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A breakout board for the Microchip MCP79411 or MCP79412 Real-Time Clock/Calendar. The boards are hand-assembled in batches based on demand; if they are out of stock, backorders are accepted.
The Microchip MCP7941x RTCs offer several advantages over other low-cost real-time clocks. Among these are on-chip calibration, dual alarms, power fail/restore timestamps, IEEE 48- or 64-bit Extended Unique Identifier (EUI-48 or EUI-64), 128 bytes EEPROM, 64 bytes battery-backed SRAM, 1.8-5.5V supply voltage and I2C clock frequency to 400kHz. Please see my blog post for additional information.
Boards are shipped calibrated and running (set to UTC) with a fresh CR2016 lithium cell installed. Included documentation gives the RTC EUI ID and calibration register setting. Headers are provided but not soldered to the board to allow flexibility in connection.
I wrote an Arduino library to support the MCP7941x, which is available on GitHub. (For other applications, the MCP7941x uses a standard I2C interface.)
The only difference between the MCP79411 and MCP79412 is that the '11 is pre-programmed with an EUI-48 identifier while the '12 is pre-programmed with an EUI-64 ID. EUI-48 can be used as an Ethernet, WiFi or Bluetooth MAC address. The EUI-64 format is appropriate for ZigBee, IEEE 805.15.4, IPv6 or FireWire. Additionally, EUI-48 IDs can be converted to EUI-64; the library above has a function to do this.
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I'm a retired electrical engineer that somehow spent a career in IT. Now having loads of fun with microcontrollers!