This SparkFun Real Time Clock (RTC) Module is a Qwiic-enabled breakout board for the RV-1805 chipset. The RTC is ultra-low power (running at only about 22nA in its lowest power setting) so it can use a supercapacitor for backup power instead of a normal battery. This means you get plenty of charge and discharge cycles without any degradation to the battery.” To make it even easier to get your readings, all communication is enacted exclusively via I2C, utilizing our handy Qwiic system so no soldering is required to connect it to the rest of your system. However, we still have broken out 0.1″-spaced pins in case you prefer to use a breadboard.
Key Features

Operating Voltage (Startup): 1.6V – 3.6V

Operating Voltage (Timekeeping): 1.5V – 3.6V

Operating Temperature: -40C – 85C

Time Accuracy: +-2.0 ppm

Current Consumption: 22nA (Typ.)

I2C Address: 0xD2

Supercapacitor for Backup Power

2x Internal Oscillators

2x Qwiic Connectors

STEMMA QT / Qwiic 4-pin 1mm Pitch White Female Connector Cable 150mm Long – Both Sidecan be purchased seperately.
Resources

Schematic

Eagle Files

Hookup Guide

Datasheet(RV-1805)

Datasheet(DSK-414)

Application Manual(RV-1805)

Qwiic Page

Arduino Library

GitHub