The RTC module is specifically designed for Raspberry Pi. It communicated with Raspberry Pi through the I2C bus. There is a Maxim DS1307 and CR1220 button cell on the board to keep the real-time for a long time after the Raspberry Pi has its power down. Set a serial port, TTL conveniently way online debugging.
Features:
Use Maxim DS1307 chip
Extends CR1220 button cell backup
Can be operated by a shell
Set a serial port connector
Programmable square-wave output signal
Consumes Less than 500nA in Battery-Backup Mode
Automatic Power-Fail Detect and Switch Circuitry
Accuracy ±2ppm from 0°C to +40°C
Work voltage 5V
Battery Backup Input for Continuous Timekeeping
Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100
