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RTC: Detect Low batt posible ?

Question asked by rubth on Mar 7, 2012
Latest reply on Mar 9, 2012 by PGaganoff

Hello

 

We work with Blackfin BF537. We used the RTC with a extern Batterie for the RTC. The system ist powered at power line, but not 24h per day..

For a long batterie life, we have 2 diodes, for the RTC Vdd. If the system is power on, the RTC will power from the normaly power, and the batteri have no function.

I search for a posibility, to detect, if the batterie is low. I dont found a flag or bit, for detect this situation.

 

can everybody give me a idea ??

 

Thomas

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