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MSP430F5338: RTC working time when powered using Super Capacitor only

Part Number: MSP430F5338

Hi,.

  We are designing a system in which MSP430F5338 is used.

  For powering the RTC in the MSP430 during shutdown, we have used a 3.5V 0.22uF super capacitor connected to VBAT.

  The question is that, how long will the super cap alone be able to supply power for RTC to work?

  Or, how can we determine the duration for the which the RTC is working with super cap alone connected?

 Thank you.