This RTC module is specifically designed for the Raspberry Pi. It communicates with Raspberry Pi through I2C bus and includes a Maxim DS1307 and CR1220 button cell on the board to keep a real time clock for a long time after the Pi has powered down. Just set a serial port, and you have a convenient way of online debugging using TTL. Supports Raspberry Pi B/A+/B+/2 model B/3 model B.
RTC module: DS1307
Battery model: CR1220 button cell
Operting Voltage: 5V
I2C address: 0x68
Clock precision: ±2ppm (0~40°C)
Unit information: Second, Minute, Date, Week, Month and Year
Operating temperature: -10°C至+85°C
Compatible with Raspberry Pi B/A+/B+/2 model B/3 model B
Interface: 2*5p 2.54mm
This product and description is from DFRobot.