10/22/2025 6:21 PM - finding usb mux ic

What I Did

i researched different manufacturers like infineon for their chips.
Next Steps

time to pick all of the parts for the ic to work :D
Issues Faced

the chips i found are usually ball pads and there are so much stuff to route lol. i found a good contender with qfn package for 4 port with integrated usb cc negotiations too :D

10/22/2025 6:22 PM - going with the GENESYS GL3523

What I Did

after some more researching, this part can mux 1 usb port into 4, pretty nice and it doesnt have any pads under the package, which is extra nice
Next Steps

time to make the schematic!

10/22/2025 6:22 PM - switching ic to ch334f

What I Did

nvm im gonna downgrade to usb 2.0 speed, but this chip is so much easier to work with
Next Steps

find other components like usb port protection

10/22/2025 6:23 PM - first 3 usb port is done

What I Did

did the schematic for the first 3 ports, pmic added and usb connectors added, its great
Next Steps

finish the rest of the ports
Issues Faced

some better ics were not available on lcsc :C

10/22/2025 6:24 PM - routed all of the necessity for ethernet

What I Did

did all of the stuff related to usb ethernet
Next Steps

last is audio schematic
Issues Faced

im so tired, next is routing all of the audio stuff

10/22/2025 6:25 PM - all done schematic!!!!

What I Did

schematic is all done, just finished the audio part. pcb layout should be straightforward and easy

Next Steps

pcb layout and fix ethernet wiring

10/22/2025 6:25 PM - half way done for pcb routing

What I Did

did so much routing, was so sick so i couldnt finish it earlier lol
Next Steps

finish the rest of pcb layout
Issues Faced

sick :heavysob: :heavysob:

10/23/2025 - routed decoupling capacitors

did some more pcb routing, decoupling caps some are routed, some still need to be routed.

doubting myself huge times on the ethernet wiring so fixing that

10/25/2025 12 AM - routed ethernet and other misc

routed so much more stuff today, had to use the correct footprint for the rj45 jack so did a lot of fixing, and fixed the wiring for ethernet and the transformer and stuff

10/25/2025 10 AM - all components on board yay!

very likely i will finish this today, only a bunch of testpoints left to route and silkscreen text and art to do, but im close there yayyyyyyyyyyyyyyyy

10/25/2025 3 PM - routing done, art done

pcb routing is finally done, added art

ready to ship, letssssssssssssssssssssssssssssssssssssssssssss goooooooooooooooooooooooooooooooooooooooooooooooo

10/25/2025 6 PM - sunked some more time fixing diff pairs

sunked some more time fixing diff pairs

the other stack up has special, so no pcba, but i need pcba

chose a different one, recalculated stuff and rerouted the pairs