CN219320772U

CN219320772U - Circuit capable of identifying two smart cards and corresponding electronic equipment

Info

Publication number: CN219320772U
Application number: CN202320192910.9U
Authority: CN
Inventors: 缪春平; 刘荣发
Original assignee: Wuxi Yuning Intelligent Technology Co ltd
Current assignee: Wuxi Yuning Intelligent Technology Co ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-07-07
Anticipated expiration: 2033-02-09

Abstract

The utility model provides a circuit capable of identifying two smart cards and corresponding electronic equipment, and a card seat can be used for placing the smart cards. The voltage transmission module outputs the first identification voltage to the card seat, or the voltage transmission module outputs the second identification voltage to the card seat. The data switch module outputs the data signal output by the card seat to the application platform, or the data switch module outputs the data signal to the singlechip module. The application platform can output a first identification voltage based on the trigger signal, and based on the data signal, the application platform can identify whether the SIM card is placed on the card holder and output an identification result to the system. And when the application platform does not recognize the SIM card, the application platform outputs a control signal. The single-chip microcomputer module can output the second identification voltage based on the control signal, and the single-chip microcomputer module converts the data signal into the identification signal. Based on the identification signal, the application platform can identify that the card holder is used for placing the PSAM card or the card holder is used for placing the unrecognizable card, and the application platform outputs the identification result to the system.

Description

Circuit capable of identifying two smart cards and corresponding electronic equipment

Technical Field

The present utility model relates to the field of circuits, and in particular, to a circuit capable of identifying two smart cards and a corresponding electronic device.

Background

With the demands of some special professional industries, electronic equipment needs to support mobile wireless communication functions and realize some financial interaction functions. Therefore, the electronic device needs to support both reading and writing of the smart card. Therefore, the electronic device needs to be provided with two card holders. However, the requirements for the exquisite design of the whole machine are becoming stricter, so that the whole machine does not have a space for placing various card holders. Therefore, the existing whole product has the technical problem that the read-write requirements of two smart cards cannot be supported.

Therefore, it is desirable to provide a circuit capable of identifying two smart cards and a corresponding electronic device to solve the above-mentioned problems.

Disclosure of Invention

The utility model provides a circuit capable of identifying two smart cards and corresponding electronic equipment, and effectively solves the technical problem that the existing whole product cannot support the read-write requirements of the two smart cards.

The utility model provides a circuit capable of identifying two smart cards, which comprises:

the card seat is used for placing the smart card and outputting a trigger signal;

the voltage transmission module is used for outputting a first identification voltage provided by the application platform to the card seat or outputting a second identification voltage provided by the singlechip module to the card seat;

The data switch module is used for outputting the data signal output by the card seat to the application platform based on the first switching signal output by the application platform or outputting the data signal to the singlechip module based on the second switching signal output by the application platform;

the application platform is used for outputting the first identification voltage based on the trigger signal, identifying whether the SIM card is placed on the card seat or not based on the data signal output after the smart card receives the first identification voltage, and outputting an identification result to a system; when the application platform does not recognize the SIM card, the application platform outputs a control signal;

the power supply is connected with the application platform and used for carrying out power supply operation on the application platform;

the singlechip module is used for outputting the second identification voltage based on the control signal, and converting the data signal output after the intelligent card receives the second identification voltage into an identification signal;

the application platform is used for identifying whether the PSAM card is placed on the card holder or not based on the identification signal, and the application platform outputs an identification result to the system.

In the circuit capable of identifying two smart cards, the voltage transmission module comprises a first transmission unit, wherein the first transmission unit comprises a first input end, a first output end and a first control end, the first input end is used for receiving a first identification voltage, the first control end is connected with the first input end, and the first output end is connected with the card seat;

when the first input end receives the first identification voltage, the first identification voltage drives the first transmission unit to be conducted through the first control end, so that the first output end outputs the first identification voltage to the card seat.

