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battery connection for inbuilt rtc PIC microcontroller

 
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td



Joined: 16 Apr 2015
Posts: 21
Location: India

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battery connection for inbuilt rtc PIC microcontroller
PostPosted: Wed Apr 22, 2015 3:02 am     Reply with quote

hi,
In our project we are using PIC controller with inbuilt rtc. I have connected 32khz crystal. But I don’t know where to connect external battery for rtc backup. Can anyone help me to find out the pin of microcontroller for rtc battery?
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Wed Apr 22, 2015 3:23 am     Reply with quote

There isn't one.

To run the PIC's RTC, you have to power the PIC.

What you can do, is put the PIC itself to sleep (selecting the right options to keep the RTC running), and then the PIC will stop running, and the RTC stay alive, and power consumption plummets.

If your main supply is not itself battery backed, then you'll need to add the circuitry to maintain the supply just to the PIC from the battery.
td



Joined: 16 Apr 2015
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Location: India

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PostPosted: Wed Apr 22, 2015 3:36 am     Reply with quote

thank you....

that means PIC should be on continuously for that. so it is better to use external rtc with battery.
Ttelmah



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PostPosted: Wed Apr 22, 2015 3:47 am     Reply with quote

It's simpler, yes.

However a sleeping PIC, running just the RTC, typically draws perhaps 2uA.
td



Joined: 16 Apr 2015
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PostPosted: Wed Apr 22, 2015 3:51 am     Reply with quote

okay.

thank you very much
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