CN100533474C - Connecting circuit for connecting double data interface user recognizing card with non-contact front-end chip - Google Patents
Connecting circuit for connecting double data interface user recognizing card with non-contact front-end chip Download PDFInfo
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- CN100533474C CN100533474C CNB2007100473861A CN200710047386A CN100533474C CN 100533474 C CN100533474 C CN 100533474C CN B2007100473861 A CNB2007100473861 A CN B2007100473861A CN 200710047386 A CN200710047386 A CN 200710047386A CN 100533474 C CN100533474 C CN 100533474C
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Abstract
The invention comprises: baseband chip, user's ID card, and non-touched front end chip. Said user card features a second data interface; said non-touched front end chip comprises a main control circuit, a control module and a power module; said non-touched front end chip is connected to said user's ID card through said second data interface.
Description
Technical field
The present invention relates to a kind of near-field communication NFC terminal connecting circuit, be specifically related to the connecting circuit of a kind of double data interface user recognizing card and non-contact front-end chip.
Background technology
In recent years, pay by mails and professionally to have goed deep into our life, brought many facilities,, formed proven technique and stable market based on the E-Payment business of integrated IC-card particularly in fixing place of business to us.Since 2006,, become present focus based on the mobile payment service of mobile phone and mobile communication platform along with near-field communication NFC technology popularization.This emerging market of near-field communication NFC has begun to start, and various solutions emerge in an endless stream.
Shown in Figure 1 is a kind of near-field communication NFC terminal connecting circuit of prior art, comprises noncontact analog front-end chip, security module, baseband chip and Subscriber Identity Module; Described noncontact analog front-end chip is the noncontact analog front-end chip PN511 that NXP company produces; Described security module is the security module SmartMX that NXP company produces, and it is connected with described noncontact analog front-end chip in signal input output interface S2C mode; Described baseband chip is connected with the upper interface of described noncontact analog front-end chip by circuit; Described Subscriber Identity Module is connected with described baseband chip by the ISO7816 interface.Safety chip is handled the data of non-contact application and is preserved and safety management; The noncontact analog front-end chip is finished the interface conversion work of S2C signal and extraneous non-contact signal, and data of using with baseband chip and instruction exchange.The near field communication (NFC) function of sort circuit is realized by the near-field communication module that noncontact analog front-end chip and security module constitute, realize the function of the simulation of noncontact card, noncontact reader and point-to-point communication, this just needs the operator of independent operation safety chip.The appearance of this operator will be broken existing mobile communication operation general layout, suffer the unanimous opposition of mobile operator, and therefore this near-field communication NFC terminal connecting circuit can not satisfy real commercial requirement.
Another kind of prior art is a single-wire-protocol SWP connecting circuit, and integrated Subscriber Identity Module of this circuit and security module utilize the C6 interface of Subscriber Identity Module to be connected with the noncontact analog front-end chip by single-wire-protocol.
Single-wire-protocol SWP connecting circuit has solved the connectivity problem of Subscriber Identity Module and noncontact analog front-end chip effectively, and and maintenances such as existing Subscriber Identity Module standard such as ISO7816, TS102221, TS102600 are compatible, are a kind of schemes that most manufacturers support that is subjected to.But there is following shortcoming in sort circuit:
1. because the C6 interface definition of Subscriber Identity Module is a single-wire transmission line, be a kind of worker's of enjoying a double blessing transmission mode, must increase the modulation-demodulation circuit of more complicated, therefore to the hardware and software designing requirement height of Subscriber Identity Module for realizing the data transmission Subscriber Identity Module, circuit is realized complicated, and cost is higher;
2. single-wire-protocol SWP connecting circuit requires Subscriber Identity Module, noncontact analog chip and portable terminal to transform simultaneously, and is bigger to the influence of industrial chain, and popularization and coordination difficulty are higher;
3. because the C6 interface of Subscriber Identity Module adopts is that the load-modulate mode is carried out both-way communication, the signal that means this interface is accurate digital signal, Subscriber Identity Module can reduce the noise margin of single-wire-protocol SWP signal to the load modulation signal that the noncontact analog front-end chip sends, signal is interfered easily and influences the stability of communication, on the very high product of this class density of components of portable terminal, hardware design (printed circuit board (PCB)) is had any problem.
