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'[PIC]: inputs alive while PIC powered down'
2002\05\03@131656 by Micro Eng

picon face
There was some discussion about this a lil while back and I don't recall the
final thoughts.  From what I remember, if you have inputs that are coming
from a device that is not on the same power source as the PIC, that it could
actually power it up thru the ports. Was this the case?  Assumption that it
applies whether its an analog or digital port looking at these.

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2002\05\03@165131 by Jinx

face picon face
> from a device that is not on the same power source as
> the PIC, that it could actually power it up thru the ports.
> Was this the case?

Yes, through the port diodes

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2002\05\03@215902 by Bob Ammerman

picon face
Yes, this can happen because the protection diodes to Vdd turn on.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Micro Eng" <spam_OUTmicro_engTakeThisOuTspamHOTMAIL.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Friday, May 03, 2002 12:13 PM
Subject: [PIC]: inputs alive while PIC powered down


> There was some discussion about this a lil while back and I don't recall
the
> final thoughts.  From what I remember, if you have inputs that are coming
> from a device that is not on the same power source as the PIC, that it
could
> actually power it up thru the ports. Was this the case?  Assumption that
it
> applies whether its an analog or digital port looking at these.
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at
http://explorer.msn.com/intl.asp.
>
> --
> http://www.piclist.com hint: The list server can filter out subtopics
> (like ads or off topics) for you. See http://www.piclist.com/#topics
>
>

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