SLVSA73F April 2010  – July 2014 DRV8825

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2Handling Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Timing Requirements
    7. 7.7Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1PWM Motor Drivers
      2. 8.3.2Current Regulation
      3. 8.3.3Decay Mode
      4. 8.3.4Blanking Time
      5. 8.3.5Microstepping Indexer
      6. 8.3.6nRESET, nENBL, and nSLEEP Operation
      7. 8.3.7Protection Circuits
        1. 8.3.7.1Overcurrent Protection (OCP)
        2. 8.3.7.2Thermal Shutdown (TSD)
        3. 8.3.7.3Undervoltage Lockout (UVLO)
    4. 8.4Device Functional Modes
      1. 8.4.1STEP/DIR Interface
      2. 8.4.2Microstepping
  9. Application and Implementation
    1. 9.1Application Information
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Stepper Motor Speed
        2. 9.2.2.2Current Regulation
        3. 9.2.2.3Decay Modes
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
    1. 10.1Bulk Capacitance
    2. 10.2Power Supply and Logic Sequencing
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
    3. 11.3Thermal Protection
      1. 11.3.1Power Dissipation
      2. 11.3.2Heatsinking
  12. 12Device and Documentation Support
    1. 12.1Trademarks
    2. 12.2Electrostatic Discharge Caution
    3. 12.3Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • PWM Microstepping Stepper Motor Driver
    • Built-In Microstepping Indexer
    • Up to 1/32 Microstepping
  • Multiple Decay Modes
    • Mixed Decay
    • Slow Decay
    • Fast Decay
  • 8.2-V to 45-V Operating Supply Voltage Range
  • 2.5-A Maximum Drive Current at 24 V and
    TA = 25°C
  • Simple STEP/DIR Interface
  • Low Current Sleep Mode
  • Built-In 3.3-V Reference Output
  • Small Package and Footprint
  • Protection Features
    • Overcurrent Protection (OCP)
    • Thermal Shutdown (TSD)
    • VM Undervoltage Lockout (UVLO)
    • Fault Condition Indication Pin (nFAULT)

2 Applications

  • Automatic Teller Machines
  • Money Handling Machines
  • Video Security Cameras
  • Printers
  • Scanners
  • Office Automation Machines
  • Gaming Machines
  • Factory Automation
  • Robotics

3 Description

The DRV8825 provides an integrated motor driver solution for printers, scanners, and other automated equipment applications. The device has two H-bridge drivers and a microstepping indexer, and is intended to drive a bipolar stepper motor. The output driver block consists of N-channel power MOSFET’s configured as full H-bridges to drive the motor windings. The DRV8825 is capable of driving up to 2.5 A of current from each output (with proper heat sinking, at 24 V and 25°C).

A simple STEP/DIR interface allows easy interfacing to controller circuits. Mode pins allow for configuration of the motor in full-step up to 1/32-step modes. Decay mode is configurable so that slow decay, fast decay, or mixed decay can be used. A low-power sleep mode is provided which shuts down internal circuitry to achieve very low quiescent current draw. This sleep mode can be set using a dedicated nSLEEP pin.

Internal shutdown functions are provided for overcurrent, short circuit, under voltage lockout and over temperature. Fault conditions are indicated via the nFAULT pin.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
DRV8825HTSSOP (28)9.70 mm × 6.40 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

sch_simp_LVSA73.gif

Microstepping Current Waveform

ustep_waveform_LVSA73.gif