Jeremy,
I began systematically removing components that sat directly on the
3V3 line and it wasn't until I removed the LPC2148 that I got >
2Mohm on the 3V3 line. I now figure it was the IC or the solder
connections under/around it. I will add another LPC tomorrow and see
where I am. Thanks for the shot.
Regards,
Matthew Currie
address@hidden wrote:
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:
Group,
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.
Regards,
Matthew Currie
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