In the circuit capable of identifying two smart cards, the first transmission unit comprises a first MOS tube and a first triode, wherein the drain electrode of the first MOS tube is connected with the first input end, the base electrode of the first triode is connected with the drain electrode of the first MOS tube, the collector electrode of the first triode is connected with the grid electrode of the first MOS tube, the emitter electrode of the first triode is grounded, and the source electrode of the first MOS tube is connected with the first output end.

In the circuit capable of identifying two smart cards, the voltage transmission module comprises a second transmission unit, the second transmission unit comprises a second input end, a second output end and a second control end, the single-chip microcomputer module comprises a power supply and a single-chip microcomputer chip, the power supply is used for outputting power supply voltage, the single-chip microcomputer chip is used for receiving the control signal, the single-chip microcomputer chip generates a driving signal based on the control signal, the second input end is connected with the power supply, the second output end is connected with the card seat, and the second control end is used for receiving the driving signal;

When the singlechip chip receives the control signal, the singlechip chip drives the second transmission unit to be conducted through the driving signal, the second transmission unit generates the second identification voltage based on the power supply voltage, and the second transmission unit outputs the second identification voltage to the card seat.

In the circuit capable of identifying two smart cards, the second transmission unit comprises a first transmission subunit, the first transmission subunit comprises a second MOS tube and a second triode, the base electrode of the second triode is connected with the second control end, the collector electrode of the second triode is connected with the grid electrode of the first MOS tube, the emitter electrode of the second triode is grounded, the source electrode of the second MOS tube is connected with the second input end, and the drain electrode of the second MOS tube is connected with the second output end, wherein the source electrode of the second MOS tube outputs the second identification voltage of 4.95V-5.05V based on the power voltage.

In the circuit capable of identifying two smart cards, the second transmission unit comprises a second transmission subunit, the second transmission subunit comprises a first buck chip, the first buck chip is used for carrying out buck operation on the power supply voltage to generate the second identification voltage, the first buck chip comprises a first buck chip input pin, a first buck chip enable pin and a first buck chip output pin, the first buck chip input pin is connected with the second input end, the first buck chip enable pin is connected with the second control end, and the first buck chip output pin is used for outputting the second identification voltage of 2.75V-2.85V;

The second transmission subunit comprises a third MOS tube and a third triode, wherein the base electrode of the third triode is connected with the output pin of the first buck chip, the collector electrode of the third triode is connected with the grid electrode of the third MOS tube, the emitting electrode of the third triode is grounded, the drain electrode of the third MOS tube is connected with the base electrode of the third triode, and the source electrode of the third MOS tube is connected with the second output end.

In the circuit capable of identifying two smart cards, the second transmission unit comprises a third transmission subunit, the third transmission subunit comprises a second buck chip, the second buck chip is used for carrying out buck operation on the power supply voltage to generate the second identification voltage, the second buck chip comprises a second buck chip input pin, a second buck chip enable pin and a second buck chip output pin, the second buck chip input pin is connected with the second input end, the second buck chip enable pin is connected with the second control end, and the second buck chip output pin is used for outputting the second identification voltage of 1.75V-1.85V;

the third transmission subunit comprises a fourth MOS tube and a fourth triode, wherein the base electrode of the fourth triode is connected with the output pin of the second buck chip, the collector electrode of the fourth triode is connected with the grid electrode of the fourth MOS tube, the emitting electrode of the fourth triode is grounded, the drain electrode of the fourth MOS tube is connected with the base electrode of the fourth triode, and the source electrode of the fourth MOS tube is connected with the second output end.

In the circuit capable of identifying two smart cards, the data switch module comprises a data switch chip, wherein the data switch chip comprises a multiplexing pin, a first output pin, a second output pin and a switching signal input pin, the multiplexing pin is connected with the card seat, and the multiplexing pin is used for receiving the data signals; the first output pin is connected with the application platform, and the second output pin is connected with the singlechip module;

the application platform is used for outputting the first switching signal and the second switching signal, the switching signal input pin is connected with the application platform, and the switching signal input pin is used for receiving the first switching signal and the second switching signal; when the data switch chip does not receive the switching signal, the data switch chip establishes communication with the application platform through the first output pin, so that the data switch module is used for outputting the data signal to the application platform, and when the data switch chip receives the switching signal, the data switch chip establishes communication with the singlechip module through the second output pin, so that the data switch module is used for outputting the data signal to the singlechip module.

