The RTC Plug is a small board containing a DS1340 real-time clock with battery backup, so that it continues to track the time when the power is switched off.
Note: this plug was initially called a "Clock Plug". The text on the above boards hasn't been adjusted yet.
An I2C bus running at 3.3V is used for I/O, with all the power and signal lines brought out to to both sides of the board to allow daisy-chaining with other I2C-conformant boards.
For additional details, see http://news.jeelabs.org/2009/10/05/clock-fixed/
Configuration
There is nothing to configure. The RTC chip on this plug responds to I2C address 0x68.
Header Pinouts
Design Info
Dimensions: 21.1 x 31.8 mm
CadSoft EAGLE design files: jlpcb-024.pdf / jlpcb-024.sch / jlpcb-024.brd.
This plug can be operated at 5V as well as 3.3V.
This board uses the conventions of a JeePlug and can be used with the ports on a JeeNode. It can also be used with other boards and MCU's, if you hook it up properly and adapt the interface code for it.