> On Oct 28, 2016, at 3:24 AM, Paul Plankton <[email protected]> wrote: > > Am Dienstag, 11. Oktober 2016 21:13:22 UTC+2 schrieb john3909: > You will see some protection circuitry at the bottom center of the sheet. > This ensures the voltage difference between the 3v3 and 1v8 is never greater > than 2V. The BBB does not have any such circuitry so when the 5V drops > quickly, it is possible for the 1v8 to drop quicker than the 3v3 and hence > killing the processor. > > This is strange. I have several hundreds of BBB-based devices out there that > do not have any of these protections. None of them died because of such a > problem. > It is just a matter of time. I had a A5A that I power up and down for years and then the processor pop’d. While investigating the problem, Gerald and I had some discussions and he pointed me to the circuitry that was added in the OSD335x and BeagleBoard-xM boards. I replace the processor and everything is working just fine. Gerald’s advise was to never power down the board. Even powering down the board with the power button won’t prevent this problem.
Regards, John > > -- > For more options, visit http://beagleboard.org/discuss > <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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/a5154197-fdc1-46cc-a694-4ca11d7c7839%40googlegroups.com > > <https://groups.google.com/d/msgid/beagleboard/a5154197-fdc1-46cc-a694-4ca11d7c7839%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/D56D0A07-5A88-4239-95A6-A14E251C3D49%40gmail.com. For more options, visit https://groups.google.com/d/optout.
