I have USB1 running as a host, which is its default configuration. (running a USB2 to Ethernet interface.) Since I am powering the board with external +5V going into VIN, I am also using VIN to power the Vbus pin on USB1. In a proper design, there would be a current limiting switch between +5V and Vbus, under the control of P2-3 USB1 Enable. P2-5 (USB1-Vbus) needs to be hooked to Vbus, so the Sitara knows when the USB bus is powered.
--- Graham == On Friday, November 10, 2017 at 1:33:41 PM UTC-6, [email protected] wrote: > > Graham -- > > That totally makes sense. Thanks for the info! I plan to power the board > from an external 5V source so that I can also use one or both USB ports in > host mode. It appears as though SYS VIN (P1 pin 01) won't do the trick. I > guess I will have to power the board through VIN USB1 (P1 pin 07) while > also hooking up a USB breakout board there, somehow. Does that seem like it > might work? > > -- Will > > > On Friday, November 10, 2017 at 9:46:00 AM UTC-7, Graham wrote: >> >> You will probably have to come up with a separate 5V power source for the >> USB Host port. >> >> The Pocket Beagle has three power inputs that will power the CPU: Vin, >> USB-VIN and the battery input. >> None of these back power the other inputs. >> Any of the three inputs may be switched to the VOUT line, but when on >> LiPo battery, this will only be 3.2 to 4.2 Volts, which is not within USB >> spec for Vbus. >> >> So, if you are running off of 4V LIPO battery, there is no on-board >> source of 5 Volts for the USB ports. >> You may have to provide your own boost converter or other 5V source. >> >> --- Graham >> >> == >> >> On Friday, November 10, 2017 at 9:30:35 AM UTC-6, [email protected] >> wrote: >>> >>> I, too, am curious about how to do this, while using the on-board USB >>> jack in host mode (maybe with an OTG adapter and a wi-fi dongle?). Has >>> anybody else attempted this yet? >>> >>> -- Will Bain >>> >>> On Monday, November 6, 2017 at 6:30:09 PM UTC-7, Shannon Mackey wrote: >>>> >>>> It isn't obvious to me how to power the PocketBeagle with a LiPo >>>> battery. >>>> >>>> TP 5/6/7/8 don't seem to be pulled out the way they are on the regular >>>> BBB. and the Bat+Bat(temp?/-?) isn't giving me any satisfaction. >>>> >>>> I was hoping that I was overlooking something that someone here could >>>> point me to. Otherwise, I'll try further to compare schematics to find >>>> what I'm looking for. >>>> Thanks for any assistance! >>>> >>>> >>>> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/4332a157-b7c3-4ea9-a93a-f1735a2f1b43%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
