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For PCF8523, how to calculate backup time when supercap is 0.22F?

Question asked by maxx cheng on Mar 17, 2017
Latest reply on Mar 23, 2017 by maxx cheng

For PCF8523, how to calculate backup time when supercap is 0.22F?
I've checked UM10301.pfd, there is a formula to calcuate it, but I don't know 

what Vcbackupend is?

 

Please help to point it out? 1.8v or 1v....

 

 

Using C·V = I·t: C⋅(V ) − V Cbackupstart Cbackupend   = t backup I RTC 

 

Regards,

Maxx

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