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TMS320F2800156-Q1: customized FMEDA

Samuel Li
Intellectual 410 points

Part Number: TMS320F2800156-Q1
Other Parts Discussed in Thread: MIDAS

Tool/software:

I am researching customized FMEDA, and the following image is the report I generated. Do you know how “Fail rate non-safe Fault” value came about? In my opinion, Fail rate non-safe Fault = Residual Fault failure rate+( Lambda MPF, primary)+( Lambda MPF, secondary), but the calculate result seems wrong, could you give me any idea?

  • 0
    TI__Mastermind 30061 points

    Samuel,

    I agree with you. There seems to be something off about the calculation. Let me look into this a little closer and get back to you in 1 to 2 days.

    Btw, the notes on this table refer to Figure 10 in the ISO26262 (2018) standard, part 10.

  • 0 in reply to Gus Martinez
    TI__Mastermind 30061 points

    Samuel,

    I was able to find more information. There is no issue with the safety report. The explanation is as follows.

    The component CPU1CORE is made up of different subparts. Some of those subparts are used for diagnostic purposes only. The failure rate in these diagnostic subparts is correctly not included in Lambda nS. This is the reason non-safe Fault != Residual Fault failure rate+( Lambda MPF, primary)+( Lambda MPF, secondary). Instead total safety related faults = Residual Fault failure rate+( Lambda MPF, primary)+( Lambda MPF, secondary).

    There will be an update to Midas RC which will include in the safety report a separate column showing the diagnostic logic failure rate in each component, e.g. CPU1CORE, so the customer can clearly see the FIT rate of the diagnostic logic.