Patent ID: 7423517

Claim:
An integrated circuit for use in a transponder for non-contacting communication with a communication station, the integrated circuit comprising: circuit connecting contacts connected to transmission means of the transponder to pick off an input voltage; control means to generate a control signal as a function of an operating mode of the transponder, wherein the control means is configured to generate: a first control signal as a function of a read mode of the transponder; a second control signal as a function of a write mode of the transponder; and a third control signal as a function of a transponder-talks-first mode of the transponder; a monitoring circuit to receive the control signal from the control means and a voltage based on the input voltage, the monitoring circuit to generate a signalizing signal based on a relationship between a voltage threshold value and the voltage, wherein the voltage threshold value corresponds to the control signal, the voltage threshold value comprising one of a plurality of preset voltage threshold values, the plurality of preset voltage threshold values comprising: a first voltage threshold value corresponding to the read mode of the transponder; a second voltage threshold value corresponding to the write mode of the transponder, wherein the second voltage threshold value is higher than the first voltage threshold value; and a third voltage threshold value corresponding to the transponder-talks-first mode of the transponder, wherein the third voltage threshold value is lower than the first voltage threshold value; and a data-processing circuit to receive the signalizing signal from the monitoring circuit.