| 摘要 |
PURPOSE: A data communication system, a controller device, and a data communication method are provided to perform a data communication between the controller device and a data carrier device through merely two contacts. CONSTITUTION: In a controller device(1), when the first transmitting signal is at a "L" level, the first operation voltage is high and the amplitude of signals(CK,ICK) is large, and on the contrary, the amplitude is small when the first transmitting signal is at a "H" level. In a data carrier device(2), the signals(CK,ICK) are subjected to full-wave rectification by a rectifier circuit(21) so as to generate the second operation voltage, and the first receiving signal is extracted from the second operation voltage by the first signal detection circuit(22). On the other hand, in the data carrier device(2), when the second transmitting signal is at a "L" level, impedance between two contacts is small and the amplitude of the signals(CK,ICK) is small, and on the contrary, the amplitude is large when the second transmitting signal is at a "H" level. In the controller device(1), the change of the amplitude of the signal(ICK) is extracted as the second receiving signal by the second signal detection circuit(15).
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