Hello and thank you very much for your help. Your drawing is very good. If I may suggest to you, instead of tracks at the bottom side, use zeros at the top, for example R1206 or even R0603, so you can route underneath them and avoid vias. I can't tell from the image if you already did this, it's just a suggestion.
This is my sixth four-layer design with MCUs, the second with RP2040, others were with W5500, STM32, AVR4809, LAN9252 (Ethercat ASIC). All with crystals below 25 MHz. Some crystals in PTH that have a lower CL value, others in SMD. They all worked very well.
This is the first time I've had this headache. Nothing serious actually. Just remove the capacitors and the project works. For example, see the prototype and final PCB below.
There is nothing that of an extravagant difference. I'm a software engineer and although I have a good background as an electronics technician, I always seek information from professionals, for example, Zack Peterson from Altium Academy and Robert Feranec from Fedevel Academy. They always interview industry professionals who give excellent PCB building tips. I followed many of their tips and researched several other sources. Like here https://electronics.stackexchange.com/q ... ystal-have here https://www.researchgate.net/post/What- ... ystal-have and here https://copyprogramming.com/howto/shoul ... e-the-same
All they say in commom is that it may work, it may not. Go to the formulas, calculate, test, adjust.
As they say "it´s analogue, it´s black magic"
Marco
This is my sixth four-layer design with MCUs, the second with RP2040, others were with W5500, STM32, AVR4809, LAN9252 (Ethercat ASIC). All with crystals below 25 MHz. Some crystals in PTH that have a lower CL value, others in SMD. They all worked very well.
This is the first time I've had this headache. Nothing serious actually. Just remove the capacitors and the project works. For example, see the prototype and final PCB below.
There is nothing that of an extravagant difference. I'm a software engineer and although I have a good background as an electronics technician, I always seek information from professionals, for example, Zack Peterson from Altium Academy and Robert Feranec from Fedevel Academy. They always interview industry professionals who give excellent PCB building tips. I followed many of their tips and researched several other sources. Like here https://electronics.stackexchange.com/q ... ystal-have here https://www.researchgate.net/post/What- ... ystal-have and here https://copyprogramming.com/howto/shoul ... e-the-same
All they say in commom is that it may work, it may not. Go to the formulas, calculate, test, adjust.
As they say "it´s analogue, it´s black magic"
Marco
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Statistics: Posted by marcoadeoli — Wed Feb 07, 2024 11:28 am
