CN201111121Y - The SIM card is connected to the non-contact front-end chip to realize the mobile non-contact device - Google Patents

Abstract

The utility model provides a device for connecting a SIM card to a non-contact front-end chip to realize mobile non-contact, including a baseband chip, a SIM card and a non-contact front-end chip with an ISO7816 interface switching control circuit inserted between the ISO7816 interfaces of the two The method is characterized in that the non-contact front-end chip integrates an ISO7816 interface switching control circuit, and the SIM card can be connected with the non-contact analog front-end chip through the ISO7816 interface switching control circuit to realize the non-contact card function of the mobile terminal. This device is suitable for supporting existing and future various types of SIM cards. The interface can also be used to use the SIM card as a security module for a non-contact reader. It uses pure digital signals, and the noise tolerance is significantly improved. . The utility model can save manufacturing cost and greatly lower the threshold of mobile non-contact application.

Description

The SIM card is connected to the non-contact front-end chip to realize the mobile non-contact device

technical field

The utility model relates to a connection device between a SIM card (subscriber identification card) and a non-contact front-end chip, in particular to a device for connecting a SIM card to a non-contact front-end chip to realize mobile non-contact.

Background technique

In recent years, the electronic payment business has penetrated into our lives and brought us a lot of convenience, especially in fixed business locations, the electronic payment business based on integrated IC cards has formed a mature technology and a stable market. Since 2006, with the popularization of near-field communication (NFC) technology, mobile payment services based on mobile phones and mobile communication platforms have become a hot topic. The emerging market of near-field communication (NFC) has started, and various solutions emerge in an endless stream.

Please refer to Fig. 1, a block diagram of a connection circuit of a near-field communication NFC terminal in the prior art. The connected security module SmartMX produced by NXP, the baseband chip connected with the upper interface of the non-contact front-end analog circuit through lines, and the SIM card connected with the baseband chip through the international standard ISO7816 interface. The ISO7816 interface defines the interface of the IC card (C1 interface is the power supply VCC, C2 interface is the reset RST, C3 interface is the clock CLK, C4 interface is the reserved pin NC (Not Connected not connected), C5 interface is the ground GND, C6 interface is High-voltage programming VPP or NC, C7 interface is data IO, C8 interface is reserved pin NC), among which reserved pins C4 and C8 are NC pins in the current SIM card, not used, but in the new large-capacity SIM card C4 and C8 are defined as USB pins in the high-speed pin specification (ETSI 102600), which will be used in the next generation of large-capacity SIM cards; C6 interface is used as a high-voltage programming VPP pin in early IC cards, and later with the technology With the advancement of design technology, this pin has lost its function, and it is usually treated as an NC pin in the SIM card. The security chip handles data storage and security management of non-contact applications; the non-contact front-end analog chip completes the interface conversion between S2C signals and external non-contact signals, and exchanges application data and instructions with the baseband chip. The near-field communication function of this circuit is realized by a near-field communication module composed of a non-contact front-end analog chip and a security chip to realize the functions of non-contact card simulation, non-contact reader and point-to-point communication, which requires independent operation of the operation of the security chip business. The emergence of this operator will break the existing mobile communication operation pattern, and has been unanimously opposed by mobile operators. Therefore, this kind of near-field communication NFC terminal connection circuit cannot meet the actual business requirements.

Another existing technology is the single-wire protocol SWP connection circuit, which uses the C6 interface of the SIM card to connect with the non-contact front-end chip through the single-wire protocol, thereby replacing the role of the security chip in Figure 1 with the SIM card.

The single-wire protocol SWP connection circuit effectively solves the connection problem between the SIM card and the non-contact analog front-end chip, and is compatible with existing SIM card standards such as ISO7816, TS102221, TS102600, etc., and is a solution supported by most manufacturers. But this circuit has the following disadvantages:

1. Since the C6 interface of the SIM card is defined as a single-wire transmission line, which is a duplex transmission mode, a relatively complex modulation and demodulation circuit must be added to the SIM card to realize data transmission, so the requirements for the hardware and software design of the SIM card are high, and the circuit Complicated implementation and high cost;

2. The single-wire protocol SWP connection circuit requires SIM card chip, non-contact analog chip and mobile terminal to be transformed at the same time, which has a great impact on the industrial chain and is difficult to promote and coordinate;

3. Since the C6 interface of the SIM card uses a load modulation method for two-way communication, it means that the signal of this interface is a quasi-digital signal, and the load modulation signal sent by the SIM card to the non-contact analog front-end chip will reduce the noise of the single-wire protocol SWP signal The tolerance is reduced, the signal is easily interfered and the stability of the communication is affected, and the hardware design (printed circuit board) is difficult for products with very high component density such as mobile terminals.

Utility model content

The purpose of this utility model is to provide a SIM card and non-contact front-end chip connection device, which realizes the mobile non-contact application and the card simulation function of the SIM card on the basis of not changing the baseband chip and the SIM card chip, and the interface is not different from the existing Any IC card standard conflict, the circuit that needs to be modified only needs to be realized by the non-contact front-end chip, the manufacturing cost is greatly reduced, and it is suitable for supporting existing and future various types of SIM cards.

In order to achieve the above object, the technical solution of the utility model is to insert a non-contact front-end chip with an ISO7816 interface switching control circuit between the baseband chip and the ISO 7816 interface of the SIM card, which is characterized in that the non-contact front-end chip is integrated with the non-contact On the basis of the front-end analog circuit, an ISO7816 interface switching control circuit is also integrated, and the non-contact front-end chip is connected to the ISO7816 interface of the baseband chip and the ISO7816 interface of the SIM card through the ISO7816 interface switching control circuit.

The ISO7816 interface switching control circuit includes a main control circuit, a control module and a power module;

The main control circuit is respectively connected to the control module, the power module and the non-contact front-end analog circuit through a bus;

The control module is respectively connected to the baseband chip and the SIM card through the ISO7816 interface;

The input end of the power module is connected to the power interface of the baseband chip through the power line, and the output end is connected to the power interface of the SIM card through the power line.

The above-mentioned SIM card is connected to a non-contact front-end chip to realize a mobile non-contact device, wherein the control module includes: a clock switching control circuit, a reset switching control circuit, a first data switching control circuit, a baseband universal serial interface circuit, A baseband monitoring circuit, a SIM card interface circuit, a second data switching control circuit, a data switching control inverter and a switch control circuit;

Described clock switching control circuit, its input end is connected with the clock interface of baseband chip by the 7816 clock signal line of baseband chip, and the output end is connected with the clock interface of SIM card by the 7816 clock signal line of SIM card;

Described reset switching control circuit, its input end is connected with the reset interface of baseband chip by the 7816 reset signal line of baseband chip, and the output end is connected with the reset interface of SIM card by the 7816 reset signal line of SIM card;

Described first data switching control circuit, it is realized by standard MOS switch, and MOS switch is closed, and the 7816 data lines of baseband chip are communicated with the 7816 data lines of SIM card, transmit bidirectional data signal; MOS switch is opened, and baseband chip and The connection between the SIM cards is cut off;

The baseband universal serial interface circuit, its clock interface is connected with the clock interface of the baseband chip and the input end of the clock switching control circuit through the 7816 clock signal line of the baseband chip, and its reset interface is connected with the baseband through the 7816 reset signal line of the baseband chip The reset interface of the chip is connected to the input end of the reset switching control circuit, and its data interface is connected to the data interface of the baseband chip and the input end of the first data switching control circuit through the 7816 data signal line of the baseband chip;

The baseband monitoring circuit is connected to the baseband universal serial interface circuit through the baseband monitoring signal line;

Described SIM card interface circuit, it communicates with the data interface of SIM card by the 7816 data line of SIM card;

The second data switching control circuit is realized by a standard MOS switch, the MOS switch is closed, the 7816 data lines inside the non-contact front-end chip are connected with the 7816 data lines of the SIM card, and bidirectional data signals are transmitted; the MOS switch is opened, The connection between the data line inside the non-contact front-end chip and the data line of the SIM card is disconnected; the closing and cutting control of the MOS switch and the MOS switch of the first data switching control circuit are reversed;

The data switching control inverter generates the inversion control signals of the aforementioned two MOS switches;

The switch control circuit is connected to the data switching control circuit through the data switching control line, the clock switching control line is connected to the clock switching control circuit, and the reset switching control line is connected to the reset switching control circuit.

The above-mentioned SIM card is connected to a non-contact front-end chip to realize a mobile non-contact device, wherein the power module includes: a SIM card type discrimination circuit and a SIM power output control circuit module;

Described SIM card type discriminating circuit, its input end is connected with the power supply interface of baseband chip by the 7816 power supply signal line of baseband chip, and its output end is connected with the first switch a of SIM power output control circuit module;

Described SIM power output control circuit module, its power input end is connected with the power signal of baseband chip ISO7816 interface, its control input end is connected with the output end of SIM card type discrimination circuit through power output control signal line, and its output end is connected with SIM The power interface of the card is connected through the power supply signal line of the SIM card 7816; the SIM power output circuit module also includes a class B card power circuit and its switch b, a class C card power circuit and its switch c, and the class B card power supply circuit circuit and C-type card power supply circuit to generate 3v and 1.8v voltage.

The utility model has the following advantages:

1. In the process of realizing the connection between the SIM card and the non-contact front-end chip as a non-contact card, the interface of the SIM card does not need any modification, and it is suitable for supporting existing and future various types of SIM cards, and the manufacturing cost is low. significantly reduce.

2. The utility model can also use the interface to use the SIM card as a security module of a non-contact reader, which provides a wider application range for the SIM card.

3. The interface of the utility model adopts pure digital signal, and the noise tolerance is obviously improved.

Description of drawings

Fig. 1 is a block diagram of an existing near-field communication NFC terminal connection device;

Fig. 2 is a block diagram of a device for connecting a non-contact front-end chip to a SIM card of the present invention to realize mobile non-contact;

Fig. 3 is a schematic circuit diagram of a mobile non-contact device realized by connecting a SIM card to a non-contact front-end chip of the present invention.

Detailed ways

A kind of preferred embodiment of the present utility model is described in detail below:

Please refer to Fig. 2 and Fig. 3, the utility model provides a kind of device that SIM card 2 connects non-contact front-end chip 4 and realizes mobile non-contact, comprises baseband chip 1, SIM card 2, has baseband chip ISO7816 interface and SIM card ISO7816 simultaneously The non-contact front-end chip 4 of the interface is characterized in that an ISO7816 interface switching control circuit 41 is integrated on the non-contact analog chip 4, and the SIM card 2 can be connected with the non-contact front-end chip 4 through the ISO7816 interface switching control circuit 4 to realize Contactless card functionality for mobile terminals. In the present embodiment, baseband chip 1 is the baseband chip of the E-GOLD PMB7880 model that Infineon Company produces (the baseband chip that almost all producers produce, its ISO7816 interface is all consistent), and SIM card 2 is the S3FS9DG model that Samsung Company produces The SIM card chip, the non-contact front-end chip 4 is a single-chip integrated circuit developed by Shanghai Fudan Microelectronics Co., Ltd. with the model number FM1920.

The ISO7816 interface switching control circuit 41 includes a main control circuit 4110, a control module and a power module;

The main control circuit 4110 is respectively connected to the control module, the power module and the non-contact front-end analog circuit 42 through a bus;

The control module is connected to the baseband chip 1 and the SIM card 2 respectively through the ISO7816 interface;

The input end of the power module is connected to the power interface of the baseband chip 1 through a power line, and its output end is connected to the power interface of the SIM card 2 through a power line.

The control module of described ISO7816 interface switching control circuit 41 comprises: clock switching control circuit 4101, reset switching control circuit 4102, first data switching control circuit 4103, baseband universal serial interface circuit 4104, baseband interface circuit 4105, SIM card interface A circuit 4106, a switch control circuit 4107, a second data switching control circuit 4108, and a data switching control inverter 4109.

The clock switching control circuit 4101 is realized by a 2-to-1 logic circuit, which is represented by a standard 2-to-1 circuit symbol in FIG. 3 . In the 2-to-1 symbol, signals transmitted by two horizontal signal lines represent signals to be selected, and signals transmitted by one vertical signal line represent selection control signals. The first horizontal signal line interface of the input end of the circuit is connected to the clock interface of the baseband chip 1 through the 7816 clock signal line of the baseband chip 1 to transmit the baseband clock signal; the second horizontal signal line interface of the input end of the circuit is connected to the non- Contact the clock circuit (not shown) of the front-end chip 4 to connect, transmit the non-contact front-end clock signal; the output end is connected with the 7816 clock signal line of the SIM card 2, and send to the SIM card 2 clock signal; the vertical signal of the circuit The line interface is connected with the switch control circuit 4107, and transmits the clock selection control signal.

The reset switching control circuit 4102 is also realized by a 2-to-1 logic circuit, and the first horizontal signal line interface of its input terminal and the reset interface of the baseband chip 1 are connected through the 7816 reset signal line of the baseband chip 1, Transmission baseband reset signal; The signal line interface of the second road level of its input end is connected with the reset circuit (not shown in the figure) of non-contact front-end chip 4, transmits non-contact front-end reset signal; Output end and 7816 reset signal of SIM card 2 connected to the SIM card 2 to send a reset signal; the vertical signal line interface of the circuit is connected to the switch control circuit 4107 to transmit the reset selection control signal.

The data switching control circuit 4103 is used as a connecting device to connect the 7816 data signal of the baseband chip 1 and the 7816 data signal of the SIM card 2, and its switch control signal is connected to the control circuit 4107 through the IO switching control line.

The baseband chip baseband universal serial interface circuit 4104 receives the 7816 clock signal, reset signal and data signal sent by the baseband chip 1 .

The baseband monitoring circuit 4105 is connected to the baseband universal serial interface circuit 4104 through the baseband monitoring signal line;

The SIM card interface circuit 4106 is connected to the 7816 data line of the SIM card 2 through the connecting device 4108;

A switch control circuit 4107, which is connected to the switch control terminal of the data switching control circuit 4103 through the data switching control line, the clock switching control line and the selection control terminal of the clock switching control circuit 4101, the reset switching control line and the reset switching control circuit 4102 The selection control terminal of the second data switching control circuit 4108 is connected to the switching control terminal of the second data switching control circuit 4109 at the same time.

The data switching control circuits 4103 and 4108 are implemented by standard MOS switches. When the baseband chip 1 is connected to the SIM card 2, the MOS switch of the circuit 4103 is turned on, and the BB_7816_IO is connected to the SIM_7816_IO to transmit bidirectional data signals. At this time, the MOS switch of the second data switching control circuit 4108 connected to the SIM card interface circuit 4106 is off, which does not affect the communication between the baseband and the SIM. Under the control of the system, it is in the non-working state or the monitoring state. At this time, the baseband universal serial interface circuit 4104 only receives signals (monitoring and recording the configuration parameters between the baseband chip 1 and the SIM card 2), and does not send signals, that is, it does not affect Communication between the baseband chip 1 and the SIM card 2. When in the non-contact application state (the non-contact application interrupt is triggered, and the baseband monitoring circuit confirms that the ISO7816 interface of the baseband chip is in a dormant state, then the ISO7816 interface switching control circuit 41 performs the non-contact application mode switching), the data switching control circuit 4103 is switched off disconnection, the connection between the baseband chip 1 and the SIM card 2 is cut off, at this time the switch of the second data switching control circuit 4108 is turned on, and the SIM card 1 communicates with the ISO7816 interface switching control circuit 41 of the non-contact front-end chip through the SIM card interface circuit 4106 To realize non-contact application, the baseband universal serial interface circuit 4104 and baseband monitoring circuit 4105 continue to monitor the 7816 interface of the baseband chip 1. If there is no signal change, it will remain until the exit of the non-contact mode. If the ISO7816 interface of the baseband chip 1 is woken up and starts Send the SIM card 2 access command, then the non-contact front-end chip replies to the baseband chip 1 through the baseband universal serial interface circuit 4104 "SIM card is busy, please wait" delay signal, and records the command sent by the ISO7816 interface of the baseband chip 1, When the contactless application is completed, the main control circuit 4110 controls the SIM card interface circuit 4106 to forward the instruction recorded by the baseband universal serial interface circuit 4104 to the SIM card 1 and exit the takeover.

In the normal working mode, the control signal (clock switching control signal) output by the switch control circuit 4107 controls the clock switching control circuit 4101 to select the baseband clock signal output, and keeps the baseband chip 1 and the SIM card 2 in a straight-through state; when the non-contact application occurs , the baseband monitoring circuit 4105 judges whether the ISO7816 interface of the baseband chip 1 communicates with the SIM card 2 normally, if the baseband chip 1 is communicating, the switch control circuit 4107 continues to keep the clock signal of the baseband chip 1 output to the SIM card 2, otherwise switch the non-contact front end Clock signal output. In order to maintain the normal communication between the baseband chip 1 and the SIM card 2, the clock signal of the baseband chip 1 has a higher priority than the clock signal of the non-contact front-end chip 4. As long as the clock signal of the baseband chip 1 has a signal, the baseband monitoring circuit 4105 preferentially selects the baseband chip 1 clock.

When performing non-contact application in power-down mode, the baseband chip 1 does not work, the switch control circuit 4107 will switch to the SIM card 2 and the ISO7816 interface switching control circuit 4 is connected, and the non-contact front-end chip 4 sends a clock signal to the SIM card 2.

