CN2678018Y

CN2678018Y - Double-frequency hand electronic label read-write apparatus

Info

Publication number: CN2678018Y
Application number: CN 200420019318
Authority: CN
Inventors: 王洁民; 王伟; 顾啸; 杨洪飞; 徐鹤森
Original assignee: Shanghai Hsic Application System Co ltd
Current assignee: Shanghai Hsic Application System Co ltd
Priority date: 2004-01-08
Filing date: 2004-01-08
Publication date: 2005-02-09
Anticipated expiration: 2014-01-08

Abstract

To adapt with the IC application with two frequencies, a radio frequency read-write module which is designed by the utility model and uses a pair of antennas and two frequencies can receive two electronic labels with different frequencies. A safety module is arranged to connect and communicate with a chip microprocessor which is also connected and communicated with a flash memory FLASH and a random memory RAM. A liquid crystal display screen is connected and communicated with the chip microprocessor by the I/O expansion of a programmable logic device PLD. The radio frequency read-write module reads the information of the electronic label, the public key and the check code authentication information in the electronic label is transmitted to the safety module for decryption and arithmetic through the chip microprocessor, and then the result which is returned back to RAM is compared with the clear text digital summarization in the electronic label to complete the safety check. The utility model has the advantages that the electronic label with two frequencies is identified automatically without adding additional equipment, and the utility model adopts Chinese language display and has powerful function, small volume, convenient carry and strong safety.

Description

Bifrequency hand-held electronic tag read-write equipment

Technical field

The utility model relates to a kind of read write line of electronic tag, a kind of read-write equipment of intellective IC card.

Background technology

Read write line in the market operates mainly in a kind of frequency, and along with the widespread use of the IC-card of two kinds of frequencies, and the appearance of card reader that can compatible two kinds of frequencies is more and more called in market.

Summary of the invention

In order to adapt to the application of the IC with two kinds of frequencies, radio frequency module for reading and writing two kinds of frequencies of common antenna of the utility model design, can receive the electronic tag of two kinds of different frequencies, one security module is set is connected communication with chip microprocessor, chip microprocessor also with flash memory FLASH, random access memory ram connects communication, one LCDs is connected communication through the I/O of programmable logic device (PLD) PLD expansion with chip microprocessor, the radio frequency module for reading and writing reads the information of electronic tag, through chip microprocessor with the public-key cryptography in the electronic tag, after the check code authentication information is delivered to security module and is decrypted computing, the plaintext digital digest that is back in RAM and the electronic tag compares, and implements safety check;

Because be the hand-held read write line, conserver power source is an important indicator, designs a direct current power-switching circuit, is cut off the electricity supply automatically after surpassing 10 seconds under the holding state by the chip microprocessor control system; For expanded function, the circuit that design has RS-232 to be connected with chip microprocessor, and keyboard expands and the chip microprocessor communication through the I/O of PLD, and implement real-time liquid crystal display.

The utility model has the advantages that, can discern the electronic tag of two kinds of frequencies automatically, and need not to increase extra equipment that adopt Chinese to show, powerful, the IC-card of applicable two kinds of frequencies uses, volume is little, and is easy to carry, and security is extremely strong.

Description of drawings

Accompanying drawing 1 is a functional-block diagram of the present utility model.

Accompanying drawing 2 is this practical chip microprocessor, FLASH storer, RAM storage

Device and interface circuit schematic diagram thereof.

Accompanying drawing 3 is security module and interface circuit schematic diagram thereof.

Accompanying drawing 4 is direct-current power supply converting circuit schematic diagrams.

Accompanying drawing 5 is clock circuit schematic diagrams.

Accompanying drawing 6 is RS-232 change-over circuit schematic diagrams.

Accompanying drawing 7 is PLD and interface circuit schematic diagram thereof.

Embodiment

See also shown in the accompanying drawing 1, radio frequency module for reading and writing two kinds of frequency 125KHz of common antenna and 13.56MHz, can receive the electronic tag of two kinds of different frequencies, one security module is set is connected the function news with the little processing of monolithic, chip microprocessor also with flash memory FLASH, random access memory ram connects communication, one LCDs is connected communication through the I/O of programmable logic device (PLD) PLD expansion with chip microprocessor, the radio frequency module for reading and writing reads the information of electronic tag, through chip microprocessor with the public-key cryptography in the electronic tag, after the check code authentication information is delivered to security module and is decrypted computing, the plaintext digital digest that is back in RAM and the electronic tag compares, and implements safety check.

See also shown in the accompanying drawing 2, chip microprocessor U102 is a key control unit of the present utility model, all operations (comprising read-write, computing, storage, communication ...) of system all be at it participation, control under finish.Its clock signal is provided by the circuit that capacitor C 101, capacitor C 102, crystal oscillator U101, R101 form.Capacitor C 104 is used for stablizing the power supply signal of chip microprocessor.Capacitor C 103, resistance R 103 constitute reset circuit with on-chip circuit.U103 is a latch, and the address signal of chip microprocessor I/O, data-signal are separated.U104 is flash memory (FLASH), is responsible for storaging user data, program, provides the secondary development environment to the user, allows the user according to self environment needs, additional specific function.U105 is the RAM storer, the intermediate data during storage running, program.

