CN100590989C - Near-field communication handset with multi-way switch interface and method of power supply and communication thereof - Google Patents

Near-field communication handset with multi-way switch interface and method of power supply and communication thereof Download PDF

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Publication number
CN100590989C
CN100590989C CN200710036404A CN200710036404A CN100590989C CN 100590989 C CN100590989 C CN 100590989C CN 200710036404 A CN200710036404 A CN 200710036404A CN 200710036404 A CN200710036404 A CN 200710036404A CN 100590989 C CN100590989 C CN 100590989C
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circuit
power supply
sim card
interface
control circuit
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CN101013903A (en
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李蔚
沈磊
陈安新
刘以非
汪根荣
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Shanghai Fudan Microelectronics Group Co Ltd
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Shanghai Fudan Microelectronics Co Ltd
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Abstract

The invention relates to one near field communication cell phone with multiple path switch interface, which comprises power module, base band chip, SIM card and antenna and is characterized by the following: comprising NFC module composed of circuit connection inner control circuit and multi-path switch interface circuit; the said multiple switch interface circuit comprises power control circuit,regular interface circuit and double interface circuit. The invention provides one near field communication cell phone and its power and communication method with multiple switch interfaces.

Description

Near-field communication handset and the power supply and the means of communication with multi-way switch interface
Technical field
The present invention relates to the mobile phone technique field, when it can make mobile phone possess NFC (near-field communication) function, have low-down realization cost and needn't carry out hardware modification SIM card, realize the communication between NFC device and the SIM card and support the power down operations pattern of NFC, thereby such mobile phone is widely used in contactless payment, gate inhibition, multiple application such as false proof.
Background technology
IC (integrated circuit) blocks the card of non-contact IC (integrated circuit) particularly through the development of more than ten years, has goed deep into each corner of the modern life, is widely used in fields such as public transport, gate inhibition, doit electronic payment.In recent years, under demands such as track traffic, logistics management, article anti-counterfeit, identification promote, non-contact IC (integrated circuit) card (perhaps electronic tag) continuous advancement in technology, use more and more universally, press for all kinds of contactless ics (integrated circuit) cards (perhaps electronic tag) identification equipment.Meanwhile, mobile phone experiences more than 20 year developing rapidly, has almost become the portable device that resident's staff is had, and popularity rate is very high, and the integrated multi-purpose trend of oriented mobile phone.
NFC (Near Field Communication near-field communication) is a kind of emerging technology of this develop rapidly in several years, propose by Sony, Philips and Nokia, it makes two electronic equipments directly can carry out the communication of short distance, is operated in the 13.56MHz frequency range, several centimetres of operating distances.The NFC technical goal is the Near Field Communication between the electronic equipment, mainly realizes three class functions: contactless ic card analog functuion; The Point-to-Point Data communication function; The card reader function.Typical NFC mobile phone also needs an extra safety chip except the NFC chip itself is finished the interface and agreement of noncontact communication, be used for the safety management (key management and encryption communication) of communication and the storage of NFC application data, as shown in Figure 1.The cost of this scheme is higher, and needs special design to realize the NFC function under the mobile phone power-down mode, and the existence of this safety chip has simultaneously also influenced the enthusiasm that mobile service provider promotes this scheme.It is the demand that satisfies mobile operator that minority product merchant is arranged, the pattern of NFC device and SIM card chip binding has been proposed, between NFC device and SIM card, increased a line, utilize C6 pin (the EEPROM high pressure programming pin of former 7816 interface definitions of 7816 interfaces of SIM card, because the progress of chip design art, this pin is ineffective) be connected with the NFC chip, and define a kind of single-wire communication agreement and carry out communication, as shown in Figure 2.This method can attract mobile operator to promote the enthusiasm that NFC uses, but need redesign SIM card chip and NFC chip, and it is higher to change cost.
Summary of the invention
A kind of near-field communication handset and the power supply and means of communication provided by the invention with multi-way switch interface, be a kind of implementation method of NFC cheaply, solved the problem of NFC application and mobile operator binding (providing two 7816 interfaces) and mobile phone power down operations pattern to realize the communication function between NFC device and the SIM card.
In order to achieve the above object, the invention provides a kind of near-field communication handset with multi-way switch interface, it comprises power module, baseband chip, SIM card and antenna, its characteristics are, comprise the NFC device that is connected by interface circuit respectively with described power module, baseband chip, SIM card and antenna;
Described NFC device comprises internal control circuit and the multi-way switch interface circuit that circuit connects;
Described multi-way switch interface circuit comprises power control circuit, conventional interface circuit and two-way 7816 interface circuits; A road 7816 interface circuit in described two-way 7816 interface circuits links to each other with described baseband chip 3, another road 7816 interface circuits link to each other with described SIM card 4, switching controls by two-way 7816 interface circuits, can implementation pattern one: baseband chip 3 directly carries out being connected of 7816 interfaces with SIM card 4, disconnect with the internal circuit 102 of NFC device, promptly realize the SIM cards of mobile phones application model of standard; Also can implementation pattern two: 7816 interfaces of baseband chip 3 disconnect, and 7816 interfaces of SIM card 4 are connected with the internal circuit 102 of NFC device, realize the non-contact application related with SIM card; Described conventional interface circuit connects described NFC device and described baseband chip (or other mobile phone main control chip);
Described power control circuit comprises power supply bidirectional power supply circuit, and the battery of mobile phone power supply circuits and the antenna induction energy power supply circuits that connect described power supply bidirectional power supply circuit respectively by switch, this power control circuit can be according to selecting battery supply or antenna induction power supply to give the power supply of bidirectional power supply circuit region to the mode of operation of monitoring and mobile phone, this bidirectional power supply circuit region comprises the part operating circuit and the SIM card circuit of ON-OFF control circuit and NFC device, this part circuit can be worked under the battery of mobile phone condition of power supply, also can be under the mobile phone power-down mode, the power supply that obtains by antenna induction carries out work;
Described battery of mobile phone power supply circuits connect described power supply bidirectional power supply circuit (the part operating circuit and the SIM card of NFC device) by first mains switch, comprise power supply circuits and observation circuit that circuit connects; Described power module (this module refers to that battery of mobile phone through electric power management circuit, is generally LDO, the power supply that provides) is provided described power supply circuits;
Described antenna induction energy power supply circuits connect described power supply bidirectional power supply circuit (NFC device portions operating circuit and SIM card) by the second source switch, comprise rectification circuit and power level change-over circuit (DC/DC) that circuit successively connects described antenna, and circuit connects the radio frequency control circuit of described antenna;
Described two-way 7816 interface circuits comprise power interface and signaling interface;
Described signaling interface comprises data-signal control circuit, clock signal control circuit and reset signal control circuit;
Described data-signal is two-way line, the data-signal control circuit comprises contactor and the drive circuit that some circuit connect, can according to internal control circuit realize baseband chip and SIM card lead directly to be connected and baseband chip and SIM card respectively with the internal control circuit ways of connecting;
Described clock signal is unidirectional line, and clock signal control circuit comprises drive circuit and the signal controlling selection circuit that some circuit connect, and can select provide this signal by baseband chip or internal circuit to SIM card according to control circuit; When the clock signal was provided by internal control circuit, internal control circuit can suitably improve clock signal frequency according to the operating characteristic of SIM card, to quicken communication speed;
Described reset signal is unidirectional line, and the reset signal control circuit comprises drive circuit and the signal controlling selection circuit that some circuit connect, and can select provide this signal by baseband chip or internal control circuit to SIM card according to control circuit;
By the near-field communication handset that the NFC device with multi-way switch interface of the present invention is realized, can realize four kinds of different working modes: normal mode of operation, NFC mode of operation, battery of mobile phone power-down mode and background server communication mode;
Under normal mode of operation, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device directly is communicated with baseband chip and SIM card;
To the bidirectional power supply circuit supply, this moment, this part power supply bidirectional power supply circuit of NFC device was in holding state by battery of mobile phone for step 2, power control circuit, and this part power supply mainly offers SIM card and uses;
The NFC device of this moment is equivalent to line, and baseband chip and SIM card are equivalent to the direct connected mode of regular handset.
Under the NFC mode of operation, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device is connected the internal control circuit of NFC device with SIM card;
Step 2, NFC device are connected with other master control chip of baseband chip or mobile phone by conventional high-speed interface, are connected with baseband chip by road interface circuit in two-way 7816 interface circuits;
Step 3, power control circuit are powered to SIM card and NFC device bidirectional power supply road by battery of mobile phone;
7816 interfaces of NFC device by being connected with SIM card are realized the communication operation between NFC device and the SIM card.The NFC device is monitored routine inquiry SIM card instruction and other burst instruction of baseband chip by 7816 interfaces that are connected with baseband chip, judge whether to send " wait " response according to command request to baseband chip, perhaps initiate interrupt operation, return normal mode of operation; The NFC device carries out the relevant communication operation of NFC by other interface with other main control chip of baseband chip or mobile phone.By these connected modes, the NFC device can select to use the encryption logic circuit that carries, also can select to utilize the encrypted circuit of SIM card chip internal to carry out key management and encryption communication work, adopt this pattern, can simplify the encrypted circuit structure of NFC device inside, thereby reduce cost, the NFC device can also utilize the nonvolatile memory of SIM card inside, download and the relevant data of storage NFC application, both reach the purpose of binding mobile operator, further reduced the NFC device cost again.
Under the battery of mobile phone power-down mode, comprise following steps:
Step 1, mobile phone are when needs are carried out simulation contactless IC card function, when in case mobile phone enters the electromagnetic field zone of contactless IC card card reader, the NFC device is by the aerial coil inductive energy, obtains power supply and to the bidirectional power supply circuit and the SIM card power supply of NFC device;
Multi-way switch interface circuit in the NFC device of step 2, acquisition power supply is closed other path, and only the path between reservation and the SIM card consumes to avoid extra electric current electric leakage;
Step 3, finish the data communication between SIM card and the NFC device, finish the card analog functuion under the battery of mobile phone power-down mode;
Under the background server communication mode, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device closely is connected with SIM card, and can look NFC device and SIM card as a whole this moment, and the NFC device can be used the safety encipher function and the data storage function of SIM card chip;
Step 2, power supply bidirectional power supply circuit are powered to SIM card by the battery of mobile phone power supply circuits;
Step 3, NFC device are connected by other high speed communication interface with baseband chip, utilize the wireless communication function of mobile phone and the background server of application to carry out the secure data communication.
A kind of near-field communication handset and the power supply and means of communication provided by the invention with multi-way switch interface, can make mobile phone when having the NFC function, the NFC application is combined with the SIM card encryption, thereby transfer the enthusiasm of mobile operator, and use under the mobile phone power down operations pattern that must face at NFC, a kind of easy method of supplying power to is provided, feasible requirement to the SIM card transformation minimizes, it no matter is implementation to the NFC mobile phone, still new product development and the supply of material management to SIM card supplier all brings simplification, can promote the NFC application and development better.
Description of drawings
Fig. 1 is the structural representation of typical N FC mobile phone in the background technology;
Fig. 2 is the structural representation that has the NFC mobile phone of one-wire interface in the background technology;
Fig. 3 is a kind of connection diagram of near-field communication handset under normal mode of operation with multi-way switch interface provided by the invention;
Fig. 4 is a kind of connection diagram of near-field communication handset under the NFC mode of operation with multi-way switch interface provided by the invention;
Fig. 5 is a kind of connection diagram of near-field communication handset under the battery of mobile phone power-down mode with multi-way switch interface provided by the invention;
Fig. 6 is a kind of connection diagram of near-field communication handset under the background server communication mode with multi-way switch interface provided by the invention;
Fig. 7 is the structural representation of the power control circuit of a kind of near-field communication handset with multi-way switch interface provided by the invention;
Fig. 8 is the structural representation of the signaling interface of a kind of near-field communication handset with multi-way switch interface provided by the invention.
Embodiment
Followingly specify a kind of better embodiment of the present invention according to Fig. 3~Fig. 8:
The invention provides a kind of near-field communication handset with multi-way switch interface, it comprises power module 2, baseband chip 3, SIM card 4 and antenna 5, its characteristics are, comprise the NFC device 1 that is connected by interface circuit respectively with described power module 2, baseband chip 3, SIM card 4 and antenna 5;
Described NFC device 1 comprises internal control circuit 101 and the multi-way switch interface circuit 102 that circuit connects;
Described multi-way switch interface circuit 102 comprises power control circuit, conventional interface circuit and two-way 7816 interface circuits; A road 7816 interface circuit in described two-way 7816 interface circuits links to each other with described baseband chip 3, another road 7816 interface circuits link to each other with described SIM card 4, switching controls by two-way 7816 interface circuits, can implementation pattern one: baseband chip 3 directly carries out being connected of 7816 interfaces with SIM card 4, disconnect with the internal circuit 102 of NFC device, promptly realize the SIM cards of mobile phones application model of standard; Also can implementation pattern two: 7816 interfaces of baseband chip 3 disconnect, and 7816 interfaces of SIM card 4 are connected with the internal circuit 102 of NFC device, realize the non-contact application related with SIM card; Described conventional interface circuit connects described NFC device 1 and described baseband chip 3 (or other mobile phone main control chip);
In the present embodiment, conventional interface circuit adopts USB (universal serial bus), SPI (Serial PeripheralInterface Serial Peripheral Interface (SPI)) interface, I2C (Inter IC Bus twin wire serial bus interface) interface, USB (Universal Serial Bus USB) interface etc., and two-way 7816 interface circuits adopt two 7816 interface circuits;
In the present embodiment, each module is integrated on the application-specific integrated circuit (ASIC) that model is FM1920;
As shown in Figure 7, described power control circuit comprises power supply bidirectional power supply circuit 1023, and the battery of mobile phone power supply circuits and the antenna induction energy power supply circuits that connect described power supply bidirectional power supply circuit 1023 respectively by switch, this power control circuit can be according to selecting battery supply or antenna induction power supply to give the power supply of bidirectional power supply circuit region to the mode of operation of monitoring and mobile phone, this bidirectional power supply circuit region comprises the part operating circuit and the SIM card circuit of ON-OFF control circuit 1024 and NFC device, this part circuit can be worked under the battery of mobile phone condition of power supply, also can be under the mobile phone power-down mode, the power supply that obtains by antenna induction carries out work;
Described battery of mobile phone power supply circuits connect described power supply bidirectional power supply circuit 1023 (the part operating circuit and the SIM card of NFC device) by first mains switch 1021, comprise power supply circuits 1025 and observation circuit 1026 that circuit connects; Described power module 2 (this module refers to that battery of mobile phone through electric power management circuit, is generally LDO, the power supply that provides) is provided described power supply circuits 1025;
Described antenna induction energy power supply circuits connect described power supply bidirectional power supply circuit 1023 (NFC device portions operating circuit and SIM card) by second source switch 1022, comprise rectification circuit 1028 and power level change-over circuit 1027 (DC/DC) that circuit successively connects described antenna, and circuit connects the radio frequency control circuit 1029 of described antenna 5;
Described two-way 7816 interface circuits comprise power interface and signaling interface;
As shown in Figure 8, described signaling interface comprises data-signal control circuit 10210, clock signal control circuit 10211 and reset signal control circuit 10212;
Described data-signal is two-way line, data-signal control circuit 10210 comprises contactor and the drive circuit that some circuit connect, can according to internal control circuit 101 realize baseband chips and SIM card lead directly to be connected and baseband chip and SIM card respectively with internal control circuit 101 ways of connecting;
Described clock signal is unidirectional line, and clock signal control circuit 10211 comprises drive circuit and the signal controlling selection circuit that some circuit connect, and can select provide this signal by baseband chip or internal circuit to SIM card according to control circuit 101; When the clock signal was provided by internal control circuit 101, internal control circuit 101 can suitably improve clock signal frequency according to the operating characteristic of SIM card, to quicken communication speed;
Described reset signal is unidirectional line, and reset signal control circuit 10212 comprises drive circuit and the signal controlling selection circuit that some circuit connect, and can select provide this signal by baseband chip or internal control circuit to SIM card according to control circuit 101;
The present invention can allow and realize four kinds of different working modes of mobile phone: normal mode of operation, NFC mode of operation, battery of mobile phone power-down mode and background server communication mode;
As shown in Figure 3, under normal mode of operation, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device directly is communicated with 7816 interfaces of baseband chip and SIM card;
Step 2, power control circuit select the battery of mobile phone power supply to power to SIM card;
The NFC device of this moment is equivalent to line, and baseband chip and SIM card are equivalent to the direct connected mode of regular handset.
As shown in Figure 4, under the NFC mode of operation, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device is connected with SIM card the internal control circuit of NFC device by 7816 interfaces;
Step 2, NFC device are connected with other master control chip of baseband chip or mobile phone by the conventional high-speed interface of interface, are connected with baseband chip by another 7816 interface;
Step 3, power control circuit by battery of mobile phone to SIM card and NFC device bidirectional power supply road block supply.
7816 interfaces of NFC device by being connected with SIM card are realized the communication operation between NFC device and the SIM card.The NFC device is monitored routine inquiry SIM card instruction and other burst instruction of baseband chip by 7816 interfaces that are connected with baseband chip, judge whether to send " wait " response according to command request to baseband chip, perhaps initiate interrupt operation, return normal mode of operation; The NFC device carries out the relevant communication operation of NFC by other interface with other main control chip of baseband chip or mobile phone.By these connected modes, the NFC device can select to use the encryption logic circuit that carries, also can select to utilize the encrypted circuit of SIM card chip internal to carry out key management and encryption communication work, adopt this pattern, can simplify the encrypted circuit structure of NFC device inside, thereby reduce cost, the NFC device can also utilize the nonvolatile memory of SIM card inside, download and the relevant data of storage NFC application, both reach the purpose of binding mobile operator, further reduced the NFC device cost again.
Because the clock signal of SIM card is provided by the NFC device under this pattern, the NFC device can be controlled provides clock signal frequency, under the condition that the SIM card function satisfies, provides the communication speed of 7816 interfaces, accelerates the speed that NFC uses communication.
As shown in Figure 5, under the battery of mobile phone power-down mode, comprise following steps:
Step 1, mobile phone are when needs are carried out simulation contactless IC card function, when in case mobile phone enters the electromagnetic field zone of contactless IC card card reader, the NFC device is by the aerial coil inductive energy, obtains power supply and to the bidirectional power supply circuit and the SIM card power supply of NFC device;
Multi-way switch interface circuit in the NFC device of step 2, acquisition power supply is closed other path, and only the path between reservation and the SIM card consumes to avoid extra electric current electric leakage;
Carry out data communication between step 3, SIM card and the NFC device, realize the card analog functuion under the battery of mobile phone power-down mode.
As shown in Figure 6, under the background server communication mode, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device closely is connected with SIM card, and can look NFC device and SIM card as a whole this moment, and the NFC device can be used the safety encipher function and the data storage function of SIM card chip;
Step 2, power control circuit select the battery of mobile phone power supply circuits to power to SIM card;
Step 3, NFC device are connected by 7816 interfaces or other high speed communication interface (UART, SPI, I2C, USB, SD etc.) with baseband chip, utilize the wireless communication function of mobile phone and the background server of application to carry out the secure data communication.
Described data-signal control circuit control data signal is in transmitted in both directions between baseband chip and the SIM card, between the internal control circuit of baseband chip and NFC device, between the internal control circuit of NFC device and the SIM card; Clock signal control circuit and reset signal control circuit then respectively control clock signal and reset signal from baseband chip to the SIM card one-way transmission.
A kind of near-field communication handset and the power supply and means of communication provided by the invention with multi-way switch interface, can make mobile phone when having the NFC function, the NFC application is combined with the SIM card encryption, thereby transfer the enthusiasm of mobile operator, and use under the mobile phone power down operations pattern that must face at NFC, a kind of easy method of supplying power to is provided.By this method, can directly use the SIM chip of present extensive application, only need the COS of SIM card is upgraded, again develop the SIM card chip and needn't spend great amount of investment, feasible requirement to the SIM card transformation minimizes, no matter be the implementation to the NFC mobile phone, still new product development and the supply of material management to SIM card supplier all brings simplification, can promote the NFC application and development better.

Claims (8)

1. near-field communication handset with multi-way switch interface, comprise power module (2), baseband chip (3), SIM card (4) and antenna (5), it is characterized in that, also comprise the NFC module (1) that is connected by interface circuit respectively with described power module (2), baseband chip (3), SIM card (4) and antenna (5);
Described NFC module (1) comprises internal control circuit (101) and the multi-way switch interface circuit (102) that circuit connects;
Described multi-way switch interface circuit (102) comprises power control circuit, conventional interface circuit and two-way 7816 interface circuits; A road 7816 interface circuit in described two-way 7816 interface circuits links to each other with described baseband chip (3), another road 7816 interface circuits link to each other with described SIM card (4), switching controls by two-way 7816 interface circuits, SIM card (4) both can be connected realization standard cell phone function with baseband chip (3), also can be connected with NFC device (1) and realize the non-contact application function; Described conventional interface circuit connects described NFC device (1) and described baseband chip (3) or other mobile phone main control chip;
Described power control circuit comprises power supply bidirectional power supply circuit (1023), and the battery of mobile phone power supply circuits and the antenna induction energy power supply circuits that connect described power supply bidirectional power supply circuit (1023) respectively by switch;
Described two-way 7816 interface circuits comprise power interface and signaling interface;
Described signaling interface comprises data-signal control circuit (10210), clock signal control circuit (10211) and reset signal control circuit (10212).
2. the near-field communication handset with multi-way switch interface as claimed in claim 1, it is characterized in that, described battery of mobile phone power supply circuits connect described power supply bidirectional power supply circuit (1023) by first mains switch (1021), and described battery of mobile phone power supply circuits comprise power supply circuits (1025) and the observation circuit (1026) that circuit connects; Described power supply circuits (1025) connect described power module (2).
3. the near-field communication handset with multi-way switch interface as claimed in claim 1, it is characterized in that, described antenna induction energy power supply circuits connect described power supply bidirectional power supply circuit (1023) by second source switch (1022), comprise described antenna induction energy power supply circuits successively circuit connect the rectification circuit (1028) and the DC voltage converting circuit DC/DC (1027) of described antenna, and circuit connects the radio frequency control circuit (1029) of described antenna (5).
4. the near-field communication handset with multi-way switch interface as claimed in claim 1, it is characterized in that, described data-signal is two-way line, data-signal control circuit (10210) comprises contactor and the drive circuit that some circuit connect, according to internal control circuit realize baseband chip and SIM card lead directly to be connected and baseband chip and SIM card respectively with the internal control circuit ways of connecting.
5. the near-field communication handset with multi-way switch interface as claimed in claim 1, it is characterized in that, described clock signal is unidirectional line, clock signal control circuit (10211) comprises drive circuit and the signal controlling selection circuit that some circuit connect, and selects to provide this signal by baseband chip or internal circuit to SIM card according to control circuit; When the clock signal was provided by internal control circuit, internal control circuit improved clock signal frequency according to the operating characteristic of SIM card, quickens communication speed.
6. the near-field communication handset with multi-way switch interface as claimed in claim 1, it is characterized in that, described reset signal is unidirectional line, reset signal control circuit (10212) comprises drive circuit and the signal controlling selection circuit that some circuit connect, and selects to provide this signal by baseband chip or internal control circuit to SIM card according to control circuit.
7. the near-field communication handset with multi-way switch interface as claimed in claim 1 is characterized in that, described conventional interface circuit is USB (universal serial bus), Serial Peripheral Interface (SPI), twin wire serial bus interface, USB (universal serial bus).
8. the power supply and means of communication with near-field communication handset of multi-way switch interface, it is characterized in that the described power supply and the means of communication can be worked mobile phone under four kinds of different modes: normal mode of operation, NFC mode of operation, battery of mobile phone power-down mode and background server communication mode;
Under described normal mode of operation, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device directly is communicated with baseband chip and SIM card;
To the bidirectional power supply circuit supply, this moment, this part power supply bidirectional power supply circuit of NFC device was in holding state by battery of mobile phone for step 2, power control circuit, and this part power supply mainly offers SIM card and uses;
Under described NFC mode of operation, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device is connected the internal control circuit of NFC device with SIM card;
Step 2, NFC device are connected with other master control chip of baseband chip or mobile phone by conventional high-speed interface, are connected with baseband chip by a road 7816 interface circuit in two-way 7816 interface circuits;
Step 3, power control circuit are powered to SIM card and NFC device bidirectional power supply road by battery of mobile phone;
Under described battery of mobile phone power-down mode, comprise following steps:
Step 1, mobile phone are when needs are carried out simulation contactless IC card function, when in case mobile phone enters the electromagnetic field zone of contactless IC card card reader, the NFC device is by the aerial coil inductive energy, obtains power supply and to the bidirectional power supply circuit and the SIM card power supply of NFC device;
Multi-way switch interface circuit in the NFC device of step 2, acquisition power supply is closed other path, and only the path between reservation and the SIM card consumes to avoid extra electric current electric leakage;
Step 3, finish the data communication between SIM card and the NFC device, finish the card analog functuion under the battery of mobile phone power-down mode;
Under described background server communication mode, comprise following steps:
Multi-way switch interface circuit in step 1, the NFC device closely is connected with SIM card, and can look NFC device and SIM card as a whole this moment, and the NFC device can be used the safety encipher function and the data storage function of SIM card chip;
Step 2, power supply bidirectional power supply circuit are powered to SIM card by the battery of mobile phone power supply circuits;
Step 3, NFC device are connected by other high speed communication interface with baseband chip, utilize the wireless communication function of mobile phone and the background server of application to carry out the secure data communication.
CN200710036404A 2007-01-12 2007-01-12 Near-field communication handset with multi-way switch interface and method of power supply and communication thereof Active CN100590989C (en)

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