stm32h755 power review

baselimadt · ‎2024-11-13

Hi,

I am designing a board based on STM32h755zit6 MCU and it's the first time for me working on this MCU, I am trying to simplify the design as possible to avoid any problem in the development, since we are short in time.
I found out that there is a firmware configuration for the power, is there a default configuration so I can make the hardware based on it? right now I made this schematic based on the Nucleo board, but I want to make sure that it's right configuration, Also I have the ST-link 2 is it possible to use it for programming?

thanks

Basel

SofLit · ‎2024-11-13

Hello @baselimadt and welcome to the community,

Better to remove the grid from the background in your schematics for more visibility.

Thanks.

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liaifat85 · ‎2024-11-13

Shouldn't there be a pull-up resistor (typically 10 kΩ) connected to the NRST pin?

SofLit · ‎2024-11-13

No need for external pull-up resistor on NRST pin. There is one internal:

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Andrew Neil · ‎2024-11-13

@liaifat85 wrote:
Shouldn't there be a pull-up resistor (typically 10 kΩ) connected to the NRST pin?

No - As @SofLit said, there's one internally.

See Application note AN4938, Getting started with STM32H74xI/G and STM32H75xI/G MCU hardware development:

https://www.st.com/resource/en/application_note/an4938-getting-started-with-stm32h74xig-and-stm32h75xig-mcu-hardware-development-stmicroelectronics.pdf#page=17

@baselimadt - study that app note.

baselimadt · ‎2024-11-13

here is a picture without it

Andrew Neil · ‎2024-11-13

Did you check against Chapter 2 of AN4938?

It's all about power supplies:

https://www.st.com/resource/en/application_note/an4938-getting-started-with-stm32h74xig-and-stm32h75xig-mcu-hardware-development-stmicroelectronics.pdf#page=7

baselimadt · ‎2024-11-13

I did read it in a hurry, but I found that people still facing problem with it here in the community, so I decided to make a quick review with you, to make everything is good.
since we don't have time for redesign if there were a problem

SofLit · ‎2024-11-13

To me, C74: you have 150pF but in the Nucleo-H755 is 220pF so I suggest to use that value.

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