Thanks for your quick answer and very helpful feedback! I am not sure if I understood right.
Currently I have to options to power the cape. 1. Use the cape without the Beagle --> Power supply over the FTDI connector and solder header Pin2-Pin3 connected on the MCP1703 side. --> 5V solder header Pin1-Pin2 connected --> 3,3V will be generated with the MCP1703 from the input voltage VIN 2. Use the cape with the Beagle --> Power supply all over the beagle headers and solder header Pin1-Pin2 connected on the MCP1703 side. Therefore no voltages will be generated by the cape itself... --> 5V solder header Pin2-Pin3 connected. 5V from the beagle. --> 3,3V from the beagle Therefore the atmega`s can only power up when the 3.3v supply of the header is available. The 5v supply is always on thats right. But 5v is only used for LED`s and the Piezo Buzzer and this parts are disconnected with a BC817 from ground. Yes all wires which are named as GND are connected. Do you really see an issue on that? What needs to be changed? Am Montag, 15. September 2014 21:56:47 UTC+2 schrieb Gerald: > > 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, <[email protected] <javascript:>> > 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, <[email protected]> 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, <[email protected]> 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 [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] <javascript:>. >> 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.
