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TMS320F280049M: F280049M BOR Tripout condition

Bard Ciou
Intellectual 900 points

Part Number: TMS320F280049M

Dear All.

We saw the BOR trip point had already removed in F280049M data sheet.

I would like to confirm the brownout reset timing and voltage level is same as Piccolo-B device or not.

Could you confirm the BOR trip point still 2.5~2.96V same as F28035 device? RIGHT?

And the time after BOR/POR/OVR event is removed to XRS release still 400~800usec?

thansks for your comment.

Best Regards,

  • 0
    TI__Mastermind 28275 points

    Hi Bard,

    The BOR characteristics of the F280049M is not the same as that of the F28035. In addition, the BOR on the F280049M is currently unsupported. Users are advised to use an external supervisor to monitor the rails.

  • 0 in reply to Frank Ankapong
    TI__Intellectual 900 points

    Hi Frank,

    Thanks for your reply.

    For power application there should be lots of noisy signal coupling cause V33D unstable.

    The V33D unstable will cause the device work abnormally like EPwm be turn off.

    The extra supervisor IC will increase the BOM cost and board space, we need to know what's the benefit to add the supervisor.

    Did we meet what's problem during develop and we need to rely on the supervisor IC to monitor the rails?

    Best Regards,

    Bard

  • 0 in reply to Bard Ciou
    TI__Mastermind 28275 points

    Hi Bard,

    The F280049M device has recommended operating conditions for the rails. Basically a supervisor IC is to ensure safety. If the rails go outside the recommended operating conditions of the device, the supervisor IC is there to reset the device so it is no longer running code. This is because the device is being run outside it's recommended operating conditions so you can't rely on the code that is being run.

    If you think your system could ever be in a state that the noise on the rails could place the device outside the recommended operating conditions of the device, then you should add a supervisor IC.