Summary of the invention
The connecting circuit that the purpose of this invention is to provide a kind of double data interface user recognizing card and non-contact front-end chip, it can make the Subscriber Identity Module circuit design simple, reduces manufacturing cost, and software is realized simple; It need not be transformed simultaneously to Subscriber Identity Module, noncontact analog chip and portable terminal, thereby the integral body that helps mobile non-contact application is promoted; It can obviously improve noise margin, thereby improves the stability of communication.
In order to achieve the above object, technical scheme of the present invention is: the connecting circuit of a kind of double data interface user recognizing card and non-contact front-end chip, the Subscriber Identity Module that comprises baseband chip, is connected with baseband chip with the ISO7816 interface mode and by the ISO7816 interface respectively with the non-contact front-end chip of described baseband chip, User Recognition card connection, described baseband chip and Subscriber Identity Module comprise power interface, reseting interface, clock interface, interface and data-interface, be characterized in: described Subscriber Identity Module is set up second data-interface;
Described non-contact front-end chip comprises main control circuit, control module and power module;
Described main control circuit is connected with power module with described control module respectively by bus;
The input end of described control module is connected with reseting interface, clock interface and the data-interface of described baseband chip respectively by signal wire, and its output terminal is connected with reseting interface, clock interface and second data-interface of described Subscriber Identity Module respectively by signal wire;
The input end of described power module is connected with the power interface of described baseband chip by power lead, and its output terminal is connected with the power interface of described Subscriber Identity Module by power lead.
The connecting circuit of above-mentioned double data interface user recognizing card and non-contact front-end chip, wherein, the data-interface of described Subscriber Identity Module and second data-interface are the pure digi-tal data-interfaces, are half duplex communication.
The connecting circuit of above-mentioned double data interface user recognizing card and non-contact front-end chip, wherein, described control module comprise the clock control switching circuit, the control switching circuit that resets, base band supervisory circuit, card simulation model control circuit and User Recognition card interface circuit;
The input end of described clock control switching circuit is connected with the clock interface of baseband chip, receives base band clock signal and noncontact clock signal, and its output terminal is connected with the clock interface of Subscriber Identity Module, sends the Subscriber Identity Module clock signal;
The input end of the described control switching circuit that resets is connected with the reseting interface of baseband chip, receives base band reset signal and noncontact reset signal, and its output terminal is connected with the reseting interface of Subscriber Identity Module, sends the Subscriber Identity Module reset signal;
Described base band supervisory circuit is connected with clock interface, reseting interface and the data-interface of baseband chip respectively by signal wire, can monitor above-mentioned three signals individually or simultaneously, produces the judgement signal of baseband chip ISO7816 Interface status;
Described card simulation model control circuit is connected with the control interface of clock control switching circuit and the control interface of the control switching circuit that resets respectively by signal wire, produces control signal;
Described User Recognition card interface circuit is connected transmission of data signals by signal wire with second data-interface of Subscriber Identity Module.
The connecting circuit of above-mentioned double data interface user recognizing card and non-contact front-end chip, wherein, described power module comprises Subscriber Identity Module type detection circuit and contains the Subscriber Identity Module power output circuit of switch;
The input end of described Subscriber Identity Module type detection circuit is connected with the power interface of baseband chip, and its output terminal selects control end to be connected with the output of described Subscriber Identity Module power output circuit;
The switch of described Subscriber Identity Module power output circuit is connected with the power interface of baseband chip, and its output selects control end to be connected with the power interface of Subscriber Identity Module.
The connecting circuit of double data interface user recognizing card of the present invention and non-contact front-end chip makes it compared with prior art owing to adopt technique scheme, has the following advantages and good effect:
1. because second data-interface set up of Subscriber Identity Module is defined as half duplex communication, so Subscriber Identity Module do not need to increase the modulation-demodulation circuit of more complicated, and circuit is realized simple, and software is realized simple, has also reduced cost simultaneously;
2. the Subscriber Identity Module on the part market has had extra data-interface, selects this class chip only to support the non-contact application connecting circuit that the present invention proposes by the mode of software upgrading, thereby the integral body that helps mobile non-contact application is promoted;
3. second data-interface set up of Subscriber Identity Module is the pure digi-tal data-interface, the noise margin height, and communication robust is reliable.
Description of drawings
Fig. 1 is the block diagram of the near-field communication NFC terminal connecting circuit of prior art;
Fig. 2 is the block diagram of double data interface user recognizing card of the present invention and non-contact front-end chip connecting circuit;
Fig. 3 is the schematic diagram of double data interface user recognizing card of the present invention and non-contact front-end chip connecting circuit;
Embodiment
Followingly further specify a kind of better embodiment of the present invention according to Fig. 2 and Fig. 3:
As shown in Figure 2, the connecting circuit of double data interface user recognizing card and non-contact front-end chip comprises baseband chip 1, Subscriber Identity Module 2 and non-contact front-end chip 3; In the present embodiment, baseband chip 1 is the baseband chip of the E-GOLD PMB7880 model of Infineon company production, Subscriber Identity Module 2 is Subscriber Identity Modules of the NC128 model of Microchip company exploitation, and non-contact front-end chip 3 is non-contact front-end chip FM1920 with Double Data wire protocol DWP interface of Shanghai Fudan Microelectronics Co., Ltd's exploitation.
Described baseband chip 1 comprise power interface 101, reseting interface 102, clock interface 103, interface 105 and data-interface 107, these 5 interfaces all meet the ISO7816 standard.
Described Subscriber Identity Module 2 comprise the power interface 201 that meets the ISO7816 standard, reseting interface 202, clock interface 203, first keep interface 204, interface 205, data-interface 207, second keep interface 208 and meet second data-interface 206 of Double Data wire protocol DWP.(according to TS 102 600 standards, first keeps interface 204 and second keeps VP and the VM signal end that interface 208 is defined as Subscriber Identity Module high-speed interface USB.)
The described data-interface 207 and second data-interface 206 all are the pure digi-tal data-interfaces, are defined as half duplex communication together, and the functional parameter unanimity.
The total interface of described Subscriber Identity Module 2 is all followed ISO/IEC 7816 and TS 102 221 standards, does not conflict with the pin regulation of TS 102 600 standards simultaneously.
The data-interface 207 of described Subscriber Identity Module 2 is connected transmission of data signals with the data-interface 107 of described baseband chip 1.
Described non-contact front-end chip 3 comprises main control circuit 31, control module 32 and power module 33.
As shown in Figure 3, described main control circuit 31 is connected with power module 33 with described control module 32 respectively by bus.
Described control module comprises clock control switching circuit 321, the control switching circuit 322 that resets, base band supervisory circuit 323, card simulation model control circuit 324 and User Recognition card interface circuit 325.
Described clock control switching circuit 321 is to select 1 logical circuit to realize with 2, selects 1 circuit symbol to represent with 2 of standard in Fig. 3.Select in 1 symbol 2, the two-way horizontal signal is represented signal to be selected, one road vertical signal represents to select control signal: the L interface of clock control switching circuit 321 input ends is connected with the clock interface 103 of baseband chip 1, receives the clock signal (first via horizontal signal) of baseband chip 1 input; 1 interface of clock control switching circuit 321 input ends is connected with the clock circuit (not shown) of non-contact front-end chip 3, receives non-contact front-end clock signal (the second road horizontal signal); The output terminal of clock control switching circuit 321 is connected with the clock interface 203 of Subscriber Identity Module 2, sends to Subscriber Identity Module 2 clock signals; The control interface M of clock control switching circuit 321 is connected with card simulation model control circuit 324, receives the clock control signal (vertical signal) that card simulation model control circuit 324 produces.
The described control switching circuit 322 that resets also is to select 1 logical circuit to realize with 2.The R interface of control switching circuit 322 input ends of resetting is connected with the reseting interface 102 of baseband chip 1, receives base band reset signal (first via horizontal signal); The r interface of control switching circuit 322 input ends of resetting is connected with the reset circuit (not shown) of non-contact front-end chip 3, receives non-contact front-end reset signal (the second road horizontal signal); Control switching circuit 322 output terminals that reset are connected with the reseting interface 202 of Subscriber Identity Module 2, send to Subscriber Identity Module 2 reset signals; The control interface m of control switching circuit 322 of resetting is connected with card simulation model control circuit 324, receives the reseting controling signal (vertical signal) that card simulation model control circuit 324 produces.