In the circuit capable of identifying two smart cards, the model of the data switch chip is SGM44599.

An electronic device comprising a circuit as defined in any one of the above, which circuit recognizes two smart cards.

A smart card identification method, comprising:

the intelligent card is arranged on the card seat, and the card seat outputs a trigger signal;

based on the trigger signal, the application platform outputs a first identification voltage to the card seat through a voltage transmission module, and the application platform outputs a first switching signal to the data switch module;

based on the first identification voltage, the card seat outputs a data signal;

the data switch module outputs the data signal to the application platform based on the first switching signal;

the application platform identifies whether the SIM card is placed on the card seat or not based on the data signal;

when the application platform identifies the SIM card, the application platform outputs an identification result to a system;

when the application platform does not recognize the SIM card, the application platform outputs a control signal to the singlechip module, and the application platform outputs a second switching signal to the data switch module;

The singlechip module outputs a second identification voltage to the card seat based on the control signal;

based on the second identification voltage, the smart card outputs a data signal;

the data switch module outputs the data signal to the singlechip module based on the second switching signal;

the singlechip module converts the data signal into an identification signal;

the application platform is used for identifying whether the PSAM card is placed on the card holder or the unrecognizable card is placed on the card holder based on the identification signal, and the application platform outputs an identification result to the system.

In the smart card identification method, when the application platform outputs the first identification voltage, the application platform outputs the first identification voltage of 1.75V-1.85V to the card seat, and if the smart card fails to identify the first identification voltage of 1.75V-1.85V, the application platform outputs the first identification voltage of 2.75V-2.85V to the card seat;

when the singlechip module outputs the second identification voltage, the singlechip module outputs the second identification voltage of 1.75V-1.85V to the card seat, and if the intelligent card fails to identify the second identification voltage of 1.75V-1.85V, the singlechip module outputs the second identification voltage of 2.75V-2.85V to the card seat; if the smart card fails to recognize the second recognition voltage of 2.75V-2.85V, the singlechip module outputs the second recognition voltage of 4.95V-5.05V to the card seat.

Compared with the prior art, the utility model has the beneficial effects that: the utility model provides a circuit capable of identifying two smart cards, which comprises a card seat, a voltage transmission module, a data switch module, an application platform and a single chip microcomputer module. The smart card is placed on the card holder, and the card holder can output a trigger signal. Based on the trigger signal, the application platform outputs the first identification voltage to the card seat through the voltage transmission module, and the application platform outputs the first switching signal to the data switch module. Based on the first identification voltage, the cartridge outputs a data signal. The data switch module may then output the data signal to the application platform based on the first switching signal. Thus, the application platform recognizes whether the SIM card is placed in the card holder based on the data signal.

When the application platform identifies the SIM card, the application platform outputs the identification result to the system. When the application platform does not recognize the SIM card, the application platform outputs a control signal to the singlechip module. And the application platform outputs a second switching signal to the data switch module. Then, the singlechip module can output the second identification voltage to the card seat based on the control signal. Based on the second identification voltage, the smart card outputs a data signal. And based on the second switching signal, the data switch module outputs the data signal to the singlechip module. The singlechip module converts the data signal into an identification signal, and based on the identification signal, the application platform can identify that the card holder is used for placing a PSAM card or the card holder is used for placing a non-identifiable card. And the application platform outputs the identification result to the system. The user can set the circuit capable of identifying the two smart cards in one electronic device, so that the electronic device can identify the two smart cards. Thus, the electronic device can support the SIM card function and the PSAM card function at the same time of reducing the card holder. Furthermore, the electronic device can automatically realize the function of the corresponding smart card according to the card inserted by the customer at the time. Under the condition of one card seat, the electronic equipment effectively solves the technical problem that the existing whole product cannot support the read-write requirements of two smart cards.

