Usage of decoupling capacitor in STM32H503KBU6

[bhavan_kumar]

Hi, 

     I am currently using STM32H503KBU6 MCU (32 pins). For my project the space in PCB board is critical. I have placed a LDO, Level translator, voltage supervisor and along with their associated passives in a 10mmx16mm PCB board. Now I still need to place three resistor, which I can't able to place because there is no space. My question is that is it necessary to use a high value decoupling capacitor (4.7uF) for VDD and VDDA? Because if I remove those two 4.7uF capacitor, I will get some space to place the three resistors. Kindly give me your thoughts about this. I have attached schematic images which is available in STM website.

 

 

 

Thanks,

Bhavan 

[Andrew Neil]

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@bhavan_kumar wrote:

I need to place three 0 ohms resistor for SWD debug interface

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Why does that need zero-ohm resistors?

:thinking_face:

[bhavan_kumar]

In order to do a SWD debug interface we need to connect the respective pin (PA13, PA14, NRST) to a 0 ohm resistor

[Andrew Neil]

But why zero-ohm resistors?

Why not just connect direct to your debug header/testpoints/whatever - especially as you're short of space?!