Patent ID: 8803592
Filing Date: 2014-08-12
Classification: G06K,H03K

Abstract:
1. A data persistence control apparatus for an RFID tag, the apparatus comprising: a capacitor for storing electrical energy that retains a preset value when the RFID tag is powered on; a charge circuit for charging the capacitor; a discharge circuit for discharging the capacitor; a switch for electrically connecting either the charge circuit or the discharge circuit to the capacitor when the switch is in an on state; an output circuit for outputting a logic high signal or a logic low signal according to an input voltage that is determined based on a degree of discharge of the capacitor; and a control circuit for controlling the charge circuit, the discharge circuit and the switch by receiving an input signal and an enable signal, the control circuit comprising a first NOT gate for receiving the input signal; a buffer for receiving the enable signal; a first NAND gate that has a first input terminal connected to an output terminal of the first NOT gate and a second input terminal connected to an output terminal of the buffer; a second NAND gate that has a first input terminal connected to the output terminal of the buffer, a second input terminal connected to an input terminal of the first NOT gate and an output terminal connected to the charge circuit; and a second NOT gate that has an input terminal connected to the output terminal of the first NAND gate and an output terminal connected to the discharge circuit.