Since the PIC is apparently malfunctioning, either the PIC is the=20
problem or the environment the PIC operates in is the problem.

Run the PIC from a good quality linear supply.  Slowly lower the supply=20
as the battery would normally do and see if the problem persists.  Find=20
out if the PIC can work at all over the voltage range you need.  If it=20
can then something else is afoot.

The high current switcher will pull more and more current as the battery=20
voltage drops.  And the battery internal resistance will be going up. =20
This could easily produce negative going spikes on the battery output=20
which is directly connected to the PIC, is it not?

On 4/28/2014 8:53 AM, Dwayne Reid wrote:

 > I'm still open to suggestions. I'm reluctant to engage Microchip
 > Technical Support right now because they are *SO* un-responsive.
 > dwayne


--=20
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