2020-12-03 12:17 PM
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.
Solved! Go to Solution.
2020-12-03 12:36 PM
This is a better document which describes the required hardware layout:
That answers most if not all of your questions. If you have questions after reading that, feel free to ask.
2020-12-03 12:36 PM
This is a better document which describes the required hardware layout:
That answers most if not all of your questions. If you have questions after reading that, feel free to ask.
2020-12-03 12:43 PM
Awesome! It even has crystal connection schematics. I never would have found that document by myself.
Thanks a bunch.
2020-12-03 01:37 PM
For oscillators there is also AN2867.