cancel
Showing results for 
Search instead for 
Did you mean: 

Power Supply for STM32H757xI in package WLCSP156 - decoupling capacitors

Ronil
Senior

Hello all, for STM32H757xI in package WLCSP156, I didn't find a clear explanation about connecting capacitors for power supply. 

According to the schematic from STM32H757xI  kit, it looks like all VDD_MCU pins need to connect 100 nf capacitors, 

kit.jpg

Only in my case, I can do that, since not enough place on the PCB

Power Supply_1.jpg

I wanted to ask, does it have any opportunity to connect VDD_MCU pins to each other and connect to more powerful capacitors. If yes, how can I calculate nominal for capacitors in this case 

I want to do like here

Power Supply _2.jpg



1 ACCEPTED SOLUTION

Accepted Solutions

@Ronil wrote:

Hello all, for STM32H757xI in package WLCSP156, I didn't find a clear explanation about connecting capacitors for power supply. 

According to the schematic from STM32H757xI  kit, it looks like all VDD_MCU pins need to connect 100 nf capacitors


Did you see Application Note AN4938Getting started with STM32H74xI/G and STM32H75xI/G MCU hardware development ?

via: https://www.st.com/en/microcontrollers-microprocessors/stm32h757xi.html#documentation

AndrewNeil_0-1744111757933.png

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

View solution in original post

2 REPLIES 2

@Ronil wrote:

Hello all, for STM32H757xI in package WLCSP156, I didn't find a clear explanation about connecting capacitors for power supply. 

According to the schematic from STM32H757xI  kit, it looks like all VDD_MCU pins need to connect 100 nf capacitors


Did you see Application Note AN4938Getting started with STM32H74xI/G and STM32H75xI/G MCU hardware development ?

via: https://www.st.com/en/microcontrollers-microprocessors/stm32h757xi.html#documentation

AndrewNeil_0-1744111757933.png

 

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

Thank you so much