cancel
Showing results for 
Search instead for 
Did you mean: 

Power supply scheme for STM32H750

Slina
Associate III

I'm working on PCB with two MCUs, and I'm not sure how to connect power supply lines. Even after reading the datasheet and RM0433, I still find it confusing. Like, which one of the VDD33USB or VDD50USB should I connect and why? Do I connect both? Or do I need to connect VDDLDO? Or VBAT, if I don't plan to use battery and what to do with that pin in that case? Or do I need to connect any of USB VDDs if I'm not using USB or I can keep it floating? Or can I connect the same power supply on all 3.3V power lines? Or can I keep floating analog power input, and use on-chip one?

Is there a nice document to explain it all in details? I was working with SILab MCUs before and the document simply had all scenarios, saving me the trouble of experimenting.

1 ACCEPTED SOLUTION

Accepted Solutions
TDK
Guru

This is a better document which describes the required hardware layout:

https://www.st.com/resource/en/application_note/dm00337873-getting-started-with-stm32h74xig-and-stm32h75xig-hardware-development-stmicroelectronics.pdf

That answers most if not all of your questions. If you have questions after reading that, feel free to ask.

If you feel a post has answered your question, please click "Accept as Solution".

View solution in original post

3 REPLIES 3
TDK
Guru

This is a better document which describes the required hardware layout:

https://www.st.com/resource/en/application_note/dm00337873-getting-started-with-stm32h74xig-and-stm32h75xig-hardware-development-stmicroelectronics.pdf

That answers most if not all of your questions. If you have questions after reading that, feel free to ask.

If you feel a post has answered your question, please click "Accept as Solution".
Slina
Associate III

Awesome! It even has crystal connection schematics. I never would have found that document by myself.

Thanks a bunch.

For oscillators there is also AN2867.