So your contention is that this is all correct? Do I read you right? Gerald
On Mon, Sep 15, 2014 at 3:24 PM, <[email protected]> wrote: > 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]> 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]. >>> 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.
