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TIDA-01599: SIL grade

Nam, Dino
Expert 5965 points
Part Number: TIDA-01599
Other Parts Discussed in Thread: TIDA-00195, UCC21750, LAUNCHXL-F28027

Tool/software:

Hello team, 

We can see "The STO reference design (1oo2) has been assessed by the TUEV SUED to be generally suitable for SIL 3 and PL e | Cat. 3"  and "The MCU (SIL 1) and the software are not part of this design." at user guide.

Q1, Is this grade(SIL 3) for full system including MCU(SIL1) with the software implemented accordingly to meet at least SIL 1? or only for TIDA-01599 without MCU? 

Q2, If SIL 3 grade is for only TIDA-01599 without MCU, Is it possible to get SIL 3 grade for full system, TIDA-01599 and 1ea MCU(SIL1) with software?

Q3, If we can't get SIL 3 grade for full system with TIDA-01599 and 1ea MCU(SIL1), How can we get SIL 3 grade? is it possible to get SIL3 grade adding 2ea MCU(SIL1)? 

Please review it and let me know your opinion. 

Thank you.  

  • 0
    TI__Expert 3390 points

    Hello,

    thank you for your question on the TIDA-01599. Please see below my answers to your questions.

    Yes, to achieve SIL3 we need to run diagnostics for the load switches. In the TIDA-01599 hardware we assume this diagnostics (test signal generation, read back feedback signal) runs on an MCU. As the MCU runs the diagnostics for safety, it needs to meet at least SIL 1 itself.
    You can find more details here: Overview STO Concept TIDA-01599, chapter 4.4.5 MCU (SIL 1) Diagnostic Coverage

    Does this answer your question? 

    Thanks. 

    Regards,
    Martin


      

  • 0 in reply to Martin Staebler
    TI__Expert 5965 points

    Hello Martin, 

    Thank you for your comment. 

    For clarify, 

    To achieve SIL3, Do we need 1ea MCU (SIL 1) or 2ea MCU(SIL 1) block? 

    Thank you. 

  • +1 in reply to Nam, Dino
    TI__Expert 3390 points

    Hi Dino,

    a single MCU (SIL1) was used in the TIDA-01599 TUEV concept for the diagnostics to achieve SIL 3. This is also indicated in the system block diagram, where it says in the MCU box: MCU (SIL1) Diagnostics for both channels, please see below. 


    You can find more details here: Overview STO Concept TIDA-01599, chapter 4.4.5 MCU (SIL 1) Diagnostic Coverage.

    Regards,
    Martin

  • 0 in reply to Martin Staebler
    TI__Expert 5965 points

    Hello Martin, 

    More question, 

    Would you please let me know which TI C2000 MCU LaunchPad Development Kit is used in TIDA-01599? 

    Please let me know C2000 part name. 

    And power stage of above Block diagram is TIDA-00195?? Is it right? 

    Thank you.  

  • 0 in reply to Nam, Dino
    TI__Expert 3390 points

    Dino,

    the above block diagram is a copy from the TIDA-01599 design guide. The power stage can TIDA-00995, but is not limited to that. We can use other and newer CMOS gate drivers such as UCC21750 or simple gate drivers like UCC53XX. 

    The TIDA-010599 used the LAUNCHXL-F28027 Development kit, only for testing, no safety software was implemented. The software won be available anymore,

    For the SIL1 MCU, it depends what your customer intents to do in addition to the STO diagnostics. For the simple diagnostics even a MSPM0 might be an option. 

    I'd recommend check with your customers what additional functions in addition to the STO diagnostics they need and then align with C2000 and MSPM) product lines on the most suitable MCU which can achieve SIL1.

    Regards,
    Martin

  • 0 in reply to Martin Staebler
    TI__Expert 5965 points

    Martin, 

    Thank you for your comment. 

    But I can't find TIDA-00995 at Ti.com. Is this design no released? How can I get design file of TIDA-00995? 

    For LAUNCHXL-F28027 Development kit, Is it available to share test software for testing?  

    The customer would like to make proto board same as TIDA-010599 , STO block, C2000 MCU LaunchPad, isolated power and power stage.

    Thank you. 

  • +1 in reply to Nam, Dino
    TI__Expert 3390 points

    Hi Dino,

    Thanks for your feedback. I made a typo, sorry. The correct number is TIDA-00195: https://www.ti.com/tool/TIDA-00195

    Regarding  LAUNCHXL-F28027 Development kit. The MCU and software was not part of the TUEV assessment. Please refer to the TIDA-01599 concept.
    Overview STO Concept TIDA-01599. 

    As mentioned above, we don't have any software to share and their are newer C2000 devices, some of them are even safety certified.

    I'd suggest reach out to the C2000 MCU team to use the latest MCU and get the required support to implement SIL1 and the diagnostics functions. 

    Regards,
    Martin