Post by thread:[EE]:DS1302 RTC Crystal

I have Problem DS1302 crystal ; it is Run faster approximately 5 seconds a day, I tryed 5 different brand 32768 Hz. Crystal but didn't solve my problem . If you know anything about please help me .. Best regards, -- 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

Nihat DAGDEMIR wrote: > > I have Problem DS1302 crystal ; it is Run faster approximately 5 seconds a > day, > I tryed 5 different brand 32768 Hz. Crystal but didn't solve my problem . > If you know anything about please help me .. The 1302 needs a 6pf load capacitance crystal. Most stores wouldn't know what this means, and you could end up with anything. Get the PDF Data from http://www.dalsemi.com/datasheets/pdfindex.html But even so, I have found that these dallas RTC's aren't all that accurate. perhaps 5 seconds a week maybe. Don McKenzie spam_OUTdonTakeThisOuTdontronics.com http://www.dontronics.com The World's Largest Range of Atmel/AVR & PICmicro Hardware and Software Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html The Little "rAVeR!" AVR & Basic Kit http://www.dontronics.com/dt006.html -- 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

Just a thought but have you tried adding variable capacitance to try to trim it in. I don't know what the correct load caps are (if any), but I believe the one on the input end is sometimes made variable. {Original Message removed}