In the present embodiment, described clock control switching circuit 321, the control switching circuit 322 that resets are realized by the AOI logic gate; Described clock control switching circuit 321, the control switching circuit 322 that resets can also be realized by MOS or cmos transmission gate.
Described base band supervisory circuit 323 is connected with clock interface 103, reseting interface 102, the data-interface 107 of baseband chip 1 respectively, judges signal according to the signal condition generation baseband chip 1ISO7816 Interface status of above-mentioned interface; Base band supervisory circuit 323 can only be judged the in running order still dormant state of ISO7816 interface of baseband chip 1 by the clock interface 103 of monitoring baseband chip 1, also can be by the clock interface 103 of monitoring baseband chip 1, the state of baseband chip 1ISO7816 interface is judged in the combination of reseting interface 102 and data-interface 107, and can write down baseband chip 1 and the contents such as communications protocol parameter that Subscriber Identity Module 2 transmits in the reset answer process, carry out communication in order to the governor circuit 31 of notifying non-contact front-end chip 3 with suitable parameters type and Subscriber Identity Module 2.
Described User Recognition card interface circuit 325 is connected with second data-interface 206 of Subscriber Identity Module 2, transmission user identification card Double Data wire protocol input/output signal.
Under normal mode of operation, (refer to that terminal is in the routine work pattern of start), card simulation model control circuit 324 output clock control signals (clock switch-over control signal), control clock control switching circuit 321 is selected to keep baseband chip 1 and Subscriber Identity Module 2 to be in pass-through state with the output of base band clock signal; When non-contact application takes place, base band supervisory circuit 323 judge baseband chip 1 whether with Subscriber Identity Module 2 normal communications, if baseband chip 1 is just in communication, card simulation model control circuit 324 control signals keep selecting the base band clock signal to export Subscriber Identity Module 2 to, otherwise switch the output of non-contact front-end clock signal.In order to keep the normal communication of baseband chip 1 and Subscriber Identity Module 2, the base band clock signal is than non-contact front-end clock signal priority height, as long as the clock of baseband chip 1 has signal, then card simulation model control circuit 324 is preferentially selected the base band clock signals.
Under power-down mode (terminal closedown but require still to support the mode of operation of non-contact application), this moment, baseband chip 1 was not worked, card simulation model control circuit 324 will switch to Subscriber Identity Module 2 and non-contact front-end chip 3 is communicated with, transmission non-contact front-end clock signal.
The Subscriber Identity Module reset signal is in power up and occurs under the abnormal conditions effective, because the interface right and wrong of Subscriber Identity Module 2 contact front-end chip 3 connects, powering on of Subscriber Identity Module 2 will be subjected to the control of non-contact front-end chip 3, so in non-contact front-end chip 3 power up, the reset signal of Subscriber Identity Module 2 will be subjected to the control of non-contact front-end chip 3, power on finish after, reset signal and clock signal can be handled equally.In order to keep Subscriber Identity Module 2 to withdraw to the base band communication mode from the non-contact application pattern, the internal state of Subscriber Identity Module 2 remains unchanged, and when not having abnormal operation to take place, the Subscriber Identity Module reset signal under the non-contact application can keep being failure to actuate.
