I2C RTC DS1307 High Precision RTC Module Real Time Clock Module for Raspberry Pi 3

Specifications

Uses DS1307 chip;
CR1220 battery for situations where the module no longer feeds, so it keeps the countless regardless of the situation with consumption below 500nA;
Real time clock (RTC) that has the ability to record seconds, minutes, hours, days, weeks, months and years, including bisect year up to 2100;
You can set a serial port connector;
Automatically detects drops and interruptions of voltage;
Working temperature: 0 ° C - + 70 ° C;
Power supply: 5V;
Dimensions: 26 x 22.5 mm

Applications

The intelligent house;
Utility meter;
Telemetry;

Wiring

Tutorial & Code

https://www.dfrobot.com/wiki/index.php/Raspberry_Pi_RTC_Module_SKU:_DFR0386

Datasheet

https://raw.githubusercontent.com/DFRobot/DFR0368/master/DFR0386%2052PI-RPI-RTC-BAT%20datasheet.pdf