At 06:19 PM 2/22/00 -0800, you wrote:
>Guys and Gals (if any):
>
>Been following this thread with great interest....
>Recently, I had some odd problems with our loggers not going into sleep
>mode--or so it appears.  Instead of the usual 30-70 uA of current draw from
>the battery, I am seeing 1-2 mA.  Or what is even more baffling, a drop to
>sleep followed by a single slow rise to about 600 uA followed by a fall
>back to normal sleep current.
>
>Don's comments on the IR drops on the MCLR pull up resistor suggest this
>might be a possible cause--or effect from improper/ignorant handling of the
>parts/boards.
>
>Any body have a handle on the mechanism of this failure--ie. what is really
>going on inside the pic?
>
>Kelly
>

Kelly,

You should be able to determine whether your chips are experiencing
what I have been talking about by measuring the IR drop across the
pullup resistor on MCLR. I was seeing leakages of 100 - 500 uA, or
would you believe, up to 2.5v across 5K.

Also, modern CMOS chips seem to be so robust, I'm not so sure
handling causes all that many problems anymore - unless you're
petting the cat while plugging in the chips.

Otherwise, why don't you start a new thread about sleep mode
problems (!!!). [it never ends].

- Dan Michaels
Oricom Technologies
http://www.sni.net/~oricom
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