Method for generating power supply interruption time information in a contactless data carrier
AssigneeKoninklijke Philips Electronics N.V.
InventorsFranz Amtmann, Hubert Watzinger, Roland Brandl, Ewald Bergler
Life of this patent
Estimating the term…
Abstract
In a method for the determination of disconnection time information (DTI) significant for an inadequate power supply of an integrated circuit (2) of a data carrier (1) such as an RFID-tag. The disconnection time information (DTI) is determined on the basis of the discharge behavior of a first storage capacitor (C1), which is affected by the IC material and by radiation, and the determined disconnection time information (DTI) is corrected in dependence on the effects of the IC material and/or on at least one radiation effect.
Claims10
A method of determinating a 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 means of a power supply field, wherein at least one first storage capacitor of the integrated circuit is charged while the integrated circuit is being adequately supplied, and wherein the at least one first storage capacitor is discharged from a first starting time when the integrated circuit is subsequently no longer adequately supplied, and wherein the disconnection time information is determined 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 wherein the determined disconnection time information is corrected in dependence on the effects of the IC material and/or on at least one radiation effect.
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 means of a power supply field, and comprising a first discharge circuit for discharging the first storage capacitor following a no longer adequate supply of the integrated circuit from a first starting time wherein the discharge behavior of the at least one storage capacitor is affected by the IC material and by at least one radiation effect, and comprising determination means for determinating a disconnection time information which is significant for a disconnection period in which disconnection period an 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 which is affected by the IC material and by at least one radiation effect, so that the disconnection time information is available from a determination time (t4), and comprising correction means for the correction of the determined disconnection time information in dependence on the effects of the IC material and/or the at least one radiation effect.
Dependencies are inferred from the claim text.