SDAA481 August   2026 MSPM33C321A , MSPM33C321A-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Getting Started With MSPM33 Motor Control
  6. 3Stepper Motor Control
    1. 3.1 Background
    2. 3.2 Software Architecture
    3. 3.3 Block Diagrams
    4. 3.4 Hardware Support
  7. 4BLDC Sensored Trap Control
    1. 4.1 Background
    2. 4.2 Software Architecture
    3. 4.3 Block Diagrams
    4. 4.4 Hardware Support
  8. 53-Phase Sensorless FOC Control
    1. 5.1 Background
    2. 5.2 Software Architecture
    3. 5.3 Block Diagrams
    4. 5.4 Hardware Support
  9. 6Summary
  10. 7References

3.3 Block Diagrams

The system hardware architecture is built upon MSPM33C321A and DRV8962 four-channel half-bridge driver, forming a highly integrated, closed-loop field-oriented control (FOC) stepper motor drive system.

As shown in Figure 3-3, the interconnected signals and topology are described as follows:

  • 4 PWM signals with center-aligned or edge-aligned synchronization (PWM 4x)

  • 12-bit DAC reference voltage for hardware current regulation (VREF)

  • Low-power mode signal for drivers with sleep mode pin (nSLEEP)

  • Logic-low fault signal from driver (nFAULT)

  • High-precision analog current feedback from external INA240A1 current sense amplifiers into the MCU high-speed ADC (Current)

  • Quadrature encoder signals or SPI interface from the magnetic encoder to feed back real-time motor rotor angle and position (ABZ / SPI)

Block Diagram for 4-PWM Interface for Stepper Motor Control Figure 3-3 Block Diagram for 4-PWM Interface for Stepper Motor Control