1.4 KiB


this is a complete re- board layout. it does not fit an off-the selves enclosure anymore. all SMD parts are on one side to allow easier SMT assembly.


  • 6-40V power input activated when UFP is connected
  • use current limit on DFP (prevents USB to reset when DFP is shorted)
  • 6-40V power input capacitor now lays down
  • remove copper plane under crystal to prevent impedance error


  • crystal still does not start
  • none of the two possible OCS inputs (Dx04 XOR Dx05) work
  • power dip causes reset when enabling all 7 DFP power outputs at once


this version has been designed to fit in a 100x60x25mm enclosure. this makes it very compact, and not all surface mount parts fit on one side. this is not too much of an issue since it's a hand soldered prototype.

the prototype mostly works, with a couple of small errors:

  • 6-40V power input is not activated unless the hub is already powered (through USB or 5V input)
  • crystal oscillator doesn't always start. I think the underlying copper plane skewed the impedance/capacitance too much
  • USB-A footprint has inverted pinout: just solder it on the other side and don't swap the data pins in the EEPROM configuration
  • fuse on downstream port is not fast enough to prevent shorts and causes the hub to reset
  • 6-40V power input capacitor is too tall and does not fit in the case
  • one of the LEDS on port 3 is misplaced