See also shown in the accompanying drawing 3, security module and interface circuit thereof are core circuits of the present utility model, are made up of two parts: crystal oscillator U302 produces sinusoidal wave, and phase inverter U301A shaping obtains the time clock square-wave signal.Through phase inverter U301B and tri-state gate circuit U303A, U304 provides clock signal to security module, wherein, the clock signal of triple gate U303A control input security module U304, when having only security module U304 work, the ability input clock signal; It is current-limiting resistance that diode D301, D302, D303 protect R302, R304 to the security module communication signal; R303 is a pull-up resistor; BG301 is a switch triode, by chip microprocessor SVCC end, and by current-limiting resistance R304, the switch of control security module power supply.

See also shown in the accompanying drawing 4, the characteristics that the utility model is portable, decision systems must be by battery as power supply, and energy efficient is an important indicator of design.For this reason, we have designed the energy-saving mode power supply, but self-sustaining, also can be from turn-offing.U305 is the DC-DC power conversion chip, and inductance L 301 is the standard connection.System's power supply is BAT301.Capacitor C 303, C304, C305 are used for filtering

Remove noise.The SET label is that diode D304, D305, resistance R 305, R306 constitute self-hold circuit.When the user presses the keyboard switch key, POW1, POW2 two ends closure, the SHDN end input high level of U305, system gets.Chip microprocessor get electric after, immediately SET end is put high level.The user discharges keyboard switch, and POW1, POW2 two ends disconnect, and the SHDN of U305 holds still input high level, forms self-sustaining.When system is under the holding state when surpassing 1 minute, chip microprocessor is put low level, automatically cutting off power source with the SET end.

See also shown in the accompanying drawing 5, clock circuit be used for register system time year, month, day, week, hour, minute, second, U306 is a clock chip, the recording clock signal.Resistance R 307, R308 are pull-up resistor.Crystal oscillator U307 and capacitor C 306 constitute crystal oscillating circuit.Lithium battery BAT302 provides power supply to U306 under the idle state of system, the retention tab internal information is not lost.When system is in running order, provide power supply to U306 by VCC.Diode D307 prevents that lithium battery BAT302 from powering to total system.Capacitor C 307 steady power supply signals.

See also shown in the accompanying drawing 6, RS-232 module of the present utility model provides and the microcomputer communication interface, adopts the RS-232 communications protocol, and the user can upload, download the data of intelligent label read write line by microcomputer, makes things convenient for the renewal of user data, program.U201 is a RS-232 conversion of signals chip, is responsible for the signal that RS-232 signal and system are discerned is changed mutually.U202 is the module for reading and writing of RS-232.Chip microprocessor IVCC end is powered to read-write chip by current-limiting resistance R201 control triode BG201.J201 is a standard RS-232 interface, connects microcomputer.Capacitor C 201, C202, C203, C204 all are normal usage.

For making systemic-function more powerful, good extendability is arranged, we use the I/O (seeing also shown in the accompanying drawing 7) of PLD (programmable logic device (PLD)) U204 expanding system, and U203 is a power conversion chip, and VCC is changed into the power supply signal that PLD requires.Capacitor C 205, C206 carry out filtering to U203 input, output signal respectively.

The utility model workflow is summarized as follows:

The user clicks the power switch on the keyboard, and system obtains power supply by battery.Chip microprocessor is through PLD, in the LCDs function menu.Chip microprocessor is finished user's demand by the instruction of PLD analysis user in the keyboard input.

The user sends when reading the intelligent label instruction, and the radio frequency module for reading and writing is read the intelligent label internal information, delivers among the RAM through chip microprocessor.Secure authenticated information such as public-key cryptography, check code are sent in the security module again, be decrypted computing, operation result returns RAM, with the digital digest comparison of plaintext in the intelligent label, finishes safety check.The data that need to keep can deposit the FLASH storer in, but long preservation.Verification is correct, can further finish customer requirements, as reads smart tag memory storage information, writing information in intelligent label.

When the user sent the access time instruction, read write command was finished in chip microprocessor and clock chip communication.

The user needs and microcomputer communication, and during reading writing information, chip microprocessor utilizes the RS-232 module, uploads data by FLASH storer or RAM storer to microcomputer.Also Microcomputer Data can be downloaded to the FLASH storer.

Claims

1, a kind of bifrequency hand-held electronic tag read-write equipment, it is characterized in that: radio frequency module for reading and writing two kinds of frequencies of common antenna, can receive the electronic tag of two kinds of different frequencies, one security module is set is connected communication with chip microprocessor, chip microprocessor also with flash memory FLASH, random access memory ram connects communication, one LCDs is connected communication through the I/O of programmable logic device (PLD) PLD expansion with chip microprocessor, the radio frequency module for reading and writing reads the information of electronic tag, through chip microprocessor with the public-key cryptography in the electronic tag, after the check code authentication information is delivered to security module and is decrypted computing, the plaintext digital digest that is back in RAM and the electronic tag compares, and implements safety check.

2, by the described bifrequency hand-held electronic of claim 1 tag read-write equipment, it is characterized in that: the power supply of read write line is by a DC-DC power transfer module chip, diode D304, D305, D306, resistance R 305, R306 and capacitor C 303, C304, C305 constitutes, the SHDN pin of power conversion chip becomes the SET pin through diode D304, and be connected with chip microprocessor, when system get electric after, chip microprocessor send high level to the SET pin, after system is in holding state and surpasses 10 seconds, chip microprocessor is sent low level to the SET pin, makes power conversion chip cut off power supply.

3, by the described bifrequency hand-held electronic of claim 1 tag read-write equipment, it is characterized in that: chip microprocessor also is provided with the connecting circuit with the RS-232 serial port.

4, by the described bifrequency hand-held electronic of claim 1 tag read-write equipment, it is characterized in that: a keyboard is through the I/O of PLD expansion and chip microprocessor communication.