CN106355122B - A kind of RF card reader circuit - Google Patents

A kind of RF card reader circuit Download PDF

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Publication number
CN106355122B
CN106355122B CN201610724089.5A CN201610724089A CN106355122B CN 106355122 B CN106355122 B CN 106355122B CN 201610724089 A CN201610724089 A CN 201610724089A CN 106355122 B CN106355122 B CN 106355122B
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Prior art keywords
circuit
capacitor
chip
controller
connect
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CN201610724089.5A
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Chinese (zh)
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CN106355122A (en
Inventor
周志强
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Guangdong NANDA robot Co., Ltd.
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Jiangmen Huilang Industrial Robot Co Ltd
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Priority to CN201610724089.5A priority Critical patent/CN106355122B/en
Publication of CN106355122A publication Critical patent/CN106355122A/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves

Abstract

The invention discloses a kind of RF card reader circuits, the RF chip being connect including MCU and respectively with MCU, power circuit, usb circuit, indicating circuit, the RF chip is connect by antenna-matching circuit with RF antenna, the RF chip include interface controller and respectively with interface controller communication connection sequence controller, register, first in first out controller, EEPROM cell, encryption unit, randomizer, interrupt control unit, counter, programmable timer, period frame generation unit, cyclic redundancy/parity elements, encoding and decoding controller, serial data controller, the serial data controller output end is connected with demodulator and input terminal connection RF transmitter.The present invention uses completely new RF chip structure, supports the read-write of S50, S70 card, meets non-contact IC card standard agreement, realize pursuit of the consumer for high performance-price ratio.

