At Fri, 9 Aug 2019 16:23:26 -0700 (PDT) beagleboard@googlegroups.com wrote:
> > > > Robert: > > It has been a while, almost a year since I did any testing with the > PocketBeagle. > But I don't think anything has changed relative to my comments below. > Maybe someone can correct me if I am wrong, and some things have been fixed. > > P1-Pin-1 is Vin, and is equivalent to the Barrel Jack input on the > Beaglebone Black, it > is a separate power supply input, and is isolated from the microUSB > connector power. > > P1-Pin-7 is hardwired to the +5 pin on the microUSB connector, USB Port 0. > It is not clear from the schematic, but is visible if you view the PCB > board plots. > Or check it with an Ohmmeter. > > I found that the PocketBeagle, when powered exclusively by P1-Pin-1 would > randomly > crash about once every 24 hours of operation, without any apparent reason, > or > any clue in the logs. I hope that this has been fixed, but I have seen > other reports > since I initially reported it, and nothing since that reported a fix. Well, I am not expecting an application that would run 24/7. I am working on model RR control circuits. It does not sound like this should be an immediate problem. > > The only workaround I found was to power P1-Pin-1 and P1-Pin-7 in parallel, > in which case > it does not crash, but now there is no isolation between USB +5V and your > independent > PB power supply, and, as you are concerned about, all kinds of cross-feed > and back > powering can occur. That does not sound like a really good idea. Question: if the board was powered from P1-Pin-1 *and* the USB will there be problems? Right now, that is my main concern. Jacking in the USB (for file transfer mostly, since I can use the serial console for debugging) while the board is being powered via P1-Pin-1 is something I'd like to be able to do, but don't want to fry anything. > > I suggest you read the email thread "PocketBeagles are Unstable" started > 11/24/2017 Will have a look. > > --- Graham > > == > > > On Friday, August 9, 2019 at 2:33:15 PM UTC-5, Robert Heller wrote: > > > > If I am applying a 5V power supply to the Vin pin (P1-1) of a Pocket > > Beagle > > (say from an expansion board that includes a power supply), is it safe to > > also > > plug in a [powered] micro-USB cable? That is, does the Pocket Beagle have > > a > > power protection / isolation circuit? > > > > > > > -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services hel...@deepsoft.com -- Webhosting Services -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/20190810013320.E34BB26C009A%40sharky3.deepsoft.com.
