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Rtc delay


#1

Hi friends

I am having problem with my USBIZI 144 RTC…

It´s is delaying…

Can you give me a hardware suggestion ?

Thanks

Miguel Wisintainer


#2

How do you know it is delaying? Can you make a test program and steps for us to try?


#3

Have you connected Vbat to 3.3v or connected an external cell…

If you have an extenal cell make sure the voltage is ok (In situ ) this can cause upset…

Cheers Ian


#4

Yes,

I had connected. Looks that is a hardware problem, no software. Power tracks near the crystal or crystal too far the xin xout or capacitors with wrong values or track capacitance :frowning:

I will use a accuracy RTC IC until discover the problem,

Miguel


#5

What is the crystal value you used?


#6

32768Hz


#7

yes this is correct. How much error are you seeing?


#8

too much Gus.

RealTimeClock.SetTime(new DateTime(2010, 10, 28, 10, 52, 45, 0));

and now is in my pc clock

2010/11/02, 13:40

and RTC is registering

2010/11/02 10:48:10

Miguel

PS: i was bad layout that i did…:(, i think…


#9

A ds3231 connected to USBIZI resolved my problem

Miguel