The PMIC is sensitive to slow ramping power supplies. A 10uF capacitor is also a little small. You could be seeing a dip in the voltage when the PMIC does kick in and it could in some instances cause it to shutdown.
Gerald On Wed, Mar 5, 2014 at 2:16 PM, <edwin.j....@gmail.com> wrote: > > Using the Beaglebone black Revision A6A. I powering it with supplying 5V > to the Vdd pins. The 5V is coming from an adjustable regulator with an > enable line. Also I have a 10uF tantalum capacitor on the regulator's > output to avoid sending a noisy 5V. > > When that enable line goes high, the beaglebone black does not power on > all the time. Sometimes the BBB boots properly. However, instead of > powering on sometimes, it seems that the power management chip on the BBB > is switching Vdd to no load. I still have a similar result with different > tantalum cap values. > > What is the state of the switch in the power management chip on a rising > edge of Vdd? Has anyone else had a problem powering the BBB with Vdd? > > -- > 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 beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
