From the Pluxx’s Magitech Golem Parts Emporium blog:
This is a breakout board for the Intersil ISL12022M real-time clock, with optional I²C pull-ups and a CR1225 backup battery. The circuit is based on the design recommended by Intersil, with a few tweaks. It’s the second board I’ve designed so far.
golemparts has shared the project on OSH Park: