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EM Immunity of Hercules Safety MCUs

Lorenz Gruebler
Expert 1075 points
Other Parts Discussed in Thread: TMS570LS20216

Hello Forum/Engineers,

I am planning to use TI Hercules MCUs (TMS570LS31xx with included Ethernet and ZWT Housing). I've some concern about the EM Immunity of the Hercules MCUs because the application is suited in the railway sector (high electrical/magnetical fields).

When I read the Safety Manual of the TMS570LS20216S (V 1.0.4) there is mentioned that the product should not exposed to high frequent (> 1MHz) magnetic fields larger than 1.07 A/m . In the actual version of the Safety Manual for the Hercules MCUs there I can't find such restrictions.

Q: What are the restrictions for the TMS570LS31xx regarding the electrical/magnetical field immunity and exists there any detailed description (is 1.07 A/m just for frequency components > 1MHz)?

regards,

logan

  • 0
    TI__Genius 13810 points

    Due to the bench limitation, we can only test the field immunity to 500v/m and 1.33A/m from 1MHz to 2GHz. Then, leave 20% margin, it is 400v/m and 1.07A/m. That is why I put this vales in the TMS570LS20216 safety manual.

    There might be a plan to rent instruments to test to a higher limit and wide frequency range. But I am not sure due to financial reasons.

    Regards,

    Haixiao

  • 0 in reply to Haixiao Weng
    Expert 1075 points

    Hello Haixiao,

     

    Thank for the reply,

    I guess these limits are just valid for frequency components > 1MHz and also valid for other derivates of the TMS570 series (may depending on the manufacturing process). Can this be confirmed?

    Regards,

    Lorenz

  • 0 in reply to Lorenz Gruebler
    TI__Genius 13810 points

    For frequency below 1MHz, the coupling between the MCU and the EM field is very weak since the frequency is low. The limit should be several orders higher. Usually, it is not a big concern for EMC.

    It is sth depending on the manufactuing process, sure. But since I did not see a fail during the test, I am not sure what the real limit is even in the range 1MHz~2GHz.

    Regards,

    Haixiao

  • 0 in reply to Haixiao Weng
    Expert 1075 points

    Hello Haixiao,

    so there should not be any problem for real world applications.

    thank you for answering

    Lorenz