• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 30 subscribers
  • Views 146 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

TMCS1133: Sensors forum

TMCS1133: PWM duty for diagnostic function

Brian Wang0928
Genius 14060 points
Part Number: TMCS1133

Tool/software:

regarding to the PWM duty for diagnostic function, are there exact threshold/trigger points of Thermal/Sensor current for 20%/50%/80% duty? Thanks!

  • 0
    TI__Expert 8015 points

    Hello,

    Each of the warning conditions has a particular trigger point where it will be enabled, so the duty cycle will always be 100%/80%/50%/20% depending on the alert condition.

    We don't specify the exact temperature where the thermal alert goes off, so there may be some unknown manufacturing variation between parts on where the thermal sensor alerts, but it is generally about the max temperature for the part in operation,165°C. The Sensor diagnostics should be a simple on/off condition based on the internal diagnostic signals.

    Let me know if you still have any questions about this,

    Levi DV

  • 0 in reply to Levi DV
    TI__Genius 14060 points

    Hello Levi,

    Thanks. We're still confused on this function behavior.

    There're three alerts for 80%, 50% and 20% duty cyle. How about trigger point of the 50% and 20% PWM duty cycle? In the chip design, there would have exact design number for trigger points.  

    80% duty for thermal=> You mantioned that the trigger point is that thermal temp is about 165degree.

    50% duty for Sensor =>?  In the d/s it says "A sensor alert occurs in the unlikely event Hall sensor sensitivity or offset is out of range compared with factory set limits" What's exact trigger number?

    20% duty for Sensor and thermal=>?

    Regards

    Brian

    Regards

    Brian

  • 0 in reply to Brian Wang0928
    TI__Expert 8015 points

    Hello Brian,

    Brian Wang0928 said:
    In the d/s it says "A sensor alert occurs in the unlikely event Hall sensor sensitivity or offset is out of range compared with factory set limits" What's exact trigger number?

    There isn't any number associated with sensor diagnostics - all sensor diagnostics are boolean on/off signals that depend on the state of the sensor. If the sensor diagnostics report an error, this alert will trigger.

    Brian Wang0928 said:
    20% duty for Sensor and thermal=>?

    If there is ever a situation where the thermal (80% duty cycle) and sensor (50% duty cycle) would trigger at the same time, this alert will trigger instead to indicate that both alert conditions are present. This is necessary since both alert conditions may trigger simultaneously and share the same pin.

    If you are still confused by this function could you try rephrasing your question? I am not sure I quite understand what your question is.

    Thanks,

    Levi DV