Drawings

FIG. 1 is a block diagram of one embodiment of a circuit for identifying two smart cards according to the present utility model.

Fig. 2 is a circuit diagram of a first transmission unit of an embodiment of a circuit capable of identifying two kinds of smart cards according to the present utility model.

Fig. 3 is a circuit diagram of a second transmission unit according to an embodiment of the present utility model capable of identifying two kinds of smart cards.

Fig. 4 is a second circuit diagram of a second transmission unit of an embodiment of a circuit capable of identifying two kinds of smart cards according to the present utility model.

Fig. 5 is a third circuit diagram of a second transmission unit of an embodiment of a circuit capable of identifying two kinds of smart cards according to the present utility model.

Fig. 6 is a circuit diagram of a second transmission unit of an embodiment of a circuit capable of identifying two kinds of smart cards according to the present utility model.

Fig. 7 is a circuit diagram of a second transmission unit of an embodiment of a circuit capable of identifying two kinds of smart cards according to the present utility model.

Fig. 8 is a circuit diagram of a data switch module according to an embodiment of the present utility model capable of identifying two smart cards.

Fig. 9 is a circuit diagram of a single chip module according to an embodiment of the present utility model capable of identifying two kinds of smart cards.

In the figure, 10, a circuit that can identify two smart cards; 11. a clamping seat; 12. a voltage transmission module; 121. a first transmission unit; 1211. a first input; 1212. a first output terminal; 122. a second transmission unit; 1221. a second input terminal; 1222. a second output terminal; 1223. a second control end; 1224. a first transmission subunit; 1225. a second transmission subunit; 1226. a third transmission subunit; 13. a data switch module; 14. an application platform; 15. a singlechip module; 151. and a power supply.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms of directions used in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are used for explaining and understanding the present utility model only with reference to the orientation of the drawings, and are not intended to limit the present utility model.

The words "first," "second," and the like in the terminology of the present utility model are used for descriptive purposes only and are not to be construed as indicating or implying relative importance and not as limiting the order of precedence.

In the drawings, like structural elements are denoted by like reference numerals.

Referring to fig. 1, the present utility model provides a circuit 10 capable of identifying two kinds of smart cards, and the circuit 10 capable of identifying two kinds of smart cards is applied to an electronic device. The circuit 10 capable of identifying two smart cards comprises a card seat 11, a voltage transmission module 12, a data switch module 13, an application platform 14, a singlechip module 15 and a power supply. The card holder 11 is used for placing a smart card, and the card holder 11 is used for outputting a trigger signal. The power supply is connected to the application platform 14, and is used for performing power supply operation on the application platform. The voltage transmission module 12 is configured to output the first identification voltage provided by the application platform 14 to the card holder 11, or the voltage transmission module 12 outputs the second identification voltage provided by the singlechip module 15 to the card holder 11.

Referring to fig. 1 and 2, the voltage transmission module 12 includes a first transmission unit 121, and the first transmission unit 121 includes a first input end 1211, a first output end 1212, and a first control end. The first input terminal 1211 is configured to receive a first identification voltage, the first control terminal is connected to the first input terminal 1211, and the first output terminal 1212 is connected to the card holder 11. When the first input terminal 1211 receives the first identification voltage, the first identification voltage drives the first transmission unit 121 to be turned on through the first control terminal, so that the first output terminal 1212 outputs the first identification voltage to the card holder 11.

