From PICLIST@MITVMA.MIT.EDU Fri Nov 15 06:21:46 2002 Received: from cherry.ease.lsoft.com [209.119.0.109] by dpmail10.doteasy.com with ESMTP (SMTPD32-7.13) id A2FA17640060; Fri, 15 Nov 2002 06:21:46 -0800 Received: from PEAR.EASE.LSOFT.COM (209.119.0.19) by cherry.ease.lsoft.com (LSMTP for Digital Unix v1.1b) with SMTP id <19.007DB777@cherry.ease.lsoft.com>; Fri, 15 Nov 2002 9:07:42 -0500 Received: from MITVMA.MIT.EDU by MITVMA.MIT.EDU (LISTSERV-TCP/IP release 1.8d) with spool id 2703 for PICLIST@MITVMA.MIT.EDU; Fri, 15 Nov 2002 09:07:34 -0500 Received: from MITVMA (NJE origin SMTP@MITVMA) by MITVMA.MIT.EDU (LMail V1.2d/1.8d) with BSMTP id 0047; Fri, 15 Nov 2002 09:06:12 -0500 Received: from pop015.verizon.net [206.46.170.172] by mitvma.mit.edu (IBM VM SMTP Level 320) via TCP with SMTP ; Fri, 15 Nov 2002 09:06:11 EST X-Comment: mitvma.mit.edu: Mail was sent by pop015.verizon.net Received: from djm ([151.199.99.63]) by pop015.verizon.net (InterMail vM.5.01.05.09 201-253-122-126-109-20020611) with ESMTP id <20021115140605.GBYU28019.pop015.verizon.net@djm> for ; Fri, 15 Nov 2002 08:06:05 -0600 References: <001501c28c38$4f5c4720$0a01a8c0@djm> <002601c28c42$6510df90$03eac150@biasbox> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Authentication-Info: Submitted using SMTP AUTH LOGIN at pop015.verizon.net from [151.199.99.63] at Fri, 15 Nov 2002 08:06:04 -0600 Message-ID: <000b01c28cb0$28bb6e20$0a01a8c0@djm> Date: Fri, 15 Nov 2002 09:06:12 -0500 Reply-To: pic microcontroller discussion list Sender: pic microcontroller discussion list From: "Dennis J. Murray" Subject: Re: [PIC]:failed data location? To: PICLIST@MITVMA.MIT.EDU X-RCPT-TO: Status: R X-UIDL: 277600656 X-Evolution-Source: pop://mailinglist%40farcite.net@mail.farcite.net/ X-Evolution: 00000765-0000 You all may be on to something I had not considered - cold failure, although the coldest it got was about in the mid 20's, I wouldn't have thought that would be too cold and result in a consistent failure. The replacement's doing fine, and has survived one nightly temperature in the very low 20's with no problem. I know microchip makes an industrial version that goes down to -40 degrees. I might just buy a handful & replace all 7 of these devices with the extended temperature range version. If, for no other reason than customer satisfaction! Thanks for your input. ----- Original Message ----- From: "Chris Hunter" To: Sent: Thursday, November 14, 2002 8:00 PM Subject: Re: [PIC]:failed data location? > ----- Original Message ----- > From: "Dennis J. Murray" > To: > Sent: Thursday, November 14, 2002 11:48 PM > Subject: Re: [PIC]:failed data location? > > //snip// > > > If it IS hardware, Paul Hutchinson is > > probably closest to the solution. He indicated the chip may have failed > > because of cold. I'm reluctant to believe that yet - I don't know if > chips > > would permanently fail on cold, as they would do when they get too hot > (i.e. > > thermal runaway). > > I have had semiconductors fail in particularly cold environments, but never > down to individual memory cells - I had some high power FETs that had the > internal wires fracture through thermal shock. > > Chris > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.