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TMS320F2800157: Doubt on PINs which Near PMM

Zane Wei
Intellectual 1965 points

Part Number: TMS320F2800157

Tool/software:

Hi Team,

We have some doubt on PINs Near PMM:

It mentioned that methods to avoid negative noise on pins, does it mean that those pins are weak than others?

Can you give me some examples to protect those pins, better to offer schematic.

Whether need to add TVS, if need, how to select TVS parameter?

Thanks a lot! 

Best regards,

Zane

  • 0
    TI__Mastermind 36526 points

    Hi,

    Zane Wei said:
    It mentioned that methods to avoid negative noise on pins, does it mean that those pins are weak than others?

    Yes. 

    Zane Wei said:
    Can you give me some examples to protect those pins, better to offer schematic.

    The specific actions that the customer should take to protect these pins will be application and implementation specific.

    It will be up to them to make sure that their design does not violate the datasheet specs.

    Best Regards,

    Ben Collier

  • 0 in reply to Benjamin Collier
    TI__Intellectual 1965 points

    Hi Ben,

    Thanks for your reply! My customer want to use PIN61,PIN62 and PIN63 as ePWM.

    1.So do we need TVS to protect those pins?

    2.What should I pay attention to when those pins used as ePWM function?

    Best Regards,

    Zane

  • 0 in reply to Zane Wei
    TI__Mastermind 36526 points

    Zane,

    Zane Wei said:
    1.So do we need TVS to protect those pins?

    If the customer is expecting voltage spikes on these pins, sure. But adding a diode will not prevent all issues. 

    I bring this up to reiterate the fact that the customer must design carefully and test their design, even with TVS on these pins.

    Zane Wei said:
    2.What should I pay attention to when those pins used as ePWM function?

    I'm not sure what you are asking here. We have specs in the datasheet for loads to be driven by any pin. The customer should follow these requirements.

    Best Regards,

    Ben Collier