Referring to fig. 1 and 2, the first transmission unit 121 includes a first MOS transistor U1072 and a first triode Q1074, wherein a drain electrode of the first MOS transistor U1072 is connected to the first input end 1211, a base electrode of the first triode Q1074 is connected to a drain electrode of the first MOS transistor U1072, a collector electrode of the first triode Q1074 is connected to a gate electrode of the first MOS transistor, an emitter electrode of the first triode Q1074 is grounded, and a source electrode of the first MOS transistor U1072 is connected to the first output end 1212. The first transmission unit 121 further includes a first resistor R1713, a second resistor R1714, and a third resistor R1715, where one end of the first resistor R1713 is connected to the gate of the first MOS transistor U1072. The other end of the first resistor R1713 is connected to the source of the first MOS transistor U1072, and the resistance of the first resistor R1713 is 100kΩ. One end of the second resistor R1714 is connected with the base electrode of the first triode Q1074, one end of the second resistor R1714 is connected with the drain electrode of the first MOS tube U1072, and the resistance value of the second resistor R1714 is 4.7KΩ. One end of the third resistor R1715 is connected with the base electrode of the first triode Q1074, the other end of the third resistor R1715 is connected with the emitter electrode of the first triode Q1074, and the resistance value of the third resistor R1715 is 100KΩ.

Referring to fig. 1, 3 and 9, the voltage transmission module 12 includes a second transmission unit 122, and the second transmission unit 122 includes a second output terminal 1222, a second output terminal and a second control terminal 1223. The singlechip module 15 comprises a power supply 151 and a singlechip chip U1706, and the model of the singlechip chip U1706 is MS51TC0AE. The power supply 151 is used for outputting a power supply voltage, the singlechip chip U1706 is used for receiving a control signal, and the singlechip chip U1706 generates a driving signal based on the control signal. The second output end 1222 is connected to the power source 151, the second output end is connected to the card holder 11, and the second control end 1223 is configured to receive the driving signal.

When the singlechip chip U1706 receives the control signal, the singlechip chip U1706 drives the second transmission unit 122 to be conducted through the driving signal. Thus, the second transmission unit 122 may generate the second identification voltage based on the power supply voltage, and the second transmission unit 122 outputs the second identification voltage to the cartridge 11.

Referring to fig. 3, the second transmission unit 122 includes a first transmission subunit 1224, and the first transmission subunit 1224 includes a first transmission unit 121 including a second MOS transistor U1700 and a second transistor Q1702. The base of the second triode Q1702 is connected with the second control end 1223, the collector of the second triode Q1702 is connected with the grid electrode of the first MOS tube, and the emitter of the second triode Q1702 is grounded. The source of the second MOS transistor U1700 is connected to the second output 1222, and the drain of the second MOS transistor U1700 is connected to the second output 1222. The source of the second MOS transistor U1700 outputs a second identification voltage of 4.95V-5.05V based on the power supply voltage.

Referring to fig. 3, the first transmission subunit 1224 further includes a fourth resistor R1701, a fifth resistor R1703, a sixth resistor R1704, a first diode D1701, and a first capacitor C1709. One end of the fourth resistor R1701 is connected to the source of the second MOS tube U1700, the other end of the fourth resistor R1701 is connected to the gate of the second MOS tube U1700, and the resistance value of the fourth resistor R1701 is 100kΩ. The fifth resistor R1703 is connected to the base of the second triode Q1702, the fifth resistor R1703 is connected to the second control end 1223, and the resistance of the fifth resistor R1703 is 4.7kΩ. The sixth resistor R1704 is connected to the base of the second transistor Q1702, the sixth resistor R1704 is connected to the emitter of the second transistor, and the resistance of the sixth resistor R1704 is 100kΩ. The positive pole of first diode D1701 is connected first control end, and the negative pole of first diode D1701 is connected the source of second MOS pipe U1700. One end of the first capacitor C1709 is connected to the drain of the second MOS, and the other end of the first capacitor C1709 is grounded.

Referring to fig. 4 and 5, the second transmission unit 122 includes a second transmission subunit 1225. The second transmission sub-unit 1225 includes a first buck chip U1703, where the type of the first buck chip U1703 is ldo_sgm2031, and the first buck chip U1703 may perform a buck operation on the power supply voltage to generate the second identification voltage. The first buck chip U1703 includes a first buck chip input pin IN, a first buck chip enable pin EN, a first buck chip output pin OUT, the first buck chip input pin IN being connected to the second output 1222. The first buck chip enable pin EN is connected to the second control terminal 1223, and the first buck chip output pin OUT is configured to output a second identification voltage of 2.75V-2.85V.