Description

A kind of RF card reader circuit
Technical field
The present invention relates to card reader, particularly relate to a kind of RF card reader circuit.
Background technique
RFID (radio frequency identification) is that one kind for being identified using wireless mode to electric data carrier (electronic tag) is new Emerging technology.With the systematic comparisons such as Contact Type Ic Card and bar code recognition, it has big advantage.Using Radio Frequency Identification Technology, It can effectively realize that information big to quantity, that distributed areas are wide carries out intelligent management, achieve the purpose that efficient quick operates, especially Be second generation identity card, logistics, traffic shipping, automatic charging, supermarket, access control system management, in terms of have Broad application prospect.13.56MRFID technical application occasion is numerous, and card type is numerous, and it is maximum to dispose quantity at present.
Existing market 13.56MRFID card-reader style is numerous, and expensive but performance is general, is not able to satisfy consumer couple In the demand of high performance-price ratio, reason of searching to the bottom is exactly that core circuit is not brilliant enough, it would be highly desirable to improve and be promoted.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of RF card reader circuits.
The technical scheme adopted by the invention is as follows:
A kind of RF card reader circuit, the RF chip being connect including MCU and respectively with MCU, power circuit, USB interface electricity Road, indicating circuit, the RF chip are connect by antenna-matching circuit with RF antenna, the RF chip include interface controller and It is single with the sequence controller of interface controller communication connection, register, first in first out controller, EEPROM cell, encryption respectively Member, randomizer, interrupt control unit, counter, programmable timer, period frame generation unit, cyclic redundancy/odd even school Verification certificate member, encoding and decoding controller, serial data controller, the serial data controller output end are connected with demodulator and input End connection RF transmitter.
The RF chip further includes the reset control unit connecting with sequence controller.
The RF chip further includes the clock generating unit connecting with sequence controller.
The MCU is connected with the first crystal oscillating circuit, first crystal oscillating circuit by resistance R6, capacitor C10, capacitor C11 and 8.0MHz crystal oscillator Y2 composition.
The RF chip is connected with the second crystal oscillating circuit, second crystal oscillating circuit by resistance R7, capacitor C23, capacitor C24 with And 13.56MHz crystal oscillator Y1 composition.
The antenna-matching circuit includes EMC low-pass filter circuit, impedance matching circuit, signal coupled capacitor, frequency dividing electricity Road, which connect with RF antenna and other end connection signal coupled capacitor, the signal coupled capacitor point It is not connect with EMC low-pass filter circuit, frequency dividing circuit, the EMC low-pass filter circuit input terminal and RF chip signal transmitting terminal TX2 Connection, the frequency dividing circuit output end are connect with RF chip signal receiving end RX.
The EMC low-pass filter circuit is made of inductance L1, capacitor C17, capacitor C26, and the impedance matching circuit is by electricity Resistance R20, capacitor C18, capacitor C25 composition are with for matching antenna impedance, the signal coupled capacitor includes capacitor C19, capacitor C20, the frequency dividing circuit include resistance R14, resistance R15.
Beneficial effects of the present invention: the present invention uses completely new RF chip structure, supports the read-write of S50, S70 card, meets non- Contact Type Ic Card standard agreement, suitable for 32 Windows7 systems and Windows8 operating systems, USB2.0 interface, work Voltage;5 volts of USB port input direct-current, and the LDO (lm1117-3.3v) changed is 3.3V, electric current is less than 300mA, master control core Piece: 32 core processors of STM32F103C8T6-, work dominant frequency 72MHz, and the flash memory and SRAM of 64-128KB carries out;RF chip FM1701 uses 0.6 micrometre CMOS EEPROM technique, under 13.56MHz contactless communication agreement, is calculated based on Mifare encryption The secret key encryption unit and preservation EEPROM of method, SPI interface communication, digital-to-analog/emission mode have independent power supply, realize Pursuit of the consumer for high performance-price ratio.
Detailed description of the invention
A specific embodiment of the invention is described further with reference to the accompanying drawing.
Fig. 1 is the principle framework figure of RF card reader circuit of the present invention;
Fig. 2 is the circuit diagram of the first crystal oscillating circuit of the invention;
Fig. 3 is the circuit diagram of the second crystal oscillating circuit of the invention;
Fig. 4 is the matched circuit diagram of inventive antenna.
Specific embodiment
As shown in fig.1, being a kind of RF card reader circuit of the invention, the RF core being connect including MCU and respectively with MCU Piece, power circuit, usb circuit, indicating circuit, the RF chip are connect by antenna-matching circuit with RF antenna, the RF Chip includes interface controller and the sequence controller communicated to connect respectively with interface controller, register, first in first out control Device processed, EEPROM cell, encryption unit, randomizer, interrupt control unit, counter, programmable timer, period frame are raw At unit, cyclic redundancy/parity elements, encoding and decoding controller, serial data controller, serial data controller output End is connected with demodulator and input terminal connection RF transmitter, and the RF chip further includes the reset control connecting with sequence controller Unit processed, the RF chip further include the clock generating unit connecting with sequence controller.
If Fig. 2, the MCU are connected with the first crystal oscillating circuit, first crystal oscillating circuit is by resistance R6, capacitor C10, capacitor C11 and 8.0MHz crystal oscillator Y2 composition.Such as Fig. 3, the RF chip is connected with the second crystal oscillating circuit, second crystal oscillator electricity Routing resistance R7, capacitor C23, capacitor C24 and 13.56MHz crystal oscillator Y1 composition.
As shown in figure 4, the antenna-matching circuit includes EMC low-pass filter circuit, impedance matching circuit, signal coupling electricity Hold, frequency dividing circuit, which connect with RF antenna (ANT) and other end connection signal coupled capacitor, should Signal coupled capacitor is connect with EMC low-pass filter circuit, frequency dividing circuit respectively, the EMC low-pass filter circuit input terminal and RF core Piece signal transmitting terminal TX2 connection, the frequency dividing circuit output end are connect with RF chip signal receiving end RX.
Wherein, the EMC low-pass filter circuit is made of inductance L1, capacitor C17, capacitor C26, the impedance matching circuit Be made of resistance R20, capacitor C18, capacitor C25 with for matching antenna impedance, the signal coupled capacitor include capacitor C19, Capacitor C20, the frequency dividing circuit includes that resistance R14, resistance R15, R14, R15 are divided to signal is received, to prevent from receiving Signal voltage is too high and damages chip.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to above embodiment, as long as with Essentially identical means realize that the technical solution of the object of the invention belongs within protection scope of the present invention.

