Searching \ for 'Re[2]: Power Off PIC Happenings' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: techref.massmind.org/techref/power.htm?key=power
Search entire site for: 'Power Off PIC Happenings'.

Truncated match.
PICList Thread
'Re[2]: Power Off PIC Happenings'
1997\02\20@161352 by Craig Knotts

flavicon
face
    Problem is, you don't know that it WILL run properly off that power.
    I've found that a running 16C5x processor with a Vdd of 1.2-1.5 volts
    will scramble the file register contents, and presumably the PC.  This
    is certainly not a desireable condition.


______________________________ Reply Separator _________________________________
Subject: Re: Power Off PIC Happenings
Author:  Mike <spam_OUTerazmusTakeThisOuTspamWANTREE.COM.AU> at Internet
Date:    2/21/97 3:32 AM


At 02:22 PM 20/02/97 -0500, you wrote:
>Well, I've had a similar problem with a PIC16C55 running itself off
>external sensor input lines!  I finnally had to use a relay that shut the
>Vcc to GND after the power was off (the inputs didn't have enough current
>to drive the relay without main power)  In the future I plan to use optical
>isolation to eliminate the problem...  I wish there was a slicker way...
>Anybody know how to ensure the PIC will shut off even with voltage applied
>to its inputs/outputs?

Why does it HAVE to shut off if there's enough power to run it from
the sensor lines ? Unless its a power waste - just use another I/O pin
to read the power etc So if it keeps running then effectively make it
do nothing by a continuous loop - or think up some clever way for it
to do something (useful) when its not running - like self tests }:o)

Rgds

Mike


Some say there is no magic but, all things begin with thought then it becomes
academic, then some poor slob works out a practical way to implement all that
theory, this is called Engineering - for most people another form of magic.
                                                                      Massen

More... (looser matching)
- Last day of these posts
- In 1997 , 1998 only
- Today
- New search...