I am working on this in my spare time. Basic concept is that you need enough power after you pull power to give the PMIC time to ramp the voltage rails down in order so as not to violate the specification of the processor..
Best idea so far is a super cap on the battery connections. That would require SW to start the shutdown process once power was detected as being removed. I am trying to find a way to do this that won't add too much cost and that does not rely on the SW to start the shutdown process.. Gerald On Wed, Sep 10, 2014 at 2:34 PM, Chris Morgan <[email protected]> wrote: > I would be interested in the outcome of this investigation. We are > using the bbb in a commercial setting, through CircuitCo, and I'm not > sure what the power down ramp will look like. It is possible (and > likely) that the voltage falloff will be slow compared to a quick > unplug, but our devices power up and down relatively frequently. > > Any guidance on this would be appreciated. > > Chris > > > > > On Wed, Sep 10, 2014 at 3:17 PM, Gerald Coley <[email protected]> > wrote: > > > http://www.elinux.org/Beagleboard:BeagleBoneBlack#Improper_Power_Down....All_Revisions > > > > Gerald > > > > On Wed, Sep 10, 2014 at 1:35 PM, <[email protected]> wrote: > >> > >> I have four Beaglebone Blacks that have "died". They all exhibit the > same > >> behavior. When the power is applied the "Power LED" flashes on then off. > >> Each time power is applied this short sequence repeats. My first guess > is > >> that the power conditioning circuit is failing to produce/receive a > "power > >> good" signal. > >> > >> My question is: Have others experience the same issue? Is there a path > to > >> resurrect these four boards? > >> > >> Thanks. > >> > >> -- > >> 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.