The reset signal of the SIM card 2 is effective in the power-on process and abnormal conditions, because the interface of the SIM card 2 is connected with the ISO7816 interface switching control circuit 4 of the non-contact front-end chip, the power-on of the SIM card 2 will be controlled by the non-contact The control of the front-end chip 4, so during the power-on process of the non-contact front-end chip 4, the reset signal of the SIM card 2 will be controlled by the ISO7816 interface switching control circuit 41 of the non-contact front-end chip. After power-on is completed, the reset signal and the clock signal can be handled similarly. In order to keep the SIM card 2 normally exiting from the non-contact application mode to the baseband communication mode, the internal state of the SIM card 2 remains unchanged. When no abnormal operation occurs, the SIM card reset signal under the non-contact application can remain inactive.

The power module of the ISO7816 interface switching control circuit includes: a SIM card type discrimination circuit 4111, a SIM power output control circuit module 4112;

Described SIM card type discriminating circuit 4111, its input end is connected with the power supply interface of baseband chip 1 by the 7816 power signal line of baseband chip 1, and its output end is connected with the first switch a of SIM power supply output control circuit module, and it passes The internal bus is connected to the main control circuit 4110 .

Described SIM power supply output control circuit module 4112, it is made of three select one circuit, and three road power supply inputs are represented by a, b, c respectively, and its switch a is connected with the power supply signal of the ISO7816 interface of baseband chip 1, and its selection control end and the output end of the SIM card type discrimination circuit 4111 are connected through the power output control signal line, and its output end is connected with the power supply interface of the SIM card 2 through the power supply signal line 7816 of the SIM card 2; the SIM power output circuit 42 also includes A class B card power circuit and its switch b, a class C card power circuit and its switch c, the class B card power circuit and the class C card power circuit are used to generate 3v and 1.8v voltages.

According to the standard of SIM card 2, the card type of SIM card is divided into A, B, C three kinds (A class corresponds to 5V power supply, B class corresponds to 3V power supply, and C class corresponds to 1.8V power supply). Take the power switching of two types of cards as an example, and specifically explain the working process of the power module: in the normal working mode (referring to the normal working mode in which the terminal is turned on), the ISO7816 interface of the baseband chip 1 outputs the power supply voltage signal, and the SIM card type discrimination circuit 4111 The generated power supply output selection control signal of the SIM power supply output circuit 4112 keeps the first switch a turned on all the time, that is to say, the working voltage of the SIM card 2 is determined by the power supply of the ISO7816 interface of the baseband chip 1 in the normal working mode; At the same time, the SIM card type discrimination circuit 4111 obtains the power type of the SIM card by judging the ISO7816 power supply voltage signal output by the baseband chip 1, and then informs the main control circuit 4110 to record through the internal bus for use in power-down mode. In the power-down mode (the terminal is shut down but required to still support the working mode of contactless applications), the baseband chip 1 no longer works, and at this time the SIM card type discrimination circuit 4111 obtains the saved SIM card type from the main control circuit 4110, according to the record The type of SIM card 2 generates the selection control signal of the SIM power output control circuit 4112, and controls the SIM power output control circuit 4112 to select and switch on the switch b of the B-type card power circuit to output 3V power or to select and connect to the C-type card power circuit. Switch c is turned on to output 1.8V power. Other power supply types can be expanded with reference to the method of this embodiment.

The utility model provides a device for connecting a SIM card to a non-contact front-end chip to realize mobile non-contact. In the process of realizing the connection between the SIM card and the non-contact front-end chip as a non-contact card application, the interface of the SIM card does not need any modification, which reduces the Technology cost, suitable for supporting existing and future various types of SIM cards, can greatly reduce the threshold of mobile contactless applications. It can also use the interface to use the SIM card as a security module of the non-contact reader, which provides a wider application range for the SIM card. The interface of the utility model uses pure digital signals, the noise tolerance is significantly improved, and the communication is stable and reliable. .

