Hi, **If not, have you found the P1.1<=>P1.7 to be stable?
It has worked for me. No more random reboot after this. I'm working in a clone board using the same IC as the PB, when they arrive i will test stability powering from VIN and VUSB. I have than this test on the BBBW and not detect any issue, although the ICs are not the exactly same ( OSD335x vs OSD335x-SM). Has anybody powering the OSD335x-SM from VIN with no stability problems? Thanks, Pablo Pablo El mar., 11 dic. 2018 a las 9:44, <viels...@allocor.tech> escribió: > We are seeing something similar on a board we designed using USB1 host. We > have PB powered through VIN, with P1.7 floating and are seeing spurious > reboots a few times per day. We are running on latest 9.5 image. > > Our initial thought was that it was related to our 5V supply on Vin, and > were going to start adding capacitance, and doing some testing based on > this line of thought, but it seems you've already been down this road and > it did not have an impact. Have there been any new findings since July? If > not, have you found the P1.1<=>P1.7 to be stable? In our case this would be > fine since we remove the uUSB connector anyway. > > Thanks > > -- Brian > > On Monday, July 30, 2018 at 10:53:35 AM UTC-4, Graham wrote: >> >> Yes it is a real world scenario. >> >> I don't recommend you do it unless you are really knowledgeable in the >> way that USB power works, and are willing to accept the consequences if you >> do it wrong. >> A 100 Ohm resistor is way too high to power a PocketBeagle through. >> If you make it low enough to cross-feed power between the pins, then it >> is too low to prevent problems. >> >> Rather than design a circuit that will allow it to work safely under all >> circumstances, I suggest the PMIC and control software in the PocketBeagle >> get fixed, so it works as well as, and just like a BBB. It is supposed to >> be the same base parts. >> >> In the meantime, I suggest that shorting Pin 1 and Pin 7 be restricted to >> use as a workaround, in the event you need to power a PocketBeagle from 5 >> Volts only, and not plug in a USB source of power at the same time, or >> defeat the USB power lead if you do need to plug in USB for >> control/communications. >> >> --- Graham >> >> == >> >> On Sunday, July 29, 2018 at 10:17:11 PM UTC-5, acheesehead wrote: >>> >>> Here's an example. PB is powered by external 5V through Vin. Then, user >>> hooks up a powered USB hub to Vusb interface to hook up peripherals through >>> the USB hub. Not an unreasonable scenario. >>> >>> Nothing that I would do of course! >>> >>> >>> On Sunday, July 29, 2018 at 9:01:52 PM UTC-6, acheesehead wrote: >>>> >>>> I am just worried about somebody powering from Vin and Vusb >>>> simultaneously. >>>> >>>> I have seen crazier things happen. Seems like a safety net. ID10T thing. >>>> >>>> >> >> >>> On Sunday, July 29, 2018 at 3:26:01 PM UTC-6, Graham wrote: >>>>> >>>>> >>>>> It depends what you are trying to do and what you are worried about. >>>>> >>>>> I would not recommend trying to power it from both USB and External 5V >>>>> with Pin 1 and Pin 7 shorted. That is just a work-around to keep it >>>>> running when powered from external +5 V. >>>>> >>>>> --- Graham >>>>> >>>>> == >>>>> >>>>> On Sunday, July 29, 2018 at 1:35:15 PM UTC-5, acheesehead wrote: >>>>>> >>>>>> Should there be a low Ohm resistor between P1 and P7? Maybe 100 Ohm? >>>>>> Just in case an external USB 5V has a difference between the P1 VIN. >>>>>> >>>>>> >>>>>>>> -- > 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/139919f2-1758-4ab1-958a-fa242b1bb8fc%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/139919f2-1758-4ab1-958a-fa242b1bb8fc%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- 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/CAEObdD3mhKfATyEbCR7XDBeQNCnGY4qVFi3YnJ0U6W60EgTtbQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
