OC06 - Stepper Driver (PCA9685 & DRV8825)

Overview

The OC06 xCHIP uses DRV8825 Stepper Motor Controller to precisely drive and control a connected stepper motor. The DRV8825 is interfaced with I2C through a PCA9554A I/O Expander which provides all the required control signals.

Product highlights

• Stepper Motor Controller/Driver
• Connects a Single Stepper via Screw Terminals
• External Motor Supply Input via Screw Terminal (Max 47 V)
• 2.5 A Continuous Motor Output Current
• Built-In Microstepping Indexer
• Up to 1/32 Microstepping

Specifications

DRV8825

• PWM Microstepping Stepper Motor Driver:
  1. Built-In Microstepping Indexer
  2. Up to 1/32 Microstepping
• Multiple Decay Modes:
  1. Mixed Decay
  2. Slow Decay
  3. Fast Decay
• 8.2-V to 45-V Operating Supply Voltage Range
• 2.5-A Maximum Drive Current at 24 V and
• Low Current Sleep Mode
• Protection Features:
  1. Overcurrent Protection (OCP)
  2. Thermal Shutdown (TSD)
  3. VM Undervoltage Lockout (UVLO)
  4. Fault Condition Indication Pin (nFAULT)

PCA9554A

• 400-kHz Fast I²C Bus
• Three Hardware Address Pins Allow up to Eight I²C Addresses
• Internal Power-On Reset
• No Glitch on Power Up
• Latched Outputs With High-Current Drive

Datasheet

DRV8825 Datasheet

PCA9554A Datasheet