Hi Rico, Any reason that you can't use a cape to solve the problem? The PowerCape <http://elinux.org/AndiceLabs:PowerCape> will prevent brown-outs and transients from bringing the BB down. Your application/script can monitor DC power good and battery voltage/current and then do a clean shutdown if necessary. The cape can also restart the system when DC power returns. It's my cape so feel free to ping me with any questions about it...
-Ron On Thursday, August 7, 2014 9:16:07 AM UTC-5, Rico 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. 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