Ulf Samuelsson wrote:> Anyone knows of manufacturers of 8 MHz crystals specified for -40'C - > +125'C?try http://global.kyocera.com/application/automotive/product/compo/crystal.html -jg
Crystal solution for full Automotive temp range
Started by ●April 24, 2007
Reply by ●April 25, 20072007-04-25
Reply by ●April 26, 20072007-04-26
"Vladimir Vassilevsky" <antispam_bogus@hotmail.com> wrote in message news:SUOXh.653$uJ6.51@newssvr17.news.prodigy.net...> > > Ulf Samuelsson wrote: > > > > When you have a CAN bus, I suspect you need good accuracy. > > Not really. The tolerance as wide as 1% is good enough.Seems to me that an internal CPU oscillator will not stay tuned withing 1% over the requested temperature range. Typical values are 7.6 to 8.4MHz over -40 to +85 deg. Meindert
Reply by ●April 26, 20072007-04-26
-jg wrote:> Ulf Samuelsson wrote: > >>Anyone knows of manufacturers of 8 MHz crystals specified for -40'C - >>+125'C? > > > try > http://global.kyocera.com/application/automotive/product/compo/crystal.html >When I am looking at a spec sheet from there like this one http://global.kyocera.com/application/automotive/product/compo/pdf/xtal/105_e.pdf I am somehow missing a G-rating. There are automotive applications such as On-Star where automotive electronics have to function for some time after a major crash. The deployment of the airbags isn't necessarily the end of things, electronically speaking. If I'd be in Ulf's situation and it absolutely had to be crystal precision I'd also look at defense suppliers. -- Regards, Joerg http://www.analogconsultants.com
Reply by ●April 26, 20072007-04-26
"Mike Monett" <No@email.adr> wrote in message news:Xns991D7405E990Noemailadr@208.49.80.251...> "TheDoc" <thedoc@future-solar.com> wrote: > > > www.fmi-inc.com > > > 70 to +200 degrees Celsius range. > > Interesting. Their life test is 2,000 hours. That is not long. > > The frequency range is specified at DC to 300MHz. A crystal for DC > will be quite large. > > The temperature limit changes. It is -100C to +250C in > > http://www.frequencymanagement.com/_images/homePage/FMI_ET%20Rev3.pdf > > and -100C to +300C in > > http://www.frequencymanagement.com/FMI_ET%20Mini%20R5.pdf > > Regards, > > Mike Monettin my business, 2000 hours is a long time.. !! i'm happy to get 1000 hours from a tool.. at 200 C LOL.. a crystal for DC.. :)
Reply by ●April 26, 20072007-04-26
On 2007-04-26 16:52, Joerg wrote:> -jg wrote: > >> Ulf Samuelsson wrote: >> >>>Anyone knows of manufacturers of 8 MHz crystals specified for -40'C - >>>+125'C? >> >> >> try >> http://global.kyocera.com/application/automotive/product/compo/crystal.html >> > > When I am looking at a spec sheet from there like this one > > http://global.kyocera.com/application/automotive/product/compo/pdf/xtal/105_e.pdf > > I am somehow missing a G-rating. There are automotive applications such > as On-Star where automotive electronics have to function for some time > after a major crash. The deployment of the airbags isn't necessarily the > end of things, electronically speaking. > > If I'd be in Ulf's situation and it absolutely had to be crystal > precision I'd also look at defense suppliers. >Vectron has some VXCO:s for -55 to +125 degC. e.g. http://www.vectron.com/products/xo/co408.htm (No G-rating stated, what I saw) This one has a G-rating, since it's a mil spec component. http://www.vectron.com/products/military/xo/c1250.pdf
Reply by ●April 26, 20072007-04-26
Rolf Blom wrote:> On 2007-04-26 16:52, Joerg wrote: > >>-jg wrote: >> >> >>>Ulf Samuelsson wrote: >>> >>> >>>>Anyone knows of manufacturers of 8 MHz crystals specified for -40'C - >>>>+125'C? >>> >>> >>>try >>>http://global.kyocera.com/application/automotive/product/compo/crystal.html >>> >> >>When I am looking at a spec sheet from there like this one >> >>http://global.kyocera.com/application/automotive/product/compo/pdf/xtal/105_e.pdf >> >>I am somehow missing a G-rating. There are automotive applications such >>as On-Star where automotive electronics have to function for some time >>after a major crash. The deployment of the airbags isn't necessarily the >>end of things, electronically speaking. >> >>If I'd be in Ulf's situation and it absolutely had to be crystal >>precision I'd also look at defense suppliers. >> > > > Vectron has some VXCO:s for -55 to +125 degC. > > e.g. http://www.vectron.com/products/xo/co408.htm > (No G-rating stated, what I saw) > > This one has a G-rating, since it's a mil spec component. > http://www.vectron.com/products/military/xo/c1250.pdfYep, Mil-Std-202 is what to look for. -- Regards, Joerg http://www.analogconsultants.com
Reply by ●April 26, 20072007-04-26
Meindert Sprang wrote:> "Vladimir Vassilevsky" <antispam_bogus@hotmail.com> wrote in message > news:SUOXh.653$uJ6.51@newssvr17.news.prodigy.net... > > > > > > Ulf Samuelsson wrote: > > > > > > > When you have a CAN bus, I suspect you need good accuracy. > > > > Not really. The tolerance as wide as 1% is good enough. > > Seems to me that an internal CPU oscillator will not stay tuned withing 1% > over the requested temperature range. Typical values are 7.6 to 8.4MHz > over -40 to +85 deg.The LIN bus does an auto-baud transaction, perhaps it is time for the CAN bus devices to offer the same (or similar) feature ? On chip OSC are steadily improving, but some baud-check is a good way to help -jg
Reply by ●April 26, 20072007-04-26
On Thu, 26 Apr 2007 10:54:46 -0500, the renowned "TheDoc" <thedoc@future-solar.com> wrote:> >"Mike Monett" <No@email.adr> wrote in message >news:Xns991D7405E990Noemailadr@208.49.80.251... >> "TheDoc" <thedoc@future-solar.com> wrote: >> >> > www.fmi-inc.com >> >> > 70 to +200 degrees Celsius range. >> >> Interesting. Their life test is 2,000 hours. That is not long. >> >> The frequency range is specified at DC to 300MHz. A crystal for DC >> will be quite large. >> >> The temperature limit changes. It is -100C to +250C in >> >> http://www.frequencymanagement.com/_images/homePage/FMI_ET%20Rev3.pdf >> >> and -100C to +300C in >> >> http://www.frequencymanagement.com/FMI_ET%20Mini%20R5.pdf >> >> Regards, >> >> Mike Monett > >in my business, 2000 hours is a long time.. !! i'm happy to get 1000 hours >from a tool.. at 200 C > >LOL.. a crystal for DC.. :)Size might be an issue. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●April 27, 20072007-04-27
Spehro Pefhany wrote:> On Thu, 26 Apr 2007 10:54:46 -0500, the renowned "TheDoc" > <thedoc@future-solar.com> wrote: > > >>"Mike Monett" <No@email.adr> wrote in message >>news:Xns991D7405E990Noemailadr@208.49.80.251... >> >>> "TheDoc" <thedoc@future-solar.com> wrote: >>> >>> > www.fmi-inc.com >>> >>> > 70 to +200 degrees Celsius range. >>> >>> Interesting. Their life test is 2,000 hours. That is not long. >>> >>> The frequency range is specified at DC to 300MHz. A crystal for DC >>> will be quite large. >>> >>> The temperature limit changes. It is -100C to +250C in >>> >>> http://www.frequencymanagement.com/_images/homePage/FMI_ET%20Rev3.pdf >>> >>> and -100C to +300C in >>> >>> http://www.frequencymanagement.com/FMI_ET%20Mini%20R5.pdf >>> >>> Regards, >>> >>> Mike Monett >> >>in my business, 2000 hours is a long time.. !! i'm happy to get 1000 hours > >>from a tool.. at 200 C > >>LOL.. a crystal for DC.. :) > > > Size might be an issue. >Look at the bright side: In America everything is bigger. Maybe we can build it 8-D -- Regards, Joerg http://www.analogconsultants.com
