• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 83 subscribers
  • Views 1255 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.

TMS320F28377D: Temperature Sensor Accuracy

Amtech
Genius 4585 points

Part Number: TMS320F28377D

Hi All,

There is a internal junction temperature measurement facility in TMS320F28377D. But how can i use as it has very poor accuracy?? Can i improve accuracy by any software or hardware modification??

This is unusable feature. If there is 50°C  junction temperature then sensor output may be 35°C to 65°C.

Thanks and Regards,

Maulik Timbadiya

  • 0
    Guru 192875 points

    Hi Maulik,

    Amtech said:
    There is a internal junction temperature measurement facility in TMS320F28377D. But how can i use as it has very poor accuracy?? Can i improve accuracy by any software or hardware modification??

    Nope, you cannot. Basically this Temperature Sensor is not for industrial measurement and simply put to test the ADC channel (Is what I feel!). If you test the same in lab environment, you can observe a deviation of 3-5dC. But one doesn't know, how it would behave when out in field.

    Regards,

    Gautam

  • 0 in reply to Gautam Iyer
    TI__Guru 60865 points
    Hi Maulik,

    The absolute accuracy is indeed as specified in the datasheet. The limitation here is in calibration, not the sensor itself. The sensor + ADC system is quite linear and repeatable (to about 1 deg. C).

    You can use this as a rough sanity check of the junction temperature - is it hot, nominal, or cold?

    You can also use the sensor if you provide your own calibration data.

    For instance, if you production test your end system at the maximum rated temperature you could also capture a temp sensor sample at this time. Later, when the system is deployed, you can trigger an alarm/shutdown when the system exceeds the temperature that it was tested at.
  • 0 in reply to Devin Cottier
    Guru 192875 points
    Devin, one of the questions still remains unanswered. Why embed such a temperature sensor? For demo examples or any internal specific purpose?