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I want to make sure that power circuit is okay
Hello @undefined2001 nice one. How did you get the values for the input and output capacitor of the ams1117 voltage regulator?
googling
Alright check the datasheet
AMS1117.pdf
what about others?
The STM32 you are using, the datasheet has some recommendations for capacitors on the power line, have you checked it out?
If possible you can drop the datasheet here
https://www.st.com/resource/en/application_note/an4555-getting-started-with-stm32l4-series-and-stm32l4-series-hardware-development-stmicroelectronics.pdf
Alright cool
You used what the manufacturer recommended
i tried
You are good to go
whaat about VDDA?
Yeah that’s fine
good to hear
want to replicate it
but with a stm32
@afuevu_
I updated it
Here are my 2 cents.
I don’t see the programming SWD pins.
I’d also recommend to put the decoupling caps near the pins. It will help in layout.
Also good idea to add caps on switches for de-bouncing.
it’s not complete yet so programming pins are missing.
thanks for the suggestions can you please help me a bit more with the decoupling caps value and how you determine that?
also the mcu I am using has combined VDDA/VREF pin
how should I handle that?
For most applications, use the standard values, 0.1uF for removing high frequency noise and 1-10uF for voltage dips and low frequency noise.
For the VDDA pins, I’ll refer the datasheet.
I’d be honest I’ve not used ADC in my projects in a long time.
I think you can add some decoupling caps on the VDDA pins, there is an internal regulator that provides a stable voltage to the ADC section.
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