Hi, The past year i have to power 3 pocketbeagle from Vusb because of the random reset when connecting to Vin. This was the only thing that worked for me. Did a lot of testing adding capacitance and non work.
El lun., 12 ago. 2019 a las 10:52, Jason Kridner (<[email protected]>) escribió: > On Sat, Aug 10, 2019 at 9:50 PM Graham Haddock <[email protected]> > wrote: > >> What I would do is some minor surgery on the PocketBeagle, disconnecting >> the +5V lead coming in the microUSB connector. >> The easiest way to do this would be to remove FB1 (ferrite bead in series >> with USB +5). >> Easy with "hot tweezers", or a pair of small soldering irons. >> To restore the Pocketbeagle to factory configuration, solder FB1 back in. >> >> > Whatever instability problems you are seeing, I don't see this addressing > it. The PMIC is designed to dynamically switch between the P1.1 ("AC power" > in PMIC terms, which always bothers me because it is never AC, but instead > DC assumed to come from an AC-powered wall-supply). If somehow there's not > enough capacitance to make the switch cleanly, I'd suspect you are doing > something rather odd with the *load* you are putting on it. What else do > you have connected? > > Anyway, I put both "AC" (P1.1) and "USB" (P1.7) on the headers on purpose > and the full expectation is that if you are putting a power supply in (and > it isn't a battery), you'll use P1.1. If it is battery, I also give you > that option at P2.14 (BAT). > > >> Short P1-Pin-1 and P1-Pin-7 together, and power the Beagle from whatever >> you are going to power it with at +5V. >> No issues with instability. >> > > OK, now you are just asking for trouble. There's no justification for > doing that. > > If the design isn't working as intended, then, let's talk about that and > details, such as what you are seeing on a scope and P2.13 (VOUT), which is > the output of the power mux on the PMIC, also referred to as SYS_5V on > BeagleBones. Ultimately, this is used to provide the power to the > regulators for the other subsystems. Perhaps your problem is drawing too > much current from it? > > It can be argued I put too many power options on the header, but I tried > to keep it flexible for people embedding it onto something. You have a lot > of flexibility and I don't see any need to encourage people to alter the > board. > > -- > https://beagleboard.org/about - a 501c3 non-profit educating around open > hardware computing > > -- > 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/CA%2BT6QPnR-AOUOp%3DPouR%3DBs%3D%3DFn_NKqTOJM%3DprURJFToD%3DQGaXw%40mail.gmail.com > <https://groups.google.com/d/msgid/beagleboard/CA%2BT6QPnR-AOUOp%3DPouR%3DBs%3D%3DFn_NKqTOJM%3DprURJFToD%3DQGaXw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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/CAEObdD2roPt_KjXtQJj15GSrmbndBCB2KzBkvXvCAfBoT3q-SQ%40mail.gmail.com.
