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MSP432E411Y: NMI polarity (Active low/high?)

rei
Mastermind 6155 points
Part Number: MSP432E411Y
Other Parts Discussed in Thread: TPS2051B, TPS2051, TPS3852

Hi,
I have questions about NMI on MSP432E411Y.

TRM "4.1.3.1 NMI Pin" Description：
The active sense of the NMI signal is high; asserting the enabled NMI signal above VIH initiates the NMI interrupt sequence.

I thought the enabled NMI signal is Low signal. Is the enabled NMI signal High signal?
For example, in MSP432E411Y-BGAEVM, it is connected TPS2051B /OC--NMI, so I think it will be asserted low signal.
And, is it possible to change the polarity of Active (assert)?

Regards, Rei

  • 0
    TI__Mastermind 28745 points

    Hello Rei,

    I would definitely trust the TRM over the EVM.  Seems pretty clear that NMI is actually active high and I don't see any way to change the NMI polarity.

    You can interrupt on the GPIO itself, but it won't be nearly as high of a priority as the NMI.  

    Thanks,

    JD

      

  • 0 in reply to JD Crutchfield
    Mastermind 6155 points

    Hi JD,

    Thank you for your reply. I understand TRM is correct.
    By the way, during overcurrent, TPS2051 fault signal will low.

    Does it mean that EVM connection is wrong?

    And customers want to use TPS3852,
    I don’t think it can be used like "Typical Application Circuit".


    Is there any other way than inserting NOT circuit between NMI?

    Regards, Rei

  • 0 in reply to rei
    TI__Mastermind 28745 points

    Hey Rei,

    The EVM might be incorrect.  I've sent off a note to the team to take a look at this.  As mentioned in my last email, because NMI is shared with a standard GPIO, you can configure the pin for an active low GPIO interrupt, it's just not as high of a priority as NMI.    

    You could put an external inverter on the signal to use NMI, here is an $.02 option from TI: https://www.ti.com/product/SN74LVC1G04 

    Thanks,

    JD

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