Jinx, Lawrence, thanks for the ideas. I may just try one of those in the future. In the meantime, I'm going to save the data more frequently and strongly discourage the users from yanking the battery without downloading the data first. Believe it or not, that is a significant improvement over the current product. Currently, it crashes and frequently corrupts the data entirely if the battery is removed without warning. Mike H. >The second arrangement, with the normal power supply on full power, the >supercap charging through a resistor and powering the PIC through a diode, >is in fact required to keep the supercap from drawing inordinate power-up >surges. The only drawback is your PIC has to be powered for at least 30 >second s(or whatevewr the RC timeout is) to ensure that the supercap is >able to ride through. I have seen this arrangement on commercial >products. > > > >-- Lawrence Lile >Senior Project Engineer >Toastmaster, Inc. >Division of Salton, Inc. >573-446-5661 voice >573-446-5676 fax > > > > >Jinx >Sent by: pic microcontroller discussion list >02/09/2004 04:19 PM >Please respond to pic microcontroller discussion list > > > To: PICLIST@MITVMA.MIT.EDU > cc: > Subject: Re: [EE:] Post battery pull runtime > > >Can you adapt either of these ? (drawings from memory - just >saved many folders to CD and haven't documented them yet >to make finding actual diagrams easy) > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > > > >-- >http://www.piclist.com#nomail Going offline? Don't AutoReply us! >email listserv@mitvma.mit.edu with SET PICList DIGEST in the body _________________________________________________________________ Choose now from 4 levels of MSN Hotmail Extra Storage - no more account overload! http://click.atdmt.com/AVE/go/onm00200362ave/direct/01/ -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu