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Thread: PicPocket
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face BY : Dan Michaels email (remove spam text)



Tony Nixon wrote:
........
>It now has user set verification voltages from 2V to 6V in 0.25V steps
>and can be easily calibrated at anytime by the user.
>
......
>The PIC's are supposed to be programmed with VccP at 5V, but can be
>verified afterwards at lower or higher voltages.
>

Hi again Tony,

Another potential hazard occurred to me. If the programmer does
power the target during ICSP [which you apparently will have to
do if you want to both program at 5v and then test over 2-6v],
it is likely that the programmer will be back-driving current
into the v.reg on the target bus.

I dealt with this problem on the new PIC'40 SBC that I am producing
by having a jumper for isolating the v.reg from the bus. You might
want to suggest something similar in your PP ops manual.

BTW, anyone got a good feel for how a v.reg reacts when you
power it up from the wrong direction - or otherwise drive its
ouput node higher than its input node?
[proactive response --> hmmm, just as I thought].

regards,
- Dan Michaels
Oricom Technologies
http://www.users.uswest.net/~oricom
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