Add a battery to the board to keep it up long enough to shutdown if the failure is long or to not be impacted by momentary losses of power, which can also corrupt the filesystem on either the eMMC or the SD card.
Gerald On Thu, Aug 7, 2014 at 9:16 AM, Rico <[email protected]> wrote: > 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]> 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]. >>> 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.
