I would love to be able to ditch a few extra discrete components on my boards, however I would love less to get a call about a defect in the boards due to crappy oscillators. For my purposes, a few visits to installed sites by service technicians would more than outweigh the cost of simply including external oscillators on the boards so I chose to keep the parts. One risk you take when you decide to disregard the data sheet is that while you might have one or two parts that operate within your tolerances, but you may not be able to rely on the majority of the parts exhibiting the same behavior. On Tue, Sep 25, 2012 at 5:57 AM, IVP wrote: > > > Or simply believe what the datasheet says > > You could, although I've found the datasheet is usually quite > conservative, and the frequency is likely to be pretty accurate > > If it were me I'd measure FRC just out of curiousity. However, > it will be temperature and voltage sensitive (if the module is > comparable to other PICs), so no matter how accurate it is > under certain conditions, it does have that against it > > For what the OP is doing I think I might prefer the comfort > of a crystal, unless he finds FRC is stable enough over the > working conditions > > Joe > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 Glen Wiley "A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away." - Antoine de Saint-Exupery --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .