Re: [Gumstix-users] Gumstix/robostix restarting randomly

[Drew H. <dh...@me...>]

So, I think I see the point you're making here (distinction between  
different internal voltages and which is passed on to the gumstix  
from the robostix) but I can't tell if this means that Jesse's  
suggestion won't work. Do I need to be doing all these board mods to  
plug together a gumstix + wifistix + robostix? If I plug in a second  
adapter into the wifistix, will that work or will it potentially fry  
my boards?

Thanks for all your help - I wouldn't be getting anywhere without  
this mailing list.
Drew


On Dec 11, 2006, at 3:32 PM, Dave Hylands wrote:

> Hi Jesse,
>
> On 12/11/06, Jesse Welling <jes...@gm...> wrote:
>> the tobostix power runs it's own regulator to 5v on the robostix  
>> and feeds
>> 3.3v to the gumstix+other.
>> the wifi-stix has it's own converter... when the two 3.3v co- 
>> mingle it will
>> just boost the available amperage
>> which is what you want.
>
> Actually, that's not quite right. Each board has it's own on-board
> regulator that takes the power jack V_BATT as input. The robostix is
> the exception. It take the power-jack (V_ROBOBATT) and runs it through
> a 5v regulator to produce V_BATT.
>
> This document shows how the power runs with a robostix and other  
> gumstix boards:
> http://pubs.gumstix.com/documents/Powering_a_Gumstix.pdf
>
> I see another document over here:
> http://pubs.gumstix.com/documents/robostix_power.pdf
> that shows another way you can make things work, by adding a wire
> between _BATT and V_ROBOBATT on the gumstix (See page 3 of the
> document).
>
> -- 
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
>
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