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Re: core temperature of the processor? (Mysil)
Hi, edisonc Seem to me you want Microchip or forum members to give you some magic formula to remove heat, without you having to change anything. You have clearly enough indicated that there is a...
View ArticleRe: core temperature of the processor? (Alpha Whisky)
2. Absolutely, you can't put a scope probe directly onto the oscillator pins, it tells you nothing. I would use either the capture/compare module or enhanced capture/compare module in compare mode to...
View ArticleRe: core temperature of the processor? (future56k)
Did you heat up the PIC and saw it halting?
View ArticleRe: core temperature of the processor? (edisonc)
We love Microchip products, that is why we picked Microchip MC to make our products. We invested in a few different Microchip compilers, debuggers, real ICEs, and programmers. However, when our...
View ArticleRe: core temperature of the processor? (edisonc)
We think Alpha Whiskey's crystal consideration might be helpful, because customers reported first thing lost during heat was Ethernet, then I/O pins. In our tests, we knew if frequency shifted,...
View ArticleRe: core temperature of the processor? (ric)
edisonc..Is there any easy way for testing the crystal frequency or monitoring the crystal on board, since it is not easy to use probe, so that we can test them under temperature change?Alpha Whiskey...
View ArticleRe: core temperature of the processor? (edisonc)
Ethernet interface must be up all the time, because it is reporting to servers and taking commands from servers all the time over that interface. Users run this board all years long. But this year is...
View ArticleRe: core temperature of the processor? (Ian.M)
Re: temperature related crystal problems QA testing for existing boards would involve a bed of nails tester with a low capacitance active probe in an environment chamber. Big $$$$$ Failure analysis...
View ArticleRe: core temperature of the processor? (NKurzman)
"Microchip employs a highly trained staff of field Application Engineers (FAE), Corporate Application Engineers (CAE), and technical consultants. To provide customers with the most efficient technical...
View ArticleRe: core temperature of the processor? (roundrocktom)
Feedback from Microchip: Part is fully qualified and tested to operate at -40C to +85C Ambient. Tj MAX of 125C. Part is be fully functional at 85C Ambient.Since Theta JA = 48.3 C/W and Theta JC =...
View ArticleRe: core temperature of the processor? (cts_casemod)
I had a similar problem with a DSPIC in a previous project. Needed industrial temperature and the device was getting quite hot. Not only that the SMT linear regulator feeding it was also getting warm...
View ArticleRe: core temperature of the processor? (drh)
edisoncHi Alpha Whiskey, 1. All Vss and Vdd pins are soldered to the PCB and connected to the power and ground. The thermal problem is not caused by PCB layout. The capacitors are all on the PCB,...
View ArticleRe: core temperature of the processor? (JANickerson)
I had a PIC32MX board that quit with temp problems when summer came.It turned out a poorly sized self resettable fuse was to blame.I did discover that the BOR did not fire as it is using the internal...
View ArticleRe: core temperature of the processor? (roundrocktom)
EdisonC -- please enable your PM's. Most likely the assembly house made a huge mistake. It would appear you specified the board at the correct 2.26K RBIAS. I assumed they didn't have that value,...
View ArticleRe: core temperature of the processor? (ric)
roundrocktom...Most likely the assembly house made a huge mistake. It would appear you specified the board at the correct 2.26K RBIAS. I assumed they didn't have that value, and with faulty math,...
View ArticleRe: core temperature of the processor? (DEKTRON)
A few practical suggestions- 1) Apparently, you have one customer in the field saying that it locks up at +55C ambient, but did you test a few sample products, heat them to 60C and see if they lock up...
View ArticleRe: core temperature of the processor? (roundrocktom)
ricHow did you work out all this? Did you get to see one of his boards? Yes, I was able to obtain one of his boards. Took a while, but out of respect to EdisonC, I will not post any photo's without...
View ArticleRe: core temperature of the processor? (roundrocktom)
Quick update on testing the board: With the incorrect RBIAS of 1564 ohm, the board consumed 0.21 Amp - PIC18F67J60 was running at 60C on the case (Ambient was 28C). Once the RBIAS was replaced with...
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Re: core temperature of the processor? (ric)
An excellent tool for locating hot spots on a board is one of those hand-held infra-red thermometers.e.g. http://www.jaycar.com.au/productView.asp?ID=QM7215
View ArticleRe: core temperature of the processor? (ric)
edisonc, could you provide us with some closure here, and confirm if the suggestions from roundrocktom fixed your problem?It sounds like Tom did some excellent detective work for you. :)
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