nevetsokyeron
Member
I've got a 3.6 USB host project going and I'd like to integrate a USB hub into my pcb design - thus removing the need for a external hub. In turn, this leads to questions about power.
FWIW - the project is a kind of usb-midi router. Attached devices will be mostly midi controllers and are typically powered from USB
My current (working) pcb design is a shield to break out the 3.6 USB host to a USB-A connector and then provide some other headers. Power comes from the Teensy's micro-usb. I can connect an external powered USB hub to the USB Host and it all works great. So... what if I could integrate a hub into the shield pcb? (I found a github Hub project based on the TUSB2046 usb chip)
Thus I'd have 3.6 USB Host -> internal hub -> 4 USB connectors
Thus - my question is about how to handle power to the teensy and the hub in various situations:
Would it be possible to switch back and forth between an external power source and the teensy's VIN->VUSB power?
Situation 1: Nothing attached to usb hub ports. In this case it'd be nice not have have a separate power connector and just use the Teensy VIN->VUSB.
Situation 2: Adding USB devices to the hub ports. Here I'll need external power. I assume I'd just power everything (teensy/hub) from an external 5V supply.
Any gotchas I should be aware of when laying out this pcb?
Thanks!
FWIW - the project is a kind of usb-midi router. Attached devices will be mostly midi controllers and are typically powered from USB
My current (working) pcb design is a shield to break out the 3.6 USB host to a USB-A connector and then provide some other headers. Power comes from the Teensy's micro-usb. I can connect an external powered USB hub to the USB Host and it all works great. So... what if I could integrate a hub into the shield pcb? (I found a github Hub project based on the TUSB2046 usb chip)
Thus I'd have 3.6 USB Host -> internal hub -> 4 USB connectors
Thus - my question is about how to handle power to the teensy and the hub in various situations:
Would it be possible to switch back and forth between an external power source and the teensy's VIN->VUSB power?
Situation 1: Nothing attached to usb hub ports. In this case it'd be nice not have have a separate power connector and just use the Teensy VIN->VUSB.
Situation 2: Adding USB devices to the hub ports. Here I'll need external power. I assume I'd just power everything (teensy/hub) from an external 5V supply.
Any gotchas I should be aware of when laying out this pcb?
Thanks!
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