Claims (3)

1, a kind of SIM card (2) connects non-contact front-end chip (4) and realizes moving non-contacting device, comprise baseband chip (1), and it is coupled: SIM card (2) and non-contact front-end mimic channel (42) by the ISO7816 interface, it is characterized in that the non-contact front-end chip (4) of non-contact front-end mimic channel (42) integrated and gone up also integrated connecting the ISO7816 interface of baseband chip (1) and the ISO7816 interface of SIM card (2) respectively by ISO7816 interface control switching circuit (41) non-contact front-end chip (4) by ISO7816 interface control switching circuit (41);

Described ISO7816 interface control switching circuit (41) comprises main control circuit (4110), control module and power module;

Described main control circuit (4110) is connected with power module and non-contact front-end mimic channel (42) with described control module respectively by bus;

Described control module links to each other with SIM card (2) with baseband chip (1) respectively by the ISO7816 interface;

The input end of described power module is connected by the power interface of power lead with described baseband chip (1), and its output terminal is connected by the power interface of power lead with described SIM card (2).

2, SIM card as claimed in claim 1 connects the mobile non-contacting device of non-contact front-end chip realization, it is characterized in that described control module comprises: a clock control switching circuit (4101), the control switching circuit that resets (4102), the first data control switching circuit (4103), a base band USB (universal serial bus) circuit (4104), a base band supervisory circuit (4105), a SIM card interface circuit (4106), the second data control switching circuit (4107), a data switching controls phase inverter (4108) and an ON-OFF control circuit (4109);

Described clock control switching circuit (4101), the clock interface of its input end and baseband chip (1) is connected by 7816 clock cables of baseband chip (1), and the clock interface of output terminal and SIM card (2) is connected by 7816 clock cables of SIM card (2);

The described control switching circuit that resets (4102), the reseting interface of its input end and baseband chip (1) is connected by 7816 reseting signal lines of baseband chip (1), and the reseting interface of output terminal and SIM card (2) is connected by 7816 reseting signal lines of SIM card (2);

The described first data control switching circuit (4103), its MOS switch by standard is realized, the MOS switch closure, 7816 data lines of baseband chip (1) are communicated with 7816 data lines of SIM card (2), transmit two-way data-signal; Be connected cut-out between the MOS switch opens, baseband chip (1) and SIM card (2);

Described base band USB (universal serial bus) circuit (4104), its clock interface links to each other with the clock interface of baseband chip (1) and the input end of clock control switching circuit (4101) by 7816 clock cables of baseband chip (1), its reseting interface links to each other with the input end of the reseting interface of baseband chip (1) and the control switching circuit that resets (4102) by 7816 reseting signal lines of baseband chip (1), and its data-interface links to each other with the data-interface of baseband chip (1) and the input end of the first data control switching circuit (4103) by 7816 data signal lines of baseband chip (1);

Described base band supervisory circuit (4105), it links to each other with base band USB (universal serial bus) circuit (4104) by the base band supervisory signal line;

Described SIM card interface circuit (4106), it is communicated with the data-interface of SIM card (2) 7816 data lines by SIM card (2);

The described second data control switching circuit (4108), its MOS switch by standard is realized, the MOS switch closure, 7816 inner data lines of non-contact front-end chip (4) are communicated with 7816 data lines of SIM card (2), transmit two-way data-signal; The MOS switch opens is connected cut-out between the data line of the inner data line of non-contact front-end chip (4) and SIM card (2); The closure of the MOS switch of this MOS switch and the described first data control switching circuit (4103) is anti-phase with cutting off control;

Described data switching controls phase inverter (4109) produces the anti-phase control signal of aforementioned two MOS switches;

Described ON-OFF control circuit (4107), it passes through: data switching controls line links to each other with data control switching circuit (4108), clock switching controls line and clock control switching circuit (4101) link to each other, reset, and the switching controls line links to each other with the control switching circuit that resets (4102).

3, SIM card as claimed in claim 1 connects the mobile non-contacting device of non-contact front-end chip realization, it is characterized in that the power module of described ISO7816 interface control switching circuit comprises: a SIM card type identification circuit (4111) and a SIM power supply output control circuit module (4112);

A SIM card type identification circuit (4111), the power interface of its input end and baseband chip (1) is connected by 7816 power supply signal lines of baseband chip (1), and its output terminal is connected with the first switch a of SIM power supply output control circuit module (4112);

A SIM power supply output control circuit module (4112), its power input links to each other with the power supply signal of baseband chip (1) ISO7816 interface, the output terminal of its control input end and SIM card type identification circuit (4111) links to each other by power supply output control signal wire, and the power interface of its output terminal and SIM card (2) is connected by the power supply 7816 power supply signal lines of SIM card (2); Described SIM power output circuit module (4112) also comprises category-B card power circuit and switch b thereof, C class card power circuit and switch c thereof, and described category-B card power circuit and C class card power circuit are in order to produce 3v and 1.8v voltage.

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