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 [big snip] >>Also, as described on my website, I discovered the problem using >>UV-erasable /JW parts. The parts would start programming/running >>flaky after not too many erasures. After trying everything (new >>eraser, fiddling with Vpp & erase times, different download >>times, writing bug-free code(!!), on and on), I discovered a >>large IR drop across the pullup resistor, so I started using >>low value pullups, and pulled the cap off. Also, I don't think >>I ever saw the problem with electrically-erasable parts - 16C(F)84s. >> >>- Dan Michaels >>Oricom Technologies >>http://www.sni.net/~oricom >>================== >> >> William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems & San Diego, California, USA