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Welcome_123
Associate
October 18, 2024
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External oscillator input

  • October 18, 2024
  • 17 replies
  • 6028 views

In application we are using MCU part no STM32G0KCIU6 of LQFP32 / UFQFPN32 - GP package, can external oscillator of frequency 16MHz (Example: Part no ASEMB-16.000MHZ-LY-T) can be connected to pin no 2 which is dedicated for LSE clock frequency 32KHz. As per datasheet Pin assignment and description list Pin No 2 of MCU has additional options to configure as OSC_IN whether this pin can be configured for HSE requirement? Can external oscillator of frequency 16MHz can be connected to this Pin?

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Best answer by mƎALLEm

With Crystal oscillator you need to use only OSC_IN  and in this package only OSC_IN is available:

SofLit_0-1729249349878.png

So you need to use a Crystal oscillator not a Crystal/resonator.

Example: https://sourcewell.in/product/crystal-oscillators/

Hope it does answer your question.

 

17 replies

mƎALLEm
mƎALLEm
ST Technical Moderator
October 18, 2024

Hello @Welcome_123 ,

There is no STM32G0KCIU6 device in ST portfolio, could you please provide the correct part number?

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    Welcome_123Author
    Associate
    October 18, 2024

    MCU Part no STM32G0C1KCU6

    Andrew Neil
    Andrew Neil
    Super User
    October 18, 2024
    @Welcome_123 wrote:

    MCU Part no STM32G0C1KCU6

    Then this is the datasheet:

    AndrewNeil_0-1729244998546.png

    https://www.st.com/resource/en/datasheet/stm32g0c1kc.pdf#page=83

    For 16MHz, you'd need to use OSC_IN - not OSC32_IN: see correction below 

    AndrewNeil_1-1729245102158.png

     

    EDIT - correction:

    Ah - Now I see that pin 2, PC14, can be either OSC_IN or OSC32_in - so that should be OK?

     

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Andrew Neil
    Andrew Neil
    Super User
    October 18, 2024
    @Welcome_123 wrote:

    MCU part no STM32G0KCIU6 

    That doesn't seem to be a valid part number?

    Looking at the STM32G0B1xB/xC/xE datasheet, the OSC32_IN specs are:

    AndrewNeil_0-1729244405346.png

    https://www.st.com/resource/en/datasheet/stm32g0b1kc.pdf#page=82

     

    @Welcome_123 wrote:

     Pin No 2 of MCU has additional options to configure as OSC_IN whether this pin can be configured for HSE requirement? Can external oscillator of frequency 16MHz can be connected to this Pin?

    You mean OSC32_IN ?

    Check the datasheet for the part you're actually using, but it looks like a NO.

    Why not use the OSC_IN pin - which is specified for high-speed use:

    AndrewNeil_1-1729244645907.png

     

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    STTwo-32
    STTwo-32
    ST Technical Moderator
    October 18, 2024

    I think you are toking about the STM32G0C1KCU6 or STM32G0B1KCU6, for both MCUs, the Pin 2 (PC14-OSC32_IN) can be used as OSC32_IN, OSC_IN so, you should be able to use a 16MHz oscillator on this pin.

    STTwo32_0-1729244801244.png

    STTwo32_0-1729245836745.png

     

    Best Regards.

    STTwo-32

     

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      Andrew Neil
      Andrew Neil
      Super User
      October 18, 2024
      @STTwo-32 wrote:

       Pin 2 (PC14-OSC32_IN) can be used as OSC32_IN, OSC_IN

      So it does!

      But that makes Table 14 (which I cited earlier) a bit misleading: the limitation isn't on the pin (as the table suggests) - it's on whichever oscillator path its feeding...

      A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
      Welcome_123Author
      Associate
      October 18, 2024

      yes need a crystal oscillator powered with 3.3V

        Andrew Neil
        Andrew Neil
        Super User
        October 18, 2024

        You suggested one in your opening post?

        A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
        mƎALLEm
        mƎALLEm
        ST Technical Moderator
        October 18, 2024

        According to its datasheet: 

        SofLit_0-1729255548560.png

         

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