User Recognition card interface circuit 325 is responsible for carrying out the non-contact application communication with Subscriber Identity Module 2, workflow is summarized as follows: the Subscriber Identity Module Double Data wire protocol input/output signal of the back non-contact front-end chip 3 default setting User Recognition card interface circuits 325 that power on is in pull-up state, and Subscriber Identity Module 2 is provided with Subscriber Identity Module Double Data wire protocol input/output signal and is the input attitude; Subscriber Identity Module Double Data wire protocol does not activate in power up, and non-contact front-end chip 3 requires to finish power up before baseband chip 1 and Subscriber Identity Module 2 communications, keeps power supply, clock and reset signal to be in pass-through state; When detecting Subscriber Identity Module 2, non-contact front-end chip 3 enters idle condition, then start the communication of a Subscriber Identity Module Double Data wire protocol, User Recognition card interface circuit 325 sends initialization command by Subscriber Identity Module Double Data wire protocol input/output signal to Subscriber Identity Module 2, judge according to replying of Subscriber Identity Module 2 whether Subscriber Identity Module 2 supports Subscriber Identity Module Double Data wire protocol, if support then set up relevant parameter; After finishing the non-contact application flow process, User Recognition card interface circuit 325 sends to exit command to Subscriber Identity Module 2 by Subscriber Identity Module Double Data wire protocol input/output signal and withdraws from.The process of setting up of above-mentioned Double Data wire protocol can wait for that also Subscriber Identity Module 2 enters idle condition and just carries out, and requires the main control microprocessor CPU of Subscriber Identity Module 2 to have good multitasking ability.
Described power module 33 comprises Subscriber Identity Module type detection circuit 331 and contains the Subscriber Identity Module power output circuit 332 of switch.Subscriber Identity Module power output circuit 332 can select to contain two switches, three switches or a plurality of switch according to actual conditions, and in the present embodiment, Subscriber Identity Module power output circuit 332 contains three switches.The input end of described Subscriber Identity Module type detection circuit 331 is connected with the power interface 101 of baseband chip 1, and its output terminal selects control end to be connected with the three-way switch output of described Subscriber Identity Module power output circuit 332; The first switch s of described Subscriber Identity Module power output circuit 332 is connected with baseband chip 1 power interface 107, and its three-way switch output selects control end to be connected with the power interface 201 of Subscriber Identity Module 2; Described Subscriber Identity Module power output circuit 332 also comprises category-B card power circuit and switch b thereof, and C class card power circuit and switch c thereof, described category-B card power circuit and C class card power circuit are respectively in order to produce 3v and 1.8v voltage.
Standard according to Subscriber Identity Module 2, the Subscriber Identity Module type of card is divided into A, B, C three classes (the corresponding 5V power supply of category-A, the corresponding 3V power supply of category-B, the corresponding 1.8V power supply of C class), present embodiment switches to example with the power supply of category-B and C class two class cards, specify the power module workflow: under normal mode of operation, the power interface 101 output supply voltage signals of baseband chip 1, Subscriber Identity Module type detection circuit 331 directly produces the three-way switch control signal, select to connect the first switch s, directly carry out the testing process of type of card by baseband chip 1 and Subscriber Identity Module 2, that is to say that the operating voltage of Subscriber Identity Module 2 is by baseband chip 1 decision under normal mode of operation; Meanwhile, Subscriber Identity Module type detection circuit 331 cooperates the type of the final Subscriber Identity Module of determining 2 of base band supervisory circuit 323 records, uses in order to power-down mode.Under power-down mode, baseband chip 1 is no longer worked, at this moment Subscriber Identity Module power output circuit 332 is under the control of main control circuit 31, type according to the Subscriber Identity Module 2 that writes down, select to connect with the switch b of category-B card power circuit, the switch c of output 3V power supply or selection and C class card power circuit connects, output 1.8V power supply.Other power supply type can expand with reference to the present embodiment method.
The CPU of Subscriber Identity Module 2 has the multitasking ability in the present embodiment, simultaneously the data at process user identification card Double Data wire protocol interface and 7816 interfaces.
Described main control circuit 31 is microprocessors, and embedded microprocessor is by a lot of selections, and what select for use in the present embodiment is Turbo 8051 micro-processor kernels.
Described baseband chip 1, Subscriber Identity Module 2 and non-contact front-end chip 3 are altogether.
The connecting circuit of double data interface user recognizing card of the present invention and non-contact front-end chip realizes simple, and supported Subscriber Identity Module expanded range has reduced technical costs, and the integral body that helps mobile non-contact application is promoted; The noise margin of circuit is significantly improved simultaneously, and communication robust is reliable.
