, whenever the Fault pin is driven LOW, the whole chip is disabled. Microstep pins (M0, M1 and M2) are used to operate the driver module in different step functions. In the above circuit M0, M1, and M2 pins left disconnected, that means the driver will operate in full-step mode. DRV8825 has low-ESR ceramic capacitors onboard, which makes it vulnerable to voltage spikes. So it is recommended to put an at least 47µf capacitor across the motor power supply pins. It is commonly used in controlling the NEMA series stepper motors like NEMA17, NEMA23, NEMA34