How can real time clock keep track of clock after power down?

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hustyw

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who knows how can real time clock keep track of clock after power down ,what's the relation between RTC and clock unit?
 

Re: how does RTC work?

RTCs usually have backup batteries which allow them to run internal time keeping circuitry for years .. see picture below ..
More details at:
https://www.acmesystems.it/?id=105

Regards,
IanP
 

Re: how does RTC work?

Hi

here is the link where you can have some idea
here is the schematic and overall
it shows how it is interfaced to a microcontroller

h**p://www.sages.com.au/Contest99/SSAU0002.pdf#search=%22PCF8583%20schematic%20with%20battery%20source%22
 

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