STM32F446 Power Supply Configuration and passive component s

[BÇetk.1]

Hi. Currently I am trying to learn both STM32's and electronic circuits. Currently I am designing a STM32F446 LQFP64 flight computer. And I couldn't make sure that I connected the power supply correctly. And I don't know which passive components I should use other than capacitors. This is the current schematic I made. Is it correct and what should I add ?

[RBENF.1]

Hello​,

At first glance, I would say there's an issue with the way you connected your VDD decoupling capacitors. They should be connected between your 3.3V supply and ground. VDD pins should be connected to your 3.3V.

Since it doesn't seem you are going to use an external battery, consider VBAT as another VDD pin and connect it to 3.3V (and thus add another 100nF cap).

Also, a resistor is typically used to connect VDDA and VREF+, but on your specific package VREF+ and VDDA are already connected so you should remove it.

Finally, add a bulk 1uF decoupling capacitor along with the others.

 

Regards,

Ryan