Pololu DRV8825 User Manual

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POLOLU DRV8825 STEPPER MOTOR DRIVER
CARRIER, HIGH CURRENT
USER’S GUIDE
USING THE DRIVER
Minimal wiring diagram for connecting a microcontroller to a
DRV8824/DRV8825 stepper motor driver carrier (full-step mode).
POWER CONNECTIONS
The driver requires a motor supply voltage of 8.2 – 45 V to be connected across
VMOT and GND. This supply should have appropriate decoupling capacitors close to
the board, and it should be capable of delivering the expected stepper motor current.
Warning: This carrier board uses low-ESR ceramic capacitors, which makes it
susceptible to destructive LC voltage spikes, especially when using power leads longer
than a few inches. Under the right conditions, these spikes can exceed the 45 V

Pololu DRV8825 Specifications

General

Brand	Pololu
Model	DRV8825
Category	Controller
Language	English

Summary

Using the DRV8825 Stepper Motor Driver

Power Connections and Supply

Details motor power supply voltage requirements, decoupling capacitors, and warnings.

Stepper Motor Connections

Explains connecting four, six, and eight-wire motors, and warns against hot-plugging.

Microstepping and Resolution

Describes microstepping, resolution selection via MODE pins, and current limit requirements.

Control Inputs and States

Details STEP, DIR, RESET, SLEEP, and ENBL pins for controlling motor movement and power states.

Current Limiting Configuration

Explains setting the motor current limit using the trimmer potentiometer for protection.

Power Dissipation and Cooling

Discusses power dissipation limits, heat management, and required cooling for higher currents.

Schematic Diagram and Pinout

Presents the detailed circuit schematic and pin connections for the DRV8825 carrier.

DRV8825 vs. A4988 Comparison

Highlights key differences in features, pin usage, and specifications between DRV8825 and A4988.