Data carrier
First Claim
Patent Images
1. A data carrier with no battery, comprising:
- a reception coil for receiving an alternating current (AC) magnetic field emitted from at least a host facility providing an AC voltage;
a rectifier circuit for rectifying the AC voltage into a direct current (DC) source voltage;
a wave detector circuit for demodulating communication data superimposed on the AC voltage and for extracting input data;
a modulator circuit for generating reply data for the host facility according to data stored in the data carrier main circuit;
a transmission coil for generating an AC magnetic field according to the reply data;
a data carrier main circuit, includinga MONOS EEPROM for storing the input data,data read means for reading output data from EEPROM,data write means for writing data to the EEPROM;
a control circuit for writing and reading data to and from the EEPROM,a step-up circuit, when enabled, for increasing the source voltage to provide a rewrite voltage; and
a voltage decision circuit for monitoring the source voltage, the voltage decision circuit being operative to enable the step-up circuit in response to a detected predetermined source voltage of a predetermined voltage level.
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Abstract
A data carrier with no battery for reading and writing data transmitted to and from fixed facilities separated from the data carrier by several centimeters, and for rewriting and reading data during use. The data carrier incorporates a MONOS EEPROM, a unit for receiving data from the fixed facilities and writing the data to the EEPROM, and a unit for reading data out of the EEPROM and transmitting the data to the fixed facilities.
109 Citations
27 Claims
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1. A data carrier with no battery, comprising:
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a reception coil for receiving an alternating current (AC) magnetic field emitted from at least a host facility providing an AC voltage; a rectifier circuit for rectifying the AC voltage into a direct current (DC) source voltage; a wave detector circuit for demodulating communication data superimposed on the AC voltage and for extracting input data; a modulator circuit for generating reply data for the host facility according to data stored in the data carrier main circuit; a transmission coil for generating an AC magnetic field according to the reply data; a data carrier main circuit, including a MONOS EEPROM for storing the input data, data read means for reading output data from EEPROM, data write means for writing data to the EEPROM; a control circuit for writing and reading data to and from the EEPROM, a step-up circuit, when enabled, for increasing the source voltage to provide a rewrite voltage; and a voltage decision circuit for monitoring the source voltage, the voltage decision circuit being operative to enable the step-up circuit in response to a detected predetermined source voltage of a predetermined voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A data carrier with no battery, comprising:
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a reception coil for receiving an alternating current (AC) magnetic field emitted from at least a host facility providing an AC voltage; a rectifier circuit for rectifying the received AC voltage into a direct current (DC) source voltage; a wave detector circuit for demodulating communication data superimposed on the received AC voltage and for extracting input data; a data carrier main circuit, including a MONOS EEPROM for storing the input data, data read means for reading output data from EEPROM, data write means for writing data to the EEPROM; a transmission coil for generating an AC magnetic field according to reply data; a modulator circuit for generating the reply data for the host facility according to data stored in the data carrier main circuit; a voltage detector circuit for determining the level of the source voltage provided by the rectifier circuit or the level of a constant voltage produced from the source voltage; switching means controlled by the voltage detector circuit; and first and second circuit blocks connected to and disconnected from each other through the switching means, the first circuit block including the coil, the rectifier circuit, and the voltage detector circuit. - View Dependent Claims (24, 25, 26, 27)
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Specification