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TMS570LS3137: Safety activities to comply with required SIL

user5157978
Prodigy 30 points
Part Number: TMS570LS3137

 

 

Hi,

We are working on a TMS570LS3137, according to the Safety Manual for TMS570LS31x and TMS570LS21x Hercules, there are some integrator activities that must be done.

 

My question is:

Apart the section 5 of the Safety Manual. Could you tell me another activities that I need to do as integrator that are not mentioned and  are important to comply with  the Safety Certificate of the MCU and to reach the required SIL?

 

For example we are doing this as part our integrator activities checklist:

1)      We are using the FMEDA to determine the safety modules and the needed diagnostics to calculate the FIT and the SFF that we require to reach the SIL according to the HW SIL table for subsystems type B of  IEC 61508.

2)      Apply best practices at all stages of hardware and system to avoid systematic failure and to control random failures

 

Im  looking fordward to hearing from you soon.

 

Best regards,

 

David.

  • 0
    TI__Guru 59540 points
    Hello User,

    There are many areas of compliance needed. Our certification only provides certification at the component level and will only apply if you use in in accordance with the intended use/ provided guidelines to achieve the necessary SFF, PFH, and DC at the component level. However, if you are targeting safety for your application, it can only be achieved through system level compliance. The MCU is only one small part of this. There are many requirements of the standard that include in no specific order design process, verification, validation, requirements definition and documentation, requirements tractability, project definition, safety requirements specification, FTA, system level FMEDA for quantitative analysis, system level FMA for qualitative analysis, and many many more.

    I would strongly suggest that you reach out to a reputable consultant to help you evaluate your process and infrastructure to identify the gaps to the IEC61508 standard and help to close these gaps. Then, in accordance to the standard, generate the necessary work process to support a safety development process including the necessary evidence of compliance that is required for assessment to the standard and eventual certification. Some third party companies that you may want to consider for consultancy are TUV SUD, TUV Rheinland, TUV NORD, TUV SVG, exida, kVA, and KPIT. The last 2 only consult but the prior 5 offer consultant services as well as certification and assessment services. Note that this list is not an endorsement of any of these companies and is only a list to convey service providers that I am specifically aware of that could help you.

    Also note that TI is not able to consult or provide anything other general guidelines in regard to your system level safety considerations as it relates to the use of our components only. Although we offer devices that comply with the safety standards, we are not Functional Safety assessors or consultants and recommend you seek assistance from those that do so on a full time professional basis.
  • 0
    TI__Guru 59540 points
    David,

    I also wanted to point you to some videos we have on our SafeTI site (ti.com/safeti) that includes a 4-part safety training. It isn't all inclusive or a deep dive into it, but it gives a pretty good overview. We also have the slides posted at the top of the E2E site so you can follow along or review later. These will help you understand more about the level of requirements needed for functional safety.

    Here is a link to a page with the 4-part video series on it.
    training.ti.com/functional-safety-4-part-training-series
  • 0 in reply to Chuck Davenport
    Prodigy 30 points
    Hi Chuck,

    thanks for replaying. As you said Safety is a whole complex process that include, for example according to the IEC61508; many activities diveded into phases. In our case, we are in the process to demonstrate to an our external assesor, who is TÜV Rheiland; that in a first stage we comply with the "small components" that have safety certification. In particular, my questions was focused at component level for the TMS570LS3137 and what we must do to to integrate it correctly (without invalidate its certification).So, If i undestrand, our next step is to review the Hercules FMEDA of the LS31 family to determinate how to reach the SFF, DC and the PFH needed just for the MCU.

    If you have any comment or recommendations, please let me know.

    Thanks again for you time and for the tutrorials, i will check all of them.

    David.