I use a production programmer to program 2 different pics.  While
troubleshooting a problem with one of the chips, Microchip suggested
lowering VPP to 12.75volts.  I did this and began programming both types of
chips we use.  Up to this point I had never had a chip fail to verify at the
extremes, but after lowering vpp, I had about a 10% failure rate.  VPP is
now back at 13.2volts.  Anyway, I mention this because they are both flash
parts, and it does seem important to still verify.

Jim

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Wouter van Ooijen
Sent: Monday, April 12, 2004 15:19
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: RE : [PICLIST] [PIC]: Production programming device?


> They answer me that Flash device do not need to be verified
> at multiple voltage...

I got the same impression, yet the official documents still state that a
production progger should verify at the extremes of the power voltage.
But those documents contain other errors, so why not this one too :)

Yet a producer of programmed PICs might want to use a production
(multiple-voltage-verify) progger for non-technical reasons (for
instance to avoid blame).

Wouter van Ooijen

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