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.

here is a reference for you on the subject..
http://en.wikipedia.org/wiki/Series_and_parallel_circuits

On 12/11/06, Drew Harry <dharry@media.mit.edu> wrote:

Ah, okay. If I power both gumstix and robostix through their own
power jacks, can I still connect them through the 60pin connector? Or
do I need to do something special to make sure the robostix doesn't
try to also provide power?

Drew

On Dec 11, 2006, at 12:36 AM, Dave Hylands wrote:

> Hi Drew,
>
>> When I attach a gumstix+wifistix combo to the robostix, the gumstix
>> restarts itself frequently. I've got the pin 3 -> pin 4 bit to make
>> sure the gumstix starts up, and it does start up fine each time (we
>> can see the network it creates, ssh in, etc). If it's not connected
>> to the robostix, it works indefinitely. Has anyone seen this? Any
>> ideas what I should do to fix it?
>
> The voltage regulator on the robostix can only supply 500mA. The
> wifistix draws quite a bit of current and it could be causing the
> robostx voltag regulator to go into thermal shutdown.
>
> Powering both the robosix and the wifistix will most likely fix
> this stiuation.
>
> --
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
>
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