SLLA663 March   2025 MCF8315A , MCF8315C , MCF8315C-Q1 , MCF8315D , MCF8316A , MCF8316C-Q1 , MCF8316D , MCF8329A , MCT8315A , MCT8316A , MCT8329A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2End Application Configuration Recommendation
    1. 2.1 Resynchronization
    2. 2.2 Reverse Drive
    3. 2.3 Coasting (Hi-Z)
    4. 2.4 Startup Brake
    5. 2.5 Direction Change Mode
  6. 3Tuning Guidance
    1. 3.1 Initial Speed Detection Module
      1. 3.1.1 Initial Speed Detection
      2. 3.1.2 ISD Times
      3. 3.1.3 Stationary Detect Threshold
    2. 3.2 Resynchronization
      1. 3.2.1 Forward Drive Resync Threshold
      2. 3.2.2 Reverse Drive
      3. 3.2.3 Reverse Acceleration Parameters
      4. 3.2.4 Reverse Drive Current Limits
      5. 3.2.5 Reverse Drive Handoff Threshold
      6. 3.2.6 Reverse Drive Open Loop Deceleration (REV_DRV_OPEN_LOOP _DEC)
    3. 3.3 Coasting (Hi-Z)
    4. 3.4 Brake
      1. 3.4.1 Brake Config (BRK_CONFIG)
  7. 4Feature Availability of MCx Devices
    1. 4.1 FOC Family (MCF83xx devices)
    2. 4.2 TRAP Family (MCT83xx devices)
  8. 5Summary
  9. 6References

3.4.1 Brake Config (BRK_CONFIG)

This parameter configures the brake exit mode for example, time-based brake or current based brake with brake time as a timeout.

Time Based Brake. Exits Brake After Configured 1s Brake TimeFigure 3-21 Time Based Brake. Exits Brake After Configured 1s Brake Time
Current Based Braking : Brake Exit Based on Current Threshold. Figure 3-22 Current Based Braking : Brake Exit Based on Current Threshold.
Current Based Braking : Brake Exit Based on Current Brake Timeout Figure 3-23 Current Based Braking : Brake Exit Based on Current Brake Timeout

In Figure 3-22, brake is released when brake current falls below BRK_CURR_THR as the brake timeout is set to 10s. In Figure 3-23, brake is forced to release after 500ms due to brake timeout even through brake current is higher than BRK_CURR_THR.

Motor not Stationary Before Start Scenarios: Exits Brake too Early While Motor Still Spinning Due to Low Brake Time Figure 3-24 Motor not Stationary Before Start Scenarios: Exits Brake too Early While Motor Still Spinning Due to Low Brake Time
Motor not Stationary Before Start Scenarios: Exits Brake too Early While Motor Still Spinning due to High Brake Current Threshold Figure 3-25 Motor not Stationary Before Start Scenarios: Exits Brake too Early While Motor Still Spinning due to High Brake Current Threshold