If you're using an Arduino, this goes nicely with Constantin Koch's RV-3038-C7-Arduino_Library, which you can download direcly from the Arduino Library Manager.
Dimensions: 18.8mm x 22.6mm.
- U1: RV-3028-C7 RTC
- C1: 0.1µ 0603
- C2: 0.1µ 0603
- R1: 10k 0603 (Do Not Populate; see datasheet for details.)
- R2: 10k 0603
- R3: 1k 0603
- R4: 10k 0603
- R5: 10k 0603
- R6: 10k 0603
- BT1: MS621F battery
- J1: Conn 1x4 female, 2.54mm
- J2: Conn 1x4 female, 2.54mm