The UART Plug adds a serial port, connected via I2C. It is based on the SC16IS740 chip.
This serial port has 64-byte buffers for both send and receive, and can support accurate baudrates up to 230400 baud, though this will probably tax the I2C bus through which it is being used.
For additional details, see http://jeelabs.org/2009/10/04/more-serial-ports/
There are two solder jumpers to configure each plug for one of the following 7-bit I2C addresses:
More addresses are possible by wiring these jumpers to the SCL and SDA signals.
h. Header Pinouts
Dimensions: 21.1 x 24.1 mm
CadSoft EAGLE design files: see below.
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.