Your regulator must be turned off until the VDD_3V3 rail comes up. Right now it comes up almost immediately as it is powered from either the expansion header or a weirdly designed 5V DC input. The idea of gating the ground to control power will not work as you already have a DC path to ground, assuming that all of your grounds are connected together as they should be.
Gerald On Mon, Sep 15, 2014 at 2:45 PM, <mittermaier.u...@gmail.com> wrote: > Oh I understood, I need to add the C1 on each Atmega 3V3 supply. --> > blocking > <https://dict.leo.org/ende/index_de.html#/search=blocking&searchLoc=0&resultOrder=basic&multiwordShowSingle=on> > capacitor > <https://dict.leo.org/ende/index_de.html#/search=capacitor&searchLoc=0&resultOrder=basic&multiwordShowSingle=on> > But could that really be the issue which stopps the BBB running. I can > also not boot the beagle up when I have removed the cape. > When I want to boot up the beagle alone the power led flashes up one > time...and thats it.... > > Am Montag, 15. September 2014 21:29:20 UTC+2 schrieb Gerald: >> >> IC1. Your regulator. >> >> Gerald >> >> On Mon, Sep 15, 2014 at 2:17 PM, <mitterma...@gmail.com> wrote: >> >>> What do you mean with C1? >>> >>> Am Montag, 15. September 2014 21:08:59 UTC+2 schrieb Gerald: >>>> >>>> Looks like C1 is not gated by the 3.3V rail from the BBB connectors. >>>> >>>> >>>> . >>>> Gerald >>>> >>>> >>>> On Mon, Sep 15, 2014 at 1:54 PM, <mitterma...@gmail.com> wrote: >>>> >>>>> Hello all, >>>>> >>>>> I urgently requesting your support! I am desperate! >>>>> I am currently developing a radio cape which has two Atmega328p, >>>>> 3xRFM69 radio modules and some other small things on it. You can find the >>>>> circuit in the following link: >>>>> https://drive.google.com/file/d/0B8Fq4yYMgG7uQ3k3WkJUbG9icWs/ >>>>> edit?usp=sharing >>>>> >>>>> When I use this cape on by BBB, the Beagle stopped working during >>>>> operation. I tried to reboot it but it now do not boot up like the issue >>>>> described in the Beagle Wiki as "Improper Power Down". I never unplugged >>>>> the power cord from the board. It just stopped working. >>>>> When the cape is connected to the beagle the components are sourced by >>>>> VDD_3V3Exp and VDD_5V. So no external power supply. I additionally just >>>>> have the Uart4/5 connected to my circuit.... >>>>> >>>>> I would really appreciate your help. Because I really do not >>>>> understand what the matter is! >>>>> >>>>> THANKS A LOT! >>>>> >>>>> >>>>> -- >>>>> 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...@googlegroups.com. >>>>> 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 beagleboard...@googlegroups.com. >>> 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 beagleboard+unsubscr...@googlegroups.com. > 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