Claims (4)
1. the connecting circuit of double data interface user recognizing card and non-contact front-end chip, the Subscriber Identity Module that comprises baseband chip, is connected with baseband chip with the ISO7816 interface mode and by the ISO7816 interface respectively with the non-contact front-end chip of described baseband chip, User Recognition card connection, described baseband chip and Subscriber Identity Module comprise power interface, reseting interface, clock interface, interface and data-interface, it is characterized in that: described Subscriber Identity Module is set up second data-interface;
Described non-contact front-end chip comprises main control circuit, control module and power module;
Described main control circuit is connected with power module with described control module respectively by bus;
The input end of described control module is connected with reseting interface, clock interface and the data-interface of described baseband chip respectively by signal wire, and its output terminal is connected with reseting interface, clock interface and second data-interface of described Subscriber Identity Module respectively by signal wire;
The input end of described power module is connected with the power interface of described baseband chip by power lead, and its output terminal is connected with the power interface of described Subscriber Identity Module by power lead.
2. the connecting circuit of double data interface user recognizing card as claimed in claim 1 and non-contact front-end chip is characterized in that: the data-interface of described Subscriber Identity Module and second data-interface are the pure digi-tal data-interfaces, are half duplex communication.
3. the connecting circuit of double data interface user recognizing card as claimed in claim 1 and non-contact front-end chip is characterized in that: described control module comprises the clock control switching circuit, the control switching circuit that resets, base band supervisory circuit, card simulation model control circuit and User Recognition card interface circuit;
The input end of described clock control switching circuit is connected with the clock interface of baseband chip, described clock control switching circuit receives base band clock signal and noncontact clock signal, its output terminal is connected with the clock interface of Subscriber Identity Module, sends to the Subscriber Identity Module clock signal;
The input end of the described control switching circuit that resets is connected with the reseting interface of baseband chip, the described control switching circuit that resets receives base band reset signal and noncontact reset signal, its output terminal is connected with the reseting interface of Subscriber Identity Module, sends to the Subscriber Identity Module reset signal;
Described base band supervisory circuit is connected with clock interface, reseting interface and the data-interface of baseband chip respectively by signal wire, this circuit is the signal that produced of monitoring clock interface, reseting interface and data-interface individually or simultaneously, produces the judgement signal of baseband chip ISO7816 Interface status;
Described card simulation model control circuit is connected with the control interface of clock control switching circuit and the control interface of the control switching circuit that resets respectively by signal wire, produces control signal;
Described User Recognition card interface circuit is connected transmission of data signals by signal wire with second data-interface of Subscriber Identity Module.
4. the connecting circuit of double data interface user recognizing card as claimed in claim 1 and non-contact front-end chip is characterized in that: described power module comprises Subscriber Identity Module type detection circuit and contains the Subscriber Identity Module power output circuit of switch; The input end of described Subscriber Identity Module type detection circuit is connected with the power interface of baseband chip, and its output terminal selects control end to be connected with the output of described Subscriber Identity Module power output circuit;
The switch of described Subscriber Identity Module power output circuit is connected with the power interface of baseband chip, and its output selects control end to be connected with the power interface of Subscriber Identity Module.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100473861A CN100533474C (en) | 2007-10-25 | 2007-10-25 | Connecting circuit for connecting double data interface user recognizing card with non-contact front-end chip |
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| CNB2007100473861A CN100533474C (en) | 2007-10-25 | 2007-10-25 | Connecting circuit for connecting double data interface user recognizing card with non-contact front-end chip |
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| CN101136077A CN101136077A (en) | 2008-03-05 |
| CN100533474C true CN100533474C (en) | 2009-08-26 |
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| CN102413592B (en) * | 2010-09-26 | 2014-11-05 | 中国移动通信有限公司 | User identification card, terminal and related processing method |
| CN103929749A (en) * | 2014-05-06 | 2014-07-16 | 陈大才 | Method using SIM card for two-way communication |
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Address after: 200433, building 4, Fudan Science Park, No. 127 Guotai Road, Shanghai Patentee after: Shanghai Fudan Microelectronic Group Co., Ltd. Address before: 200433, building 4, Fudan Science Park, No. 127 Guotai Road, Shanghai Patentee before: Fudan Microelectronics Co., Ltd., Shanghai |