That is a great suggestion. Gerald
On Thu, Aug 7, 2014 at 9:50 AM, Ron B. <[email protected]> wrote: > 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. > 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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