>If the on-gumstix regulator(s) are shutting down, try lowering the
>v_batt supply to 4V if you can from 5V.

I scoped the wifistix 3.3V output.  It was a steady 3.3V before during and after the crash/reboot.  Same transmit timeout error again this time.

I measured the case temp of the regulator on the wifistix (U$5).  It was 119F.  If I recall correctly,  this is in spec for that part.

I also measured the case temp of the wifi module.  It was 140F.  Is this in spec for the module?

The ambient temp is 103F, which should be in spec for all of the gumstix components, right?

Steve

On 5/14/07, Craig Hughes < craig@gumstix.com> wrote:
On May 14, 2007, at 2:37 PM, Steve Sakoman wrote:

> Drew,
>
> Good thought, but the weather has been bone dry.  Today it's 100F
> in the equipment area with a RH of about 10%.  I'm in shorts & t-
> shirt and the sweat is evaporating as fast as it comes out :-)
>
> I am beginning to suspect thermal shutdown on a linear regulator.
> As the temperature has climbed I am seeing the problem with greater
> regularity.  I need to get back to my office to look at the gumstix
> schematics to find places to probe the 3.3V supplies.
>
> Thanks for helping with the brainstorming!

If the on-gumstix regulator(s) are shutting down, try lowering the
v_batt supply to 4V if you can from 5V.

C




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