Opensource USB HUB

I made a custom USB HUB and now free to everyone to download

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I was looking to make a custom USB Hub for a project but I couldnt find any of them that worked and using the chip GL850G. The chip is pretty old and cheap, but in my case I didnt need to use any of the fast transfering USB3, probably the next version can be based on this schematic.

I have took the schematic from a chinese website and re-written on eagle + designed the PCB, which is not the best compact and neat design but it worked as prototype.

I am offering all the files and part lists in case someone will want to make a custom USB Hub.

Enjoy this project?



K.C. Lee wrote 05/16/2017 at 13:13 point

You have discontinuity i.e. power/ground plane splits under your differential USB  tracks.  Might want to route those 4 vertical tracks else where.

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Paul Stoffregen wrote 10/19/2016 at 10:18 point

Any thoughts about a Multi-TT version?  Using this Single-TT chip is cheaper, but it means poor performance if more than one 12 Mbit/sec or 1.5 Mbit/sec devices attempt to communicate simultaneously.

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Christian wrote 05/16/2017 at 13:00 point

I am not sure, I took one of the schematic on the internet and tried to reproduce on eagle + pcb.

I found out this chip was too complicated and I made another one. Check out my github

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Lacho Tomov wrote 09/25/2016 at 19:22 point

Hi, does the differential impedance matter in this case? 

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Christian wrote 05/16/2017 at 13:00 point

You need to be careful about the traces, they need to be same length. probably mine is not to top standard but working as usb 2.0

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