Hello Gerald, What way would that be to fix it? I thoght the problem is the PMIC itself and not the BBB design.
On Thursday, 7 August 2014 15:19:15 UTC+2, Gerald wrote: > > Well, I didn't design the board for that application. There is a way to > take care of that if you are willing to fix it. It is not something that I > will put in the design just for your application. > > Gerald > > > > On Thu, Aug 7, 2014 at 7:07 AM, Rico <[email protected] <javascript:>> > wrote: > >> @ John: >> Thanks for your answer. I measured with a multimeter directly at the BBB. >> The BBB normally even starts with only 4.5V so its definitely something >> wrong with the PMIC. >> >> @Gerald: >> Thank you. The problem is, we are using the BBB in an industrial product >> that has to run 24/7. Replugging the device is therefore no option. >> Powering the BBB with at least 5.1V seems to resolve the problem but I >> wondered if there is a reason for that. >> >> >> >> On Thursday, 7 August 2014 02:13:51 UTC+2, Gerald wrote: >> >>> Unplug it and plug it back in. It was designed to work that way. >>> Temporary power loss can confuse the PMIC and put it in an bad state. >>> >>> Gerald >>> >>> >>> On Wed, Aug 6, 2014 at 6:42 PM, William Hermans <[email protected]> >>> wrote: >>> >>>> John, this happens to me too, but powering via USB. Once in w blue >>>> moon, there seems to be some sort of race condition, or something where >>>> the >>>> BBB is not getting enough power. >>>> >>>> So in order to thwart this I've stopped using shutdown now -r, and >>>> instead use shutdown now -h. Then manually remove / reapply the USB cable. >>>> >>>> >>>> On Wed, Aug 6, 2014 at 3:44 PM, John Syn <[email protected]> wrote: >>>> >>>>> >>>>> From: Rico <[email protected]> >>>>> Reply-To: "[email protected]" <[email protected]> >>>>> >>>>> Date: Wednesday, August 6, 2014 at 3:34 PM >>>>> To: "[email protected]" <[email protected]> >>>>> >>>>> Subject: [beagleboard] Re: Beaglebone sometimes doesn't start after a >>>>> power loss >>>>> >>>>> Sorry to push... Gerald, maybe you have an idea? >>>>> >>>>> >>>>> On Sunday, 3 August 2014 15:28:45 UTC+2, Rico wrote: >>>>>> >>>>>> Hello, >>>>>> >>>>>> I've noticed that the beaglebone black sometimes does not startup >>>>>> after a short power loss, even when pressing the power button, it does >>>>>> not >>>>>> start. >>>>>> >>>>>> To reproduce with a regulated power supply (tested with BBB rev B and >>>>>> C): >>>>>> >>>>>> 1) Output of power supply 5V >>>>>> 2) connect power supply to BBB >>>>>> 3) BBB starts up normally >>>>>> 4) down-regulate the output slowly >>>>>> 5) at 3.5 V, the beaglebone turns off >>>>>> 6) go back to 5V >>>>>> 7) press the power button, the beaglebone won't startup >>>>>> 8) go above 5.1V and press the power button => now the beaglebone >>>>>> starts >>>>>> >>>>> Are you measuring the voltage at the BBB terminals or are you reading >>>>> the voltage from your power supply? Do you use thin wires to connect from >>>>> your power supply to the BBB? My thinking is there is a voltage drop >>>>> across >>>>> the wires of 100mV or more. >>>>> >>>>> Regards, >>>>> John >>>>> >>>>> >>>>>> I've read the datasheet of the PMIC (TPS65217C) but I cannot find out >>>>>> why the BBB starts at 5.1V but not at 5V, has anyone an idea? >>>>>> >>>>>> Many thanks, >>>>>> Rico >>>>>> >>>>>> -- >>>>> 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]. >>>>> >>>>> 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 [email protected]. >>>>> >>>>> 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 [email protected]. >>>> >>>> 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 [email protected] <javascript:>. >> 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. 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