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sammissh
Associate
February 15, 2024
Question

STLINK-V3MODS Edge Connector Pin 30

  • February 15, 2024
  • 3 replies
  • 2034 views

Hi, there

I'm trying to integrate the STLINK-V3MODS with my STM32H745 based project.

The STM32H745 MCU is powered by an external 3V3 output regulator.

The STLINK-V3MODS board has the following edge pin:

sammissh_0-1708020019590.png

Which is described in the manual as an "Input for STLINK-V3MODS". Now, I'd like to know if I should tie this pin to my 3V3 board voltage, for the MODS to function correctly. Or, if I can just leave this pin floating.

The only functionality I need from the MODS board is to 1. Debug the H745 MCU; 2. Carry serial data via the UART line.
I know that the MODS board powers via USB, hence why I'm a bit confused about this pin 30.

Thank You!

This topic has been closed for replies.

3 replies

Tesla DeLorean
Tesla DeLorean
Guru
February 15, 2024

The T_VCC or Target Voltage, isn't to power the MODS board, or the Target, it would be there to power interface buffers to the Target at the correct voltage, in cases presumably where it's not 3.3V.

That the MODS is USB powered is irrelevant.

Check what STM32 Cube Programmer reports as the Target Voltage, it should match what the Target is running at, as provided via T_VCC

 

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    Tesla DeLorean
    Tesla DeLorean
    Guru
    February 15, 2024

    Please read the documentation, makes life a lot simpler.

    https://www.st.com/resource/en/user_manual/um2502-stlinkv3mods-and-stlinkv3mini-debuggerprogrammer-tiny-probes-for-stm32-microcontrollers-stmicroelectronics.pdf

    mods_t_vcc.jpg

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    TDK
    TDK
    February 15, 2024

    It should be tied to VCC on your target STM32 chip. You can leave it floating and still program, but then the programmer won't be able to detect the target voltage, which is a useful feature.

    This is what allows the "Target voltage: X" in STM32CubeProgrammer.

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      S
      sammisshAuthor
      Associate
      February 23, 2024

      Thanks for the help, all. 

      I did read that portion of the documentation, but still wasn't entirely sure I understood it 100%.

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