David Covick wrote: "I left it off due to the battery being very close to the PIC" I wonder what the internal capacitance of the battery is at the highed frequencies? This just might be working in your favor! Jim ----- Original Message ----- From: "Micro Eng" To: Sent: Monday, July 08, 2002 3:03 PM Subject: Re: [PIC]: .1uf between Vcc and gnd ??? > From my experiance....the caps across the parts are not really for surge > suppression, but more to keep the voltage from sagging when the parts are > switching. The caps store the energy and when needed....gives it. > > > >From: David Covick > >Reply-To: pic microcontroller discussion list > >To: PICLIST@MITVMA.MIT.EDU > >Subject: Re: [PIC]: .1uf between Vcc and gnd ??? > >Date: Fri, 5 Jul 2002 21:24:10 -0700 > > > >Gabriel, > > > >I have a product on the market with NO caps across Vcc and Gnd. > >It is a PIC12C672 run with a 3.6V lithium battery. > >Thousands sold and around the world and not seen any issues from leaving > >caps off. > >I decided to do this to save parts count/cost. Normally I use a 0.1uF, but > >in this case I left it off due to the battery being very close to the PIC > >(short track). > >I'm sure someone on this list will tell me that what I did was wrong, but > >since it works fine I'd be happy to hear from someone at to why it is a bad > >idea. > > > >David > > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.