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[ARM] RTC Time is Lacking within 15 days by 2 minutes to 8 Minutes

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ThirunavukkarasuThoondi

ThirunavukkarasuThoondi

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Hi
we are using the 32.768 KHz crystal in the PCF8563 RTC circuit. we are using 3.3VDC supply and CR2052 (3V lithium Battery) using BAT54C ORing Diode module. if we measure the frequency at the crystal points we will get the 32.768 KHz . But the Time Lacking is there. Please give some suggesstion to come across the problem.
Thanks
 

Hi,

Possible problems:
* power supply capacitor
* pcb layout
* does the xtal fit to the RTC?
* does the load capacitor fit to the xtal?
* software

Klaus
 

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