SLVSA73F April   2010  – July 2014 DRV8825

PRODUCTION DATA.  

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

6 Pin Configuration and Functions

po_lvsa06.gif

Pin Functions

PIN I/O(1) DESCRIPTION EXTERNAL COMPONENTS
OR CONNECTIONS
NAME NO.
POWER AND GROUND
CP1 1 I/O Charge pump flying capacitor Connect a 0.01-μF 50-V capacitor between CP1 and CP2.
CP2 2 I/O Charge pump flying capacitor
GND 14, 28 — Device ground
VCP 3 I/O High-side gate drive voltage Connect a 0.1-μF 16-V ceramic capacitor and a 1-MΩ resistor to VM.
VMA 4 — Bridge A power supply Connect to motor supply (8.2 to 45 V). Both pins must be connected to the same supply, bypassed with a 0.1-µF capacitor to GND, and connected to appropriate bulk capacitance.
VMB 11 — Bridge B power supply
V3P3OUT 15 O 3.3-V regulator output Bypass to GND with a 0.47-μF 6.3-V ceramic capacitor. Can be used to supply VREF.
CONTROL
AVREF 12 I Bridge A current set reference input Reference voltage for winding current set. Normally AVREF and BVREF are connected to the same voltage. Can be connected to V3P3OUT.
BVREF 13 I Bridge B current set reference input
DECAY 19 I Decay mode Low = slow decay, open = mixed decay,
high = fast decay.
Internal pulldown and pullup.
DIR 20 I Direction input Level sets the direction of stepping. Internal pulldown.
MODE0 24 I Microstep mode 0 MODE0 through MODE2 set the step mode - full, 1/2, 1/4, 1/8/ 1/16, or 1/32 step. Internal pulldown.
MODE1 25 I Microstep mode 1
MODE2 26 I Microstep mode 2
NC 23 — No connect Leave this pin unconnected.
nENBL 21 I Enable input Logic high to disable device outputs and indexer operation, logic low to enable. Internal pulldown.
nRESET 16 I Reset input Active-low reset input initializes the indexer logic and disables the H-bridge outputs. Internal pulldown.
nSLEEP 17 I Sleep mode input Logic high to enable device, logic low to enter low-power sleep mode. Internal pulldown.
STEP 22 I Step input Rising edge causes the indexer to move one step. Internal pulldown.
STATUS
nFAULT 18 OD Fault Logic low when in fault condition (overtemp, overcurrent)
nHOME 27 OD Home position Logic low when at home state of step table
OUTPUT
AOUT1 5 O Bridge A output 1 Connect to bipolar stepper motor winding A.
Positive current is AOUT1 → AOUT2
AOUT2 7 O Bridge A output 2
BOUT1 10 O Bridge B output 1 Connect to bipolar stepper motor winding B.
Positive current is BOUT1 → BOUT2
BOUT2 8 O Bridge B output 2
ISENA 6 I/O Bridge A ground / Isense Connect to current sense resistor for bridge A.
ISENB 9 I/O Bridge B ground / Isense Connect to current sense resistor for bridge B.
(1) Directions: I = input, O = output, OD = open-drain output, IO = input/output