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TMP75-Q1: soft error rate for configuration registers

Tilmann Ochs
Prodigy 20 points
Part Number: TMP75-Q1
Other Parts Discussed in Thread: TMP75

Hi, we are using a couple of TI temperature sensors, e.g. TMP75AQDGKRQ1, for a safety critical design. I currently investigate how far soft errors in the configuration registers of such devices occur with significant rate or can safely be neglected. Any information appreciated.

  • 0
    TI__Genius 9675 points

    Hi Tilmann,

    Would you mind clarifying what is meant by soft errors? Could this be information about having registers boot up with the correct values upon reset/power up? Or maybe registers failing to write the correct value after a communication?

    If you could provide more details on what you are looking for as far as soft errors I can help further.

    Jalen

  • 0
    Prodigy 20 points
    Hi Jalen,

    thank you for your response!

    My concern is that the state of the configuration registers may be corrupted during continuous operation by the influence of cosmic radiation.

    This could cause the TMP75 to not to detect under/over voltage conditions and assert the interrupt signal properly.

    Cosmic radiation may cause single event upset (SEU) of register bits.

    SEU is a known effect for low-voltage highly integrated devices, so it might not be a relevant for the TMP75.

    TI might have measurement data for soft error rates or provide the information that SEU is negligible. If both does not apply, the CMOS technology used in this device might help to judge the susceptibility for soft errors.

    Any information very appreciated!

    Tilmann Ochs

  • 0 in reply to Tilmann Ochs
    TI__Genius 9675 points

    Tilmann,

    After talking internally there are a few options here. We do have TI parts that have gone through radiation testing. These parts are specifically made and tested to within stand radiation such as the cosmic radiation you are referring to. At the moment, the only temperature sensor that is has gone through this testing is our remote temperature sensor TMP461-SP. Here is a Single-Event Effects test report for more details on the study.

    For automotive applications, we don't normally see cosmic radiation messing up cars. However, if cosmic radiation does hit a device, it could fail. In this case, I'd suggest using two different devices so that they don't fail in the same way. One recommendation for another auto qualified digital temperature is the TMP112-Q1. This redundancy is a common safety approach we have seen customers implement. A full list of other Functional Safety Capable temperature sensors can be found here.

    Jalen