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hvs_learn
Explorer II
January 17, 2025
Question

STM32H7 base schematic review

  • January 17, 2025
  • 1 reply
  • 1108 views

I have attached herewith the first iteration of the schematic for my custom stm32 board utilizing the H753ZIT6 MCU.
I would like to clear few doubts regarding 
1) In the nucleo schematic for the same, STM has used F7 MCU for their ST Link interface, should I do the same? or rely on SWD/JTAG for boot and programming.
2) I am evaluating between choosing either JTAG or SWD for my main means of communicating with the IC, should I make provision for both of these on a single connector?
3) If I am choosing not buy the STLINK V3 or V2, what do I need to take care of, from both a hardware and software point of view?
4) The oscillators chosen are: TSX-3225_24.0000MF20G-AC0 for HSE and CM8V-T1A-32.768k-9pF-20PPM-TB-QA for LSE. Is their respective circuitry correct and in general the chosen oscillators right? I read the AN2867 guide but most of the recommended oscillators were over-budget for my specific project. 

This is my first time ever being involved in hardware design, so if any common mistake is found, please let me know.
Thank You

 

 

 

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    1 reply

    P
    Pavel A.
    Super User
    January 17, 2025

    > 1) In the nucleo schematic for the same, STM has used F7 MCU for their ST Link interface, should I do the same?

    If you want to have a ST-LINK available for your product, provide a connector for external ST-LINK (or other adapter such as J-Link), or mount a suitable ST-LINK v3 onto your board. You cannot just use a normal STM32F7 because the firmware for ST-LINK is not available to you. For the external clock (HSE) - better use a normal crystal or oscillator. 

    2) depends on your requirements. If no requirement - do what is easier (SWD).

    > 3) If I am choosing not buy the STLINK V3 or V2, what do I need to take care of,

    Just provide a connector for external adapter (maybe with some UART routed to the debugger VCP).

    > most of the recommended oscillators were over-budget for my specific project. 

    Then correct the budget, before it's too late? By the way. under-estimating the cost is a common beginner mistake )) Always have a safe margin.

     

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