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https://github.com/undefined2001/stm32h757_PCB/tree/main
I am concern about the 3V3 connection
Here is my feedback
– Not really sure what you are building.
– Good to add KiCAD version this was made with in README.md
– There is no connector for input.
– 1117 can deliver I think upto 1A, you should be good with that as long as its just powering the STM32, The tab is also 3v3.
– The trace on top at pin 2 looks thin compared to the thick trace on the bottom.
– Also too many via, calculate the current through via using Saturn PCB toolkit.
– Add USB, SWD connectors for programming?
– Add power on LED.
– Should add fuse
– Also reverse polarity protection.
– I think the bottom 3V trace should branch out to minimize the voltage drop. See attached pic
Can give more feedback if you give some context on what you are trying to acheive.
Cheers!
I am trying to make a pcb for this mcu boot it and program it
then someone told me that could be troublesome
I was confused about the 3V3 connection. At first i thought I should use sig-gnd-3V3-sig 4 layer stack
I am trying the way he suggested but still confused about the 3V3 connection since there are so many pins to connect
also I didn’t got your last point about 3V3 connection branching out
@hemalchevli This is the final PCB https://github.com/undefined2001/stm32h757_PCB.git but having these errors
So you’re making a development board?
Also if you can please check it a bit for me then I will send it for printing
kinda yes but it is the very basic one only with necessary powering up components
I have bigger plan just want test it
So, I’d suggest to add all the things from your plan, adding footprints is free if there is real esate available. You can leave to footprint unpopluated as you just want to test the controller part.
I think you may need to add PWR_FLAG on the 3V3 net to remore the violation
if I use PWR_FLAG I have to
remove the 5V symbol
PWRGND and GND is same?
I will do it later since I also need to read a lot of datasheet. for example, on board Ethernet port
I’ll take a look when I’m on my machine
thanks
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