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.
