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TMS320F280049: Thermal management for achieving functional safety.

Tomotaroh Kohro
Mastermind 20895 points

Part Number: TMS320F280049

Hi Support team.

When customer wants to implement thermal management, does TI have the thermal management guide line.

So, I would like to know if functional safety required the behavior of thermal management point of view.

For example, System should down the system when Tj will reach operational maximum junction temperature. Or , customer can make some behavior this thermal management.

Also TI’s other SoC has hardware thermal shutdown mechanism when Tj reaches 125C. I would like to know if TMS320F28004x has similar feature.

Best Regards

KORO

  • 0
    TI__Mastermind 45606 points
    Hi KORO,

    I'll need to get back to you on this as I didn't have a whole lot of time today to look into it.

    I don't believe there's a thermal shutdown mechanism integrated into the device. There is an analog temperature sensor, but you'd have to design this into your application and sample it it using the ADC.

    Best,
    Kevin
  • 0
    TI__Expert 7835 points

    Hi KORO,

    We do not have a hardware mechanism for thermal shutdown. We have a built-in temperature sensor, which could be read by ADC and user can implement the over-temperature shutdown logic in software. This is a safety mechanism defined in our safety manual as below. Thanks.

    6.1.19  Online Monitoring of Temperature
    The internal temperature sensor measures the junction temperature of the device. The output of the sensor can be sampled with the ADC through an internal connection. This can be enabled on channel ADCIN14 on ADCB by setting the ENABLE bit in the TSNSCTL register.

    BR

    Han

  • 0 in reply to Han Zhang6
    TI__Mastermind 20895 points

    Hello Han-san.


    Thanks a lot for your quick reply.

    It is very helpful for us.

    Regarding safety manual, I would like to know if the safety manual defines the action to take when Tj reaches the maximum temperatuer . Or should action be decided by customer ?

    Best Regards

    KORO

  • 0 in reply to Tomotaroh Kohro
    TI__Expert 7835 points
    Hi KORO-san,

    We do not define action to take during failure. It is up to the system integrator to define the appropriate action to take the system into safe state based on their safety goal. Thanks.

    BR
    Han