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 board.
Features
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Use Maxim DS1307 chip
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Extends CR1220 button cell backup
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Can be operated by a shell
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Set a serial port connector
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Programmable square-wave output signal
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Consumes Less than 500nA in Battery-Backup Mode
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Automatic Power-Fail Detect and Switch Circuitry
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Programmable Square-Wave Output Signal
Please note: a USB to TTL Serial cable is required!
Please also note: Instructions on how to set it up and use with the Raspberry Pi can be found here.
