I am currently working on a project which requires an RTC module to be run off a super capacitor rather than a battery for the olimex board. Is their a module out their on the market that would be suitable? Or could the RTC module provided by olimex be modified to include super capacitor. If yes, how?
Looking at the schematic
https://www.olimex.com/Products/Modules/Time/MOD-RTC/resources/MOD-RTC-REV-A-SCHEMATIC.pdf
I would say replace the battery with your capacitor, and put a resistor in series with a low drop diode between the plus from the capacitor and pen 1 from UEXT connector to limit the current for loading, maybe 27 ohm would be a good value