I am trying to work out the current draw from Vbackup when the RTC is kept alive but the rest of the system is shutdown. I am trying to determine the size of the backup cell that I need for my application.
I am working with the GUM3703 device
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1\$\begingroup\$ You need to provide links to the manufacturer's datasheet for the GUM3703 and for the RTC device. \$\endgroup\$– Elliot AldersonCommented Apr 9, 2020 at 17:04
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1 Answer
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On the Overo Waterstorm (GUM3703W), "VBACKUP" is connected to pin M14 on the TPS65950 (http://www.ti.com/lit/ds/symlink/tps65950.pdf). Table 5-22 provides the typical power consumption for the use case where no main power source is connected: 
Note that 3.2V is used as the typical backup battery supply voltage for this calculation (see page 19 of the datasheet):
Hope this helps!
