Keeping RTC running during power down

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DaHu_285096
Level 5
Level 5
10 likes received 250 replies posted 100 replies posted

 Is there a Bat pin that can be sued to supply power just to keep the RTC running when main power to the application is removed?

   

I notice a VBAT used with the Boost circuit but not sure if this is relevant.

   

I would assume there must be provision for this because it would seem wasteful to use an external RTC when one is on board.

   

I have lookied through some forums and will do some searches in the meantime.

   

Thanks

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2 Replies
Bob_Marlowe
Level 10
Level 10
First like given 50 questions asked 10 questions asked

No need to ask twice  answer stays the same.

   

RTC does not run at power down and cannot be buffered. Use external RTC.

   

 

   

Bob

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ETRO_SSN583
Level 9
Level 9
250 likes received 100 sign-ins 5 likes given

You can use RTC as wakeup in sleep mode -

   

 

   

    

   

          

   

http://www.cypress.com/?app=forum&id=2232&rID=89607

   

 

   

http://www.cypress.com/?rID=64554

   

 

   

 

   

Regards, Dana.

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