Arduino Library for using the MCP7941x IC. Only currently supports 24hr clock and doesn't do any validation. The MCP79411 is an I2C RTC chip which also includes 1K of EEPROM, 64 bytes of SRAM and a Unique ID. There are 3 flavours of the MCP7941x, which differ in the Unique ID content: MCP79410 - Blank MCP79411 - EUI-48 Mac Address MCP79412 - EUI-64 Mac Address