Extend and Isolate the I~2C Bus

摘要

When you have a multiple-board application-such as a growing robotics design-you can use the I~2C bus to move data while keeping the wiring simple. This review of the I~2C communication protocol shows why the uncomplicated architecture can make a complex project a little easier.rnWhen you use the PC bus as it was originally intended, it simplifies hardware integration with circuit simplicity. This simple two-wire bidirectional highway ties together the standard function components using the now "iconic" PC interface. Original standard components included memory, ADCs, DACs, LCD drivers, I/O ports, and clock/calendar timekeepers. This list has grown with the addition of LED drivers, DIP switches, temperature sensors, and voltage sensors. However, because every microcontroller on the market has either hardware PC support or can be bit-banged into PC submission, the list becomes essentially endless thanks to the virtual component. Circuit Cellar columnist Robert Lacoste's universal PC driven user interface controller (PC-MMI) design project is an example.