Post by thread:[PIC:] high temp pics

Are there pics available that have a higher temperature rating then the normal 85 degrees c? I am building a device that will go in the engine compartment, and some of the automotive-specific asic's I've seen are rated to 125 degrees c. Regards, Bob -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Bob Japundza wrote: >Are there pics available that have a higher temperature >rating then the normal 85 degrees c? I think most (?) types are available in "extended temp range" -40degC - +125degC. But this is of course perfectly clear from the data sheets, didn't you find anything there ? Don't say you didn't check ! :-) :-) Jan-Erik. -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

ahhh...I remembered reading 'standard' temperature being 85c...and yes I am guilty as charged. Thanks for the help. Regards, Bob "Jan-Erik Soderholm XA (TN/PAC)" <jan-erik.xa.soderholmKILLspamERICSSON.COM> wrote .. {Quote hidden}> Bob Japundza wrote: > >Are there pics available that have a higher temperature > >rating then the normal 85 degrees c? > > > I think most (?) types are available in "extended temp range" > -40degC - +125degC. > > But this is of course perfectly clear from the data sheets, > didn't you find anything there ? > Don't say you didn't check ! :-) :-) > > Jan-Erik. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

For a quick search : - goto http://www.digikey.com - Enter "PIC -E" in the search box (note the space between PIC and -E) - If you like, check the "Items in Stock" checkbox. - Enjoy ! Jan-Erik. PS. Maybe the new parametric search at http://www.microchip.com can do something like this, I havn't checked... -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

> I used pic for automotive for 6 years now high temp ends > With E letter by the way pic can run up to 150 C no problem. > Make sure you do not use WDT. why? Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Wouter, To make ignition module. Andre -----Original Message----- > I used pic for automotive for 6 years now high temp ends > With E letter by the way pic can run up to 150 C no problem. > Make sure you do not use WDT. why? Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I think Wouter meant why not use WDT ? Interested in the reason myself. Rgs Ian. -----Original Message----- From: pic microcontroller discussion list [@spam@PICLISTKILLspamMITVMA.MIT.EDU]On Behalf Of Andre Abelian Sent: Friday, 31 October 2003 3:23 am To: KILLspamPICLISTKILLspamMITVMA.MIT.EDU Subject: Re: [PIC:] high temp pics Wouter, To make ignition module. Andre -----Original Message----- > I used pic for automotive for 6 years now high temp ends > With E letter by the way pic can run up to 150 C no problem. > Make sure you do not use WDT. why? Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

>I think Wouter meant why not use WDT ? Interested in the reason myself. That is what I understood as well, although more specifically why not use it at high temperatures? I suspect that is related to the temperature dependency of the WDT, as others have noted (specifically Jinx, who has done a base calibration of a 16F84 against temperature IIRC). Hence I would suspect that at elevated temperatures the WDT time may get very short, so one would need to clear it more often. Could be a "gotcha when doing ambient bench development without checking at temperature extremes. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

>>> Make sure you do not use WDT. >> why? > To make ignition module. I think I am missing something. Why should you not use the WDT (watchdog) for an ignition module? Will it 'fire' accidentally? :) Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> a base calibration of a 16F84 against temperature IIRC) There's a thought. A lot of new PICs born since then. Might be time to see if anything's changed -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Wouter, WDT has RC based clock witch changes its parameter on Temperature change and reset time changes too. I used PIC WDT to measure temperature worked fine. WDT idea is good but the technology needs to be updated. Andre {Original Message removed}

> WDT has RC based clock witch changes its parameter on > Temperature change and reset time changes too. > I used PIC WDT to measure temperature worked fine. > WDT idea is good but the technology needs to be updated. So the bottom line would be that at high temperartures the watchdog osc run so fast that the watchdog timeout period is impractically short for a certain application? I can understand that, but IMHO it is insufficient motivation for the blunt advice *do not use the watchdog*. Just know the timeout figure and kick the dog often enough. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Wouter, What is IMHO? Andre -----Original Message----- > WDT has RC based clock witch changes its parameter on > Temperature change and reset time changes too. > I used PIC WDT to measure temperature worked fine. > WDT idea is good but the technology needs to be updated. So the bottom line would be that at high temperartures the watchdog osc run so fast that the watchdog timeout period is impractically short for a certain application? I can understand that, but IMHO it is insufficient motivation for the blunt advice *do not use the watchdog*. Just know the timeout figure and kick the dog often enough. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: http://www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spamBeGonelistservspamBeGonemitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email TakeThisOuTlistservEraseMEspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

Andre Abelian wrote: > What is IMHO? In my humble opinion... À mon avis... -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body