No, I haven't, but that may be something to look into
I suppose.  It would require a redesign of the circuit
board though.  Couldn't hurt anything could it?

--- "Fr10@mweb.co.za" <fr10@mweb.co.za> wrote:

> Have you tried a series resistor
> 
> "Rs may be required in HS mode as
> 
> well as XT mode to avoid overdriving crystals with
> low drive
> 
> level specification."
> 
> Regards
> 
> Francois
> 
> 
> 
> > I'm experiencing about a 3% failure rate on my
> PIC-based product.  Except
> > for one time that a wire was cut, the rest of the
> time it's been the 20MHz
> > crystal that's died.  I'm using a 16C58B chip and
> the crystal is an
> Abracon
> > ABL-20.000MHZ-B2.  Is this a normal failure rate
> for this type of crystal?
> > Also, I'm not sure what the two capacitors should
> be.  Right now, I'm
> using
> > 33pF capacitors with the crystal, but from what I
> read in the PIC manual
> > that may not be right.  The PIC manual recommends
> 15pF, but there's a note
> > that it should be 30pF if VDD > 4.5 (I'm using a
> 78L05 so VDD is 5 volts),
> > and Abracon lists "Shunt capacitance" for this
> crystal at 7pF & "Load
> > Capacitance" at 18pF.  Being almost totally
> ignorant of circuit design,
> I'm
> > not sure what the right capacitors are, so I'm
> blindly using what someone
> > else told me to use, but could using a capacitor
> that's too big cause
> these
> > failures?
> >
> > Thanks
> > -Mark
> 
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