Raspberry Pi RTC Expansion Module v1.1

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 it¡¯s power off. In order to offering a convenient way to debug, there are five pin has been setup which are 5v, 3.3v, Rxd,Txd on borad.FeaturesUse Maxim DS1307 chipExtends CR1220 button cell backupCan be operated by a shellSet a serial port connectorProgrammable square-wave output signalConsumes Less than 500nA in Battery-Backup ModeAutomatic Power-Fail Detect and Switch CircuitryProgrammable Square-Wave Output SignalParametersAccuracy ¡À2ppm from 0¡ãC to +40¡ãCWork voltage 5VBattery Backup Input for Continuous Time keepingReal-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap Year ? Compensation Valid Up to 2100Work temperature 0¡ãC to +70¡ãCDocumentsIt will be appreciated if you can help us improve the documents, add more d