PASSIVE CONTACTLESS INTEGRATED CIRCUIT COMPRISING A FLAG FOR MONITORING AN ERASE/PROGRAMMING VOLTAGE
First Claim
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1. A passive contactless integrated circuit, comprising:
- an electrically programmable non-volatile data memory;
a charge accumulation booster circuit to supply a high voltage sufficient to write data in the memory;
a volatile memory point to memorize an indicator flag; and
means for modifying the indicator flag when the high voltage reaches a threshold for a first time after activating the booster circuit.
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Abstract
A passive contactless integrated circuit includes an electrically programmable non-volatile data memory (MEM), a charge accumulation booster circuit for supplying a high voltage necessary for writing data in the memory. The integrated circuit includes a volatile memory point for memorizing an indicator flag, and circuitry for modifying the value of the indicator flag when the high voltage reaches a critical threshold for the first time after activating the booster circuit.
16 Citations
31 Claims
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1. A passive contactless integrated circuit, comprising:
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an electrically programmable non-volatile data memory; a charge accumulation booster circuit to supply a high voltage sufficient to write data in the memory; a volatile memory point to memorize an indicator flag; and means for modifying the indicator flag when the high voltage reaches a threshold for a first time after activating the booster circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A portable electronic object, comprising:
a portable support and an integrated circuit mounted onto the portable support or integrated into the portable support, the integrated circuit including; an electrically programmable non-volatile data memory; a charge accumulation booster circuit coupled to said memory to supply a high voltage sufficient to write data in the memory; a volatile memory point to memorize an indicator flag; and circuitry to modify the indicator flag when the high voltage reaches a threshold for a first time after activation of the booster circuit. - View Dependent Claims (16, 17, 18, 19, 25, 26)
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20. A method for writing a datum in an electrically programmable non-volatile memory of a passive contactless integrated circuit, the method comprising:
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initializing an indicator flag in a volatile memory point of the integrated circuit; activating a charge accumulation booster circuit supplying a high voltage sufficient to write the datum in the memory; and changing the indicator flag when the high voltage reaches a threshold for a first time after activating the booster circuit. - View Dependent Claims (21, 22, 23, 24)
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27. A method for managing data write sequences in a passive contactless integrated circuit, the method comprising:
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producing a boosted write voltage; detecting whether the write voltage exceeds a threshold level sufficient to write data in an electrically programmable nonvolatile data memory; and providing an error signal in response to determining that the write voltage does not exceed a threshold level. - View Dependent Claims (28, 29, 30, 31)
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Specification