Claims (6)

1. a kind of RF card reader circuit, the RF chip that is connect including MCU and respectively with MCU, power circuit, usb circuit, Indicating circuit, the RF chip are connect by antenna-matching circuit with RF antenna, it is characterised in that: the RF chip includes interface control Device processed and the sequence controller, register, first in first out controller, the EEPROM that communicate to connect respectively with interface controller are mono- Member, encryption unit, randomizer, interrupt control unit, counter, programmable timer, period frame generation unit, circulation are superfluous Remaining/parity elements, encoding and decoding controller, serial data controller, the serial data controller output end are connected with demodulation Device and input terminal connection RF transmitter;
The antenna-matching circuit includes EMC low-pass filter circuit, impedance matching circuit, signal coupled capacitor, frequency dividing circuit, is somebody's turn to do Impedance matching circuit one end is connect with RF antenna and other end connection signal coupled capacitor, the signal coupled capacitor respectively with EMC low-pass filter circuit, frequency dividing circuit connection, the EMC low-pass filter circuit input terminal and RF chip signal transmitting terminal TX2 connect It connects, which connect with RF chip signal receiving end RX.
2. a kind of RF card reader circuit according to claim 1, it is characterised in that: the RF chip further include with sequence The reset control unit of controller connection.
3. a kind of RF card reader circuit according to claim 1, it is characterised in that: the RF chip further include with sequence The clock generating unit of controller connection.
4. a kind of RF card reader circuit according to claim 1, it is characterised in that: the MCU is connected with the first crystal oscillator Circuit, first crystal oscillating circuit are made of resistance R6, capacitor C10, capacitor C11 and 8.0MHz crystal oscillator Y2.
5. a kind of RF card reader circuit according to claim 1, it is characterised in that: the RF chip is connected with the second crystalline substance Shake circuit, which is made of resistance R7, capacitor C23, capacitor C24 and 13.56MHz crystal oscillator Y1.
6. a kind of RF card reader circuit according to claim 1, it is characterised in that: the EMC low-pass filter circuit by Inductance L1, capacitor C17, capacitor C26 composition, the impedance matching circuit by resistance R20, capacitor C18, capacitor C25 form with In matching antenna impedance, the signal coupled capacitor includes capacitor C19, capacitor C20, and the frequency dividing circuit includes resistance R14, electricity Hinder R15.
CN201610724089.5A 2016-08-25 2016-08-25 A kind of RF card reader circuit Active CN106355122B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610724089.5A CN106355122B (en) 2016-08-25 2016-08-25 A kind of RF card reader circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610724089.5A CN106355122B (en) 2016-08-25 2016-08-25 A kind of RF card reader circuit

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CN106355122A CN106355122A (en) 2017-01-25
CN106355122B true CN106355122B (en) 2019-01-22

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CN201610724089.5A Active CN106355122B (en) 2016-08-25 2016-08-25 A kind of RF card reader circuit

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950348A (en) * 2009-08-07 2011-01-19 上海锦诺信息科技有限公司 Radio-frequency card reader
KR20140145065A (en) * 2013-06-11 2014-12-22 주식회사 에스원 Card Reader System of Energy Saving Type by Using RF Leading Frequency and Energy Collection Method
CN104751089A (en) * 2015-04-10 2015-07-01 深圳市卡联科技有限公司 Radiofrequency antenna board and card reading circuit
CN105589084A (en) * 2015-12-23 2016-05-18 杭州电子科技大学 STM32-based Beidou time service positioning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950348A (en) * 2009-08-07 2011-01-19 上海锦诺信息科技有限公司 Radio-frequency card reader
KR20140145065A (en) * 2013-06-11 2014-12-22 주식회사 에스원 Card Reader System of Energy Saving Type by Using RF Leading Frequency and Energy Collection Method
CN104751089A (en) * 2015-04-10 2015-07-01 深圳市卡联科技有限公司 Radiofrequency antenna board and card reading circuit
CN105589084A (en) * 2015-12-23 2016-05-18 杭州电子科技大学 STM32-based Beidou time service positioning device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Mifare1读卡器芯片的软硬件协同设计;杜步瀛;《中国优秀硕士学位论文全文数据库 信息科技辑》;20140315;正文3.4节,4.11节及第57页

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Address after: 529080 First and Second Floors of Teaching Building No. 25, 683 Wuyi Road, Jianghai District, Jiangmen City, Guangdong Province

Patentee after: Guangdong NANDA robot Co., Ltd.

Address before: 529080 Factory Building No. 18, Southeast Industrial District, Jianghai District, Jiangmen City, Guangdong Province (No. 18 bis)

Patentee before: Jiangmen Huilang Industrial Robot Co., Ltd.