Is this thread concluded? I didn't see a solution to the puzzle, what finally cured the problem; would love to know that. Regards, Anand ----- Original Message ----- From: "Olin Lathrop" To: Sent: Monday, February 09, 2004 6:46 PM Subject: Re: [PIC]: PIC programmer puzzle > Wouter van Ooijen wrote: > > Note that there will also be protection diode current through your > > progger-PIC when you run the target at 6.0 Volt (max for a 16C84), or > > are you running the progger PIC at 5.5 and limiting the Vhigh to 5.5? > > The circuit can adjust Vdd up to 6V, but so far I've only used it at 5.5V. > Again however, the target Vdd will be brought up long after the controller > is powered up, so there is no danger of SCR latchup. Even if you figure > only 500mV drop accross the protection diode and a Vdd of 6V, that's only > 250uA thru the diode. The other direction is the worse case. With a target > Vdd of 2V there will be 1.25mA thru the protection diodes of the target PIC. > > > ***************************************************************** > Embed Inc, embedded system specialists in Littleton Massachusetts > (978) 742-9014, http://www.embedinc.com > > -- > 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 hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu