At 01:49 PM 1/27/2004, Jan-Erik Soderholm XA (TN/PAC) wrote: >Dwayne Reid wrote : > > > I'll give a specific example: one of our products uses either > > a 12c508 or a 12f675, depending upon which variant is being > > produced. These are built several hundred at a time with > > blank chips. We use a PS+ to program the chips in circuit... > >Does the PS+ perform verify over the full Vcc range ? >(As a "production programmer" does ?) > >And, if not, is that a (potential) problem ? >Or is it just a "it depends" issue ? :-) Nope - its not a production programmer. However, this has not caused any problems to date. At some point, we will be switching to a programmer that does do verification at the supply limits. The programming algorithms seem robust. Everyone that I've talked to who does do verification at the supply limits has not yet seen a part fail at the supply limits that did not also fail at the programming voltage. In fact, I'd like to pose that same question to the members of the PIClist - Has anyone ever had a PIC verify at the normal Vdd voltage but fail to verify at the supply limits (either above or below the programming voltage)? In other words, Vdd normal: pass, Vdd low: pass, Vdd high: fail (or vice versa). dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 19 years of Engineering Innovation (1984 - 2003) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads