Some time ago I started porting to an enhanced PIC 16F1936 to replace =20
16F883's I've been using, so I could get a faster internal osc and =20
touch-switch capability.  But there are some annoyances (bugs which =20
have unpleasant workarounds in the errata).  But now there's a =20
18F23K22 that I'm thinking I'll use instead.  Same package & pinout =20
(so boards don't change), no banking, faster (in case I need it), and =20
no Vcap, so I'll get that pin back.

However, I notice that the Zain (min recommended analog source =20
impedance) on the 18F is 3k, vs. 10k on the 16F.  And the 18F does not =20
state that higher is okay with a 0.01uf cap as with the 16F.  Why is =20
this?  Did something change, or did they re-think the specs on the =20
same module, or...?  I've been using sources with over 20k impedance =20
with no problems, but with a much longer sample-cap charge time.  Is =20
there some reason I won't be able to do this with the 18F part?

Cheers,
-Neil

--=20
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