SLVA488B January   2014  – January 2021 DRV8434 , DRV8811 , DRV8818 , DRV8821 , DRV8824 , DRV8825

 

  1.   Trademarks
  2. 1Introduction and Problem Statement
  3. 2Stepper Motor Control High Level Functions
    1. 2.1 STEP Actuation: Acceleration, Speed Control and Deceleration Profiles
    2. 2.2 Accelerating the Motor
    3. 2.3 Stepper Speed
    4. 2.4 Decelerating the Motor
    5. 2.5 Speed Change
    6. 2.6 Position Control: Number Of Steps
    7. 2.7 Homing the Stepper
  4. 3I2C Protocol and Communications Engine
    1. 3.1 GPIO CONFIG
    2. 3.2 STEPPER CONFIG
    3. 3.3 GPIO OUT
    4. 3.4 Current Duty Cycle
    5. 3.5 START STEPPER
  5. 4Application Schematic
  6. 5Revision History

2.5 Speed Change

During run time, it is possible to change the speed and incur in further acceleration or deceleration as deemed by the application. When the command SpeedUpdate is issued, the firmware checks to see whether the new DesiredSpeed is larger or smaller than the ActualStepperSpeed. The result of this operation configures the Acceleration Deceleration engine accordingly.