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raptorhal2
raptorhal2
Lead
July 2, 2014
Question

STM42F4 Pin 1 Identifier

  • July 2, 2014
  • 7 replies
  • 4686 views
Posted on July 02, 2014 at 02:49

Just received some STM32F405RGT6 (64 pin LQFP) processors with two round circles on opposite corners of the package, one smaller with a concave bottom, the other larger with a flat bottom. The package description in the datasheet of course shows only one mark. Can anyone tell me which is the real Pin 1 identifier ? I suspect it is the smaller circle, but I don't want to risk letting all the smoke out of the chip finding out.

The F405 144 pin LQFP processors also just received correctly have only one pin marker.

Thanks, Hal

 
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    7 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    July 2, 2014

    Posted on July 02, 2014 at 02:52

    https://community.st.com/t5/stm32-mcu-products/stm32f401-64pin-pin1-marking-orientation/m-p/419306

    https://community.st.com/0D50X00009Xka68SAB now dead

    Edit: Fixed DEAD LINK, original post from 1-July-2014, fixed again

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    RobNC
    Visitor II
    August 17, 2023

    Link above is bad.
    Solved: Ambiguity in pin-1 position on stm32f756vgt6 - STMicroelectronics Community
    Seems Pin 1 is lower left when the ST text is properly oriented for reading

      raptorhal2
      raptorhal2Author
      Lead
      July 2, 2014
      Posted on July 02, 2014 at 03:32

      Thanks, Clive1. Hal

      Tesla DeLorean
      Tesla DeLorean
      Guru
      August 17, 2023

      Yes, every time they migrate the forum content gets lost or destroyed. I'll flag this.

      @Amelie ACKERMANN can you get this checked/fixed. Thread would likely have been one showing multiple pin count packages with molding and orientation markings identified.

      Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
      Amelie ACKERMANN
      Amelie ACKERMANN
      ST Community Manager
      August 18, 2023

      Hello @Tesla DeLorean,

      is this the correct thread? STM32F401 64pin pin1 marking / orientation - STMicroelectronics Community
      If so, it is now moved to the "STM32 MCU products" forum board. If not, let me know and I can check further. 

      Thanks,
      Amelie

        Andrei Chichak
        Andrei Chichak
        Lead
        August 24, 2023

        Also, note that the orientation indicated in CubeMX and CubeIDE is wrong with respect to the lettering on the processor.

        I reported this a while back, but what can you do?

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