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Original question:

MSP430I2020: Clarification on Neutral & Ground Interface

MSP430I2020: Protections and Faults

Will Mcknight
Prodigy 10 points
Part Number: MSP430I2020

Tool/software:

Hi There,

I am new to E-metering, and having circuits reference neutral and/or earth.

When I look at tidu454a page 13, I see the MSP430I2020 also references neutral. Assuming the circuit is completely enclosed and a user has no access to the circuit, and not thinking about how development is more dangerous due to the circuit being potentially "live", are there any AC Source fault conditions where the MSP430 could fail? IE, brown-outs, Line to Line shorts, either phase to earth short, anything at all? What if the circuit has to pass CE (so surge and all that)?

Cheers, Will

 

 

  • 0
    TI__Mastermind 33875 points

    I think you can use a low DC voltage(< 3.3v) to monitor the failed condition, due to all the signals input to the MSP430 is <= vdd 3.3v to do the debug

  • 0 in reply to Gary Gao
    Prodigy 10 points

    Hi Gary, thanks for getting back but I'm not seeing how this is answering my questions? Please answer both or one of the questions specifically

  • 0
    TI__Mastermind 33875 points
    Will Mcknight said:
    ot thinking about how development is more dangerous due to the circuit being potentially "live"

    It is dangerous due to the AC voltage verify high, right? But this high voltage can't be sampled by MSP430 directly, due to MSP430 can just sample voltage that lower than the reference that should be lower than VDD(let say 3.3v), so you need to convert the high voltage to a voltage <3.3v signal, my point here is that you can use a signal that <3.3v to simulate the failure condition of the AC source like short or some.

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