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

From: address@hidden
Subject: Re: [Paparazzi-devel] Tiny13 3V3 Rail Problem (11 ohms)
Date: Mon, 15 Oct 2007 01:57:56 GMT

Matt, the only component that will have trouble with 17V is the big tantalum input cap on the 5V line.  If this is damaged, you will have noisy 5V or a battery short.  The 1117 will repeatedly turn on/off when the 3V bus is shorted - I've seen this happen with bad gps soldering or external shorts.  Maybe the noisy 5V line killed some of the 3V caps? 

-- Matthew Currie <address@hidden> wrote:

 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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