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Re: [Paparazzi-devel] Tiny13 3V3 Rail Problem (11 ohms)

From: Matthew Currie
Subject: Re: [Paparazzi-devel] Tiny13 3V3 Rail Problem (11 ohms)
Date: Mon, 15 Oct 2007 16:23:07 -0700
User-agent: Thunderbird (Windows/20070728)


  It was operational for the better part of a day but I did not make measurements as to how stable this was.  As I recently reported, I removed the LPC and the 11 ohm conductance path disappeared so I am now sure it was the LPC in some way.  I will be placing a new LPC tonight to see what happens.  I am merely days away from tuning out the airframe so wish me luck =)


Roman Krashanitsa wrote:
Matt, I had problems with L5973D some time ago. But that would affect also
5V, which you don't mention. I had to go over almost all components on the
bottom side and found in one case 2 blown caps, and in 2 other cases broken

Do you get stable 5V on yours?


-----Original Message-----
rg] On Behalf Of Matthew Currie
Sent: Sunday, October 14, 2007 6:12 PM
To: Paparazzi Devel
Subject: [Paparazzi-devel] Tiny13 3V3 Rail Problem (11 ohms)


  I have a Tiny13 here which was operating happily during the 
day and upon returning the next, it was not.  I was powering 
it with ~ 17V inadvertently which may be relevant to the 
problem.  The symptoms I observed were the 3V3 line coming on 
briefly and then dropping out, pulsing about once per second 
or so.  I removed the LM1117 regulator IC and now measure 11 
ohms across the GND and 3V3 rail.  Before I begin tearing 
components off I wanted to run this past others in case they 
came across something similar.  I can't picture what would be 
causing 11 ohms of conductance across the rail.  In summary, 
it ran for almost 24 hours at a high voltage (17V) so if 
something burnt up, this would explain it.

Matthew Currie

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