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TPS65217D - Recommended Batteries for RTC Backup?

Other Parts Discussed in Thread: TPS65217

A customer of mine is using the TPS65217D and would like to have the RTC preserved for 1 year using a coin cell battery.

With that in mind I have the following questions:

1. What is the current draw for keeping the RTC ticking when only the coin cell power is connected?

2. Does TI have any recommended coin cell battery solutions for this application?

Thanks,

Adam