FAQs
cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 

Shorted between VDD and VSS, what are causes? How can it produce?

Whanni
Associate

‎2019-04-23 08:06 AM

Currently, I design a board with STM32f413 to Motor control. Sometimes, when I turn on the power supply , I have a shorted occurs betwwen VDD (+3.3V) and VSS. So I had to change my CPU to my board. In my board, I have a different power supply betwen my VDD and VDDA.

0690X000008AoaWQAS.png

Do you think a separated power supply can produce a shorted if the VDD and VDDA are not provide at teh same time? Or if there are drop between it?

Thank you,

Best regards,

Wh

Labels:
0 Kudos
1 REPLY 1
Uwe Bonnes
Principal III

‎2019-04-23 09:25 AM

I managed to get "hot" STM32 by injecting to much current into some input. I read the datasheet 6.1.7. that as long as every voltage is below 4.0 volt, either VDD or VDDA can be omitted with no harm. Check your layout for: Spikes in VDD(A) when switching, unconnected VDD(A) pins, or pins unintentional connected to voltage > 4 Volt.

0 Kudos
Top