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smy.1
smy.1
Associate
Jun 12, 2023 1:50 AM UTC
Question

Please inquire about the meaning of device marking.


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When it is 93, it works normally, but when it is VC, it does not enter uart boot mode.

What's the difference?

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    7 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    Jun 12, 2023 2:17 AM UTC

    It's where the wafer's were diffused, so maskset also.

    Do you pull BOOT0 LOW in your design?

    93 TSMC Taiwan Fab 3

    Not familiar with VC, perhaps Crolles or one of the French plants, PCN not helpful

    https://community.st.com/s/question/0D53W00000e2tEoSAI/does-anyone-have-a-cheat-sheet-to-tell-me-what-the-date-code-is-and-what-it-stands-for

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    mchoi.2
    mchoi.2
    Visitor II
    Jun 12, 2023 2:45 AM UTC

    yes i pull BOOT0 LOW in my design.

    Tesla DeLorean
    Tesla DeLorean
    Guru
    Jun 12, 2023 2:18 AM UTC

    Dupe https://community.st.com/s/question/0D53W00002IdlGFSAZ/stm32f107rct6-%EB%B6%80%ED%8A%B8%EB%A1%9C%EB%8D%94-%EB%8F%99%EC%9E%91-%EA%B4%80%EB%A0%A8-%EB%AC%B8%EC%9D%98

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    Tesla DeLorean
    Tesla DeLorean
    Guru
    Jun 12, 2023 4:27 PM UTC

    @Billy OWEN​ @Peter BENSCH​ @Heather ROBERTSON​ 

    Could someone confirm if this is ST product? I don't find any reference to the VC fab code, or any related PCN. Can't say I've done a exhaustive search, but enough that something should have shaken loose.

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    Billy OWEN
    Billy OWEN
    ST Employee
    Jun 12, 2023 4:38 PM UTC

    Hi @Community member​ 

    You know the drill, management needs items like this to be tracked and logged in our Support system to be looked into any deeper, for a variety of reasons.

    Hi @shin my​ 

    Please kindly take just a moment to open a support case directly at your myST profile: my.st.com/ols

    Thanks,

    Billy

    Tesla DeLorean
    Tesla DeLorean
    Guru
    Jun 12, 2023 4:53 PM UTC

    I should should be able to find PCN without mining the internet and filing online-support requests.

    Some of this material should be on ST's site, not things I have to dredge off Mouser and DigiKey, and other distributors.

    I understand tracing needs more specific detail, but in broad terms I think Fab/Diffusion location, and package / test sites should be simple enough to explain / decode, especially in an environment where source country needs to be quickly / definitively established.

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    waclawek.jan
    waclawek.jan
    Super User
    Jun 12, 2023 4:46 PM UTC

    >> it does not enter uart boot mode.

    > yes i pull BOOT0 LOW in my design.

    Shouldn't you be pulling BOOT0 *high* to enter bootloader?

    And, also, BOOT1 low.

    JW

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