The structure and function of the IC card is introduced

Smart card RFID mainly consists of antenna, RF interface, micro control unit. Eachpart of module and its functions include the following:

Antenna: used to receive RFID reader signal transmission, and the datainformation is sent back to the RFID reader.

The RF interface circuit: mainly comprises a waveform converter, modulation / demodulation device, rectifier, voltage regulator, oscillator. Waveform converterreceives the read and write radio modulation signal device on the one hand,sending modulation / demodulation module, on the other hand, waveformconversion, the sine wave is converted to Fang Bo, and then on the rectifier filter,consists of a voltage regulating module for further processing such as voltage regulator, voltage, the final output supply card for each work circuit. The oscillator generates modulation / demodulation for high frequency signal and the clock signal of micro control unit.

The micro control unit: the realization of recognition and execution of the smart card reader instruction. Including the logic control unit, request response unit,collision prevention unit, data encryption unit, storage unit (including E2PROM and ROM) etc..

Request response unit: when a RFID smart card in reader antenna working range,the reader to the RFID smart card issued a command, request response unit will be initiated, will be transferred to the card smart card reader, the first step to establish a communication smart card and reader contact. Otherwise, the reader to read theother smart card write operation will not be.

Data encryption unit: complete encrypted and password protected data.

The storage unit: including E2PROM and ROM, mainly used for the storage of data, user data to be stored (Readers' personal information, such as name,profession, hobby, borrowing and returning books records, can also store personal account) is stored in the unit. The data in the E2PROM in the smart card, smart card lost power after leaving the read write device effective working range of antennas will still be maintained.

Anti collision unit: when there are multiple RFID smart card into the reader operating range, anti collision unit will be selected from among a operation, the unchecked is in idle mode to wait for the next card selection, the process returns asequence number is chosen card.

The logic control unit: used for signal decoding RFID reader sent, and according to the requirements of the return data to RFID reader.

IC card read-write principle

Electromagnetic wave RFID reader to launch a set of fixed frequency to the RFIDsmart card, the electromagnetic wave excitation, LC resonant circuit of RFID smart card to produce resonance, so that the capacitor has charge, at the other end ofthe capacitor, connected with a unidirectional conduction electron pump, the charge in the capacitance to another capacitor memory, when the accumulated charge reaches 2V, the capacitor can be used as a power source provides working voltage for other circuits, the card data transmitted or received RFID reader data.By providing a voltage and emission data and data to realize the most close to thelife of RFID technology in the modern life to accept the application, change life.

RFID not only can help an enterprise greatly improve the efficiency of goods,information management, also can let the sales and manufacturing enterprisesinterconnection, thus more accurately receiving feedback information, control the demand information, optimize the entire supply chain. Each field of RFID technology in the future will be more applied to the life.