Abstract: Provided is an NFC tag, including a memory configured to store a message and a key, and a logic circuit configured to receive the message and the key and determine whether each of lengths of the message and the key is an integer multiple of a processing unit, in which, when the length of the message is not m-times the processing unit, the logic circuit generates a correction message including m-processing units by inserting first padding bits into the message so that the length of the message becomes the m-times the processing unit, generates, when the length of the key is not n-times the processing unit, a correction key including n-processing units by inserting second padding bits into the key so that the length of the key becomes the n-times the processing unit, and divides the correction key into a first part and a second part, the processing unit is k bits, each of m and n is a natural number equal to or greater than one, and k is a natural number equal to or greater than two.

Abstract: Provided is a variable 2D barcode generation device. The variable 2D barcode generation device includes an NFC tag configured to store URL information for accessing a webpage and generate an antenna voltage by collecting electromagnetic waves emitted from a portable device, a display device, and a 2D barcode controller configured to read the URL information based on the antenna voltage to generate a 2D barcode mapped to the URL information in real time, and display the 2D barcode on the display device.

Abstract: Provided is a variable 2D barcode generation device. The variable 2D barcode generation device includes an NFC tag configured to store URL information for accessing a webpage and generate an antenna voltage by collecting electromagnetic waves emitted from a portable device, a display device, and a 2D barcode controller configured to read the URL information based on the antenna voltage to generate a 2D barcode mapped to the URL information in real time, and display the 2D barcode on the display device.

Abstract: A near field communication (NFC) device includes a DC power supply configured to output a DC voltage, an NFC interface configured to generate a control signal in response to an NFC signal, and a voltage supply control circuit configured to supply the DC voltage to an electronic circuit in response to the control signal and maintain supply of the DC voltage to the electronic circuit in response to a voltage maintaining signal generated by the electronic circuit powered on by the DC voltage.

Abstract: A near field communication (NFC) device includes a DC power supply configured to output a DC voltage, an NFC interface configured to generate a control signal in response to an NFC signal, and a voltage supply control circuit configured to supply the DC voltage to an electronic circuit in response to the control signal and maintain supply of the DC voltage to the electronic circuit in response to a voltage maintaining signal generated by the electronic circuit powered on by the DC voltage.

Abstract: An integrated circuit includes a bi-directional signal transmission pin connected to a sensing electrode of a salinity sensor, an RF interface which generates operating voltages on the basis of an RF signal received through an antenna, different types of driving signal generators having a structure in which each output terminal is connected to the pin, different types of analog-to-digital converters having a structure in which each input terminal is connected to the pin, and a microcontroller unit which generates a first control signal and a second control signal according to a type of the salinity sensor, in which one of the different types of driving signal generators is enabled based on the first control signal, one of the different types of analog-to-digital converters is enabled based on the second control signal, and the operating voltages are supplied to an enabled signal generator and an enabled analog-to-digital converter.

Abstract: An integrated circuit is disclosed. The integrated circuit includes a UHF RFID tag physical layer that rectifies a UHF RFID signal acquired through a first antenna using a first rectifier to generate a first DC voltage, an NFC tag physical layer that rectifies an NFC signal acquired through a second antenna to generate a second DC voltage, a microcontroller unit, a non-volatile memory that stores data processed and data to be processed by the UHF RFID tag physical layer, and data processed and data to be processed by the NFC tag physical layer under control of the microcontroller unit, and a detector that detects a voltage input of one of the first DC voltage and the second DC voltage, and supplies the detected DC voltage to one of the UHF RFID tag physical layer and the NFC tag physical layer, the microcontroller unit, and the non-volatile memory.