Method for generating power supply interruption time information in a contactless data carrier

A method of determining disconnection time information which is significant for a disconnection period in which disconnection period an integrated circuit of a data carrier designed for contactless communication with a communication partner device has not been adequately supplied with power by a power supply field, the method comprising:

• charging at least one first storage capacitor of the integrated circuit while the integrated circuit is being adequately supplied with power;
• discharging the at least one first storage capacitor from a first starting time when the integrated circuit is subsequently no longer adequately supplied with power;
• determining the disconnection time information on the basis of the discharge behavior, which is affected by the IC material and by radiation, of the at least one first storage capacitor;
• and correcting the determined disconnection time information in dependence on the effects of at least one of the IC material and at least one radiation effect, and on the basis of the discharge behavior of the at least one first storage capacitor, wherein the first storage capacitor is charged from a second starting time following the first starting time from which second starting time an adequate supply is re-established, and wherein the first storage capacitor is discharged from a third starting time following the second starting time and wherein the discharge voltage of the first storage capacitor present at the second starting time is compared to the discharge voltage of the first storage capacitor present at the determination time following the third starting time and wherein the disconnection time information is determined in dependence on a result of the comparison.

An integrated circuit of a data carrier designed for contactless communication with a communication partner device, comprising:

• a first charging circuit for charging at least one first storage capacitor of the integrated circuit while the integrated circuit is being adequately supplied by a power supply field;
• a first discharge circuit for discharging the first storage capacitor following a first starting time when the integrated circuit is no longer adequately supplied with power, the discharge behavior of the at least one storage capacitor being affected by the IC material and by at least one radiation effect;
• determination logic circuitry for determining disconnection time information which is significant for a disconnection period in which disconnection period the integrated circuit has not been adequately supplied with power, the disconnection time information being determined on the basis of the discharge behavior of the at least one first storage capacitor so that the disconnection time information is available from a determination time;
• and correction logic circuitry for the correction of the determined disconnection time information in dependence on the effects of at least one of the IC material and the at least one radiation effect, and on the basis of the discharge behavior of the at least one first storage capacitor and on at least one of the discharge behavior of a second storage capacitor of the integrated circuit and a temperature indication of the integrated circuit, wherein a renewed charging of the at least one first storage capacitor is prevented with the aid of the determination logic circuitry from a second starting time following the first starting time, from which second starting time an adequate supply is re-established, to a determination time, and wherein a second charging circuit is provided for charging the second storage capacitor from the second starting time and wherein a second discharge circuit is provided for discharging the second storage capacitor from a third starting time following the second starting time wherein the discharge behavior of the second storage capacitor is affected by the IC material and by the at least one radiation effect, and wherein the determination logic circuitry is designed for comparing the discharge voltage of the at least one first storage capacitor to the discharge voltage of the second storage capacitor at the determination time following the third starting time and for determining the disconnection time information in dependence on a result of the comparison.

An integrated circuit of a data carrier designed for contactless communication with a communication partner device, comprising:

• a first charging circuit for charging at least one first storage capacitor of the integrated circuit while the integrated circuit is being adequately supplied by a power supply field;
• a first discharge circuit for discharging the first storage capacitor following a first starting time when the integrated circuit is no longer adequately supplied with power, the discharge behavior of the at least one storage capacitor being affected by the IC material and by at least one radiation effect;
• determination logic circuitry for determining disconnection time information which is significant for a disconnection period in which disconnection period the integrated circuit has not been adequately supplied with power, the disconnection time information being determined on the basis of the discharge behavior of the at least one first storage capacitor so that the disconnection time information is available from a determination time;
• and correction logic circuitry for the correction of the determined disconnection time information in dependence on the effects of at least one of the IC material and the at least one radiation effect, and on the basis of the discharge behavior of the at least one first storage capacitor and on at least one of the discharge behavior of a second storage capacitor of the integrated circuit and a temperature indication of the integrated circuit, wherein a renewed charging of the at least one first storage capacitor can be started with the aid of the determination logic circuitry from a second starting time following the first starting time from which second starting time an adequate supply is re-established, and wherein the first discharge circuit is provided for discharging the first storage capacitor from a third starting time following the second starting time wherein the determination logic circuitry is designed for comparing the discharge voltage of the first storage capacitor present at the second starting time to the discharge voltage of the first storage capacitor present at the determination time following the third starting time and for determining the disconnection time information in dependence on a result of the comparison.

A circuit for determining disconnection time information for a disconnection period in which disconnection period an integrated circuit of a data carrier designed for contactless communication with a communication partner device has not been adequately supplied with power, the circuit comprising:

• at least one first storage capacitor arranged in the integrated circuit for discharging from a first starting time when the integrated circuit is subsequently no longer adequately supplied with power,
• a second storage capacitor arranged in the integrated circuit for discharging from a second starting time that is after the first starting time,
• a first charge circuit arranged to charge the at least one first storage capacitor while the integrated circuit is being adequately supplied with power,
• a logic circuit configured and arranged for
• determining the disconnection time information on the basis of the discharge behavior of the second storage capacitor, and the discharge behavior, which is affected by the IC material and by radiation, of the at least one first storage capacitor, and
• correcting the determined disconnection time information in dependence on the effects of at least one of the IC material and at least one radiation effect.

A circuit for determining disconnection time information for a disconnection period in which disconnection period an integrated circuit of a data carrier designed for contactless communication with a communication partner device has not been adequately supplied with power, the circuit comprising:

• at least one first storage capacitor arranged in the integrated circuit for discharging from a first starting time when the integrated circuit is subsequently no longer adequately supplied with power,
• a second storage capacitor arranged in the integrated circuit for discharging from a second starting time corresponding to the integrated circuit being supplied with adequate power subsequent to the first starting time,
• a first charge circuit arranged to charge the at least one first storage capacitor while the integrated circuit is being adequately supplied with power,
• a logic circuit configured and arranged for
• determining the disconnection time information on the basis of the discharge behavior, which is affected by the IC material and by radiation, of the at least one first storage capacitor and on the basis of the discharge behavior of the second storage capacitor, and
• correcting the determined disconnection time information in dependence on the effects of at least one of the IC material and at least one radiation effect, and on the basis of a temperature indication of the integrated circuit.