Gary W. Schneider - Castle Rock CO, 80104
Drew J. Thwaites - Littleton CO, 80125
A method and system for communicating data between controller and a transponder where the processor is powered by current received from an antenna. The controller is magnetically coupled to the transponder to sense impedance variations in the transponder. The impedance of the transponder is altered by varying current used by a processor within the transponder. The processor current is controlled by varying the processor clock rate.