Can the 3V3 supply of the Beagle drive all the components regarding max current? Could that blow the beagle like described at the beginning?
Am Dienstag, 16. September 2014 18:18:25 UTC+2 schrieb Gerald: > > It has to be HW or the application and use of the hardware. Maybe you have > a short or some other issue with your assembly. > > Gerald > > > On Tue, Sep 16, 2014 at 11:13 AM, Ulli <mitterma...@gmail.com > <javascript:>> wrote: > >> @Gerald: What else can be wrong except the hardware design? >> >> Am Montag, 15. September 2014 23:25:11 UTC+2 schrieb Ulli: >> >>> >>> I am not sure what you mean with "to disable the buffer before until you >>> come up". >>> Directly connect the Beagle SYS_RESETn pin to the pin 29 of the Atmega`s? >>> >>> What would be the positive effect by using the SYS_5V. I think it is >>> directly connected to the Beagle DC plug. So, it can drive more current? >>> >>> Two more ideas: >>> * would it be helpful to add a 0,1µF capacitor to the beagle voltage >>> supply pins on the header, between VDD_3v3 and Gnd very close to the beagle >>> headers? >>> * would it be better to completely supply my cape from SYS_5V and >>> create the 3v for the Atmegas and the other components on the cape with the >>> MCP1703? >>> >>> Am Montag, 15. September 2014 23:14:45 UTC+2 schrieb Gerald: >>>> >>>> Nothing else jumps out at me. The 5V rail you are using is on before >>>> the board is powered up, but I don't think that should matter. You could >>>> switch to SYS_5V, no reason not to.As you only have four wires to the BBB, >>>> you might try adding some isolation there, and use the RESET signal to >>>> disable the buffer before until you cone up. >>>> >>>> There may be something else in your setup. But, schematic wise >>>> I don't see anything else. >>>> >>>> Gerald >>>> >>>> >>>> On Mon, Sep 15, 2014 at 4:09 PM, <mitterma...@gmail.com> wrote: >>>> >>>>> Yes of course. I added this option just to run the cape for first >>>>> tries on a USB port. >>>>> >>>>> Could you find any other problems? I am currently thinking to connect >>>>> the SYS_RESETn of the BBB directly to the reset pin of the atmega`s? >>>>> >>>>> Am Montag, 15. September 2014 23:06:09 UTC+2 schrieb Gerald: >>>>>> >>>>>> Looks like you have shorting posts for your standalone versus cape >>>>>> mode. If you ever by accident plug in the standalone mode into the BBB, >>>>>> then you will damage the board for sure. >>>>>> >>>>>> Gerald >>>>>> >>>>>> >>>>>> On Mon, Sep 15, 2014 at 3:51 PM, ulli <mitterma...@gmail.com> wrote: >>>>>> >>>>>>> >>>>>>> You are right, there must be something wrong but I do not know what. >>>>>>> I understood that the blocking capacitor is missing. But I do not >>>>>>> know if that is the only mistake and this is the reason why my beagle >>>>>>> stopped working because of my cape.... >>>>>>> >>>>>>> I updated the circuit to that configuration like it is when I have >>>>>>> it connected to the beagle. >>>>>>> https://drive.google.com/file/d/0B8Fq4yYMgG7uTFlIRjdjcGRUYlE/ >>>>>>> edit?usp=sharing >>>>>>> >>>>>>> >>>>>>> Am Montag, 15. September 2014 22:32:54 UTC+2 schrieb Gerald: >>>>>>>> >>>>>>>> So your contention is that this is all correct? Do I read you right? >>>>>>>> >>>>>>>> Gerald >>>>>>>> >>>>>>>> >>>>>>>> On Mon, Sep 15, 2014 at 3:24 PM, <mitterma...@gmail.com> 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, <mitterma...@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...@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...@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...@googlegroups.com <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. 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