Your first connection does not work, because you are trying to power the USB1 from the USB_VIN, but since the is no power going into USB_VIN on USB-0, there is no power to come out USB-1. This only works when the board is powered from USB-0 The schematic does not tell you, but USB_VIN, USB0_VIN and USB1_VIN are all connected together.
VIN is a totally separate power supply input Since you are powering the board from VIN (P1-01) you need to hook the 5V line on your Micro-USB board to P1-01 and P1-05. In this case, it will work, although you have no current limit protection from a short on the 5V line in a downstream USB device, which is required by the USB spec. So, only plug in USB devices and cables you trust. I would not power the USB-5V-VBUS from the SYS-VOUT, because SYS-VOUT is limited to 0.2 A or so, and many USB devices draw more current than this (USB-2 devices are allowed to draw up to 0.9 A) --- Graham == On Thursday, November 16, 2017 at 5:11:52 PM UTC-6, [email protected] wrote: > > I, too, am wondering about the best way to provide power to the board and > to a device connected to USB1 as host. Here is how I learned to hook up a > micro-b breakout to USB1 and also how I intend to provide power to the > board. The problem is that there is no measured voltage at USB1: > > > <https://lh3.googleusercontent.com/-XyHjxbobnnY/Wg3xGzyvNcI/AAAAAAAAATo/u1ufBwtum9c4KA6T6zjnu38x4cwwQ3TNQCLcBGAs/s1600/PocketBeagle_microUSB_1.png> > > I was wondering if I could just power the USB1 device from P1_24 SYS VOUT > (which does have power when board is supplied by P1_01 SYS VIN) like this: > > > <https://lh3.googleusercontent.com/-l4RYr7WmaGU/Wg3xqYECajI/AAAAAAAAATw/ipK3CZmhG18cieC-bnMLV04PfPBl_hRRACLcBGAs/s1600/PocketBeagle_microUSB_2.png> > Would it be harmful to do it this way? Are there better ways to accomplish > this? Thanks! > > -- Will Bain > > > On Sunday, November 5, 2017 at 6:59:39 PM UTC-7, Graham wrote: >> >> Further research, looking at the Eagle board and schematic files for the >> PB, it appears that USB0.VIN and USB1.VIN are both directly connected to >> VIN.USB >> Which explains why I had no power on my USB1 host port when connected >> like the Fritzing diagram, since I am powering from VIN currently. >> >> So the question becomes,,, >> What is the best way to power USB1 VBUS as a host if I don't know in >> advance whether the customer application will run from VIN or VIN.USB? >> >> --- Graham >> >> == >> >> On Sunday, November 5, 2017 at 6:58:06 PM UTC-6, Graham wrote: >>> >>> I note that there is a PocketBeagle pin P1-7 named USB1-VIN. >>> >>> I don't find any connection on the PB schematic, other than to P1-7. >>> >>> It was connected externally in all of the USB1 host discussions and >>> Fritzing diagrams. >>> >>> The name would imply that it is a way to deliver power to the board when >>> USB1 has an external 5 Volt power source. >>> >>> I guess the basic question is whether this needs to be used/connected >>> when USB1 is functioning as a host. >>> >>> --- Graham >>> >>> == >>> >> -- 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/baf74ece-3868-41d8-a46b-abc93678a101%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
