Raspberry Pi RTC Expansion Module

The RTC module is specifically designed for Raspberry Pi. It communicated with Raspberry Pi through 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 convenient 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 Programmable Square-Wave Output Signal Port： Raspberry Pi B module 2X13 connection port Raspberry Pi A+/B+/2 module 2X13 connection port 2*5pin 2.54mm connector Product Parameters： Accuracy ±2ppm from 0°C to +40°C Work voltage 5V Battery Backup Input for Continuous Time keeping Real-Time Clock Counts Seconds, Minutes,Hours, Day, Date, Month, and Year with Leap Year Compensation Valid Up to 2100 Work temperature 0°C to +70°C Part List: 1 x RTC Module 1x CR1220 Battery