Referring to fig. 4 and fig. 5, the second transmission subunit 1225 further includes a seventh resistor R1786, a second capacitor C1706, and a third capacitor C1705, where one end of the seventh resistor R1786 is connected to the first buck chip enable pin EN. The other end of the seventh resistor R1786 is grounded, and the resistance value of the seventh resistor R1786 is 47KΩ. One end of the second capacitor C1706 is connected with the input pin IN of the first buck chip, the other end of the second capacitor C1706 is grounded, and capacitance reactance of one end of the second capacitor C1706 is 1 mu F. One end of the third capacitor C1705 is connected with the output pin OUT of the first buck chip, the other end of the third capacitor C1705 is grounded, and the capacitance reactance of one end of the third capacitor C1705 is 1 mu F.

Referring to fig. 4 and 5, the second transmission subunit 1225 includes a third MOS transistor U1705 and a third transistor Q1705, where a base of the third transistor is connected to the output pin OUT of the first buck chip. The collector of the third triode Q1705 is connected with the grid electrode of the third MOS tube, and the emitter of the third triode Q1705 is grounded. The drain of the third MOS transistor U1705 is connected to the base of the third transistor Q1705, and the source of the third MOS transistor U1705 is connected to the second output 1222. The second transmission subunit 1225 further includes an eighth resistor R1713, a ninth resistor R1714, and a tenth resistor R1715, where one end of the eighth resistor R1713 is connected to the gate of the third MOS transistor. The other end of the eighth resistor R1713 is connected to the source of the third MOS transistor U1705, and the resistance value of the eighth resistor R1713 is 100deg.C. One end of the ninth resistor R1714 is connected with the drain electrode of the third MOS transistor U1705, the other end of the ninth resistor R1714 is connected with the base electrode of the third triode Q1705, and the resistance value of the ninth resistor R1714 is 4.7KΩ. One end of the tenth resistor R1715 is connected with the collector of the third triode Q1705, the other end of the tenth resistor R1715 is connected with the base of the third triode Q1705, and the resistance value of the ninth resistor R1714 is 100KΩ.

Referring to fig. 6 and 7, the second transmission unit 122 includes a third transmission subunit 1226. The third transmission subunit 1226 includes a second buck chip U1701, where the second buck chip U1701 is also of the type ldo_sgm2031. The second buck chip may perform a buck operation on the power supply voltage to generate a second identification voltage, and the second buck chip U1701 includes a second buck chip input pin IN, a second buck chip enable pin EN, a second buck chip output pin OUT, and the second buck chip input pin IN is connected to the second output terminal 1222. The second buck chip enable pin EN is connected to the second control terminal 1223, and the second buck chip output pin OUT is configured to output a second identification voltage of 1.75V-1.85V. The second transmission subunit 1225 further includes an eleventh resistor R1785, a fourth capacitor C1701, and a fifth capacitor C1700, where one end of the eleventh resistor R1785 is connected to the second buck chip enable pin EN. The other end of the eleventh resistor R1785 is grounded, and the resistance value of the eleventh resistor R1785 is 47KΩ. One end of the fourth capacitor C1701 is connected to the second buck chip input pin IN, the other end of the fourth capacitor C1701 is grounded, and the capacitance reactance of one end of the fourth capacitor C1701 is 1 μf. One end of the fifth capacitor C1700 is connected with the output pin OUT of the second buck chip, the other end of the fifth capacitor C1700 is grounded, and the capacitance reactance of one end of the fifth capacitor C1700 is 1 mu F.

Referring to fig. 6 and 7, the third transmission subunit 1226 includes a fourth MOS transistor U1704 and a fourth triode Q1703, wherein a base of the fourth triode Q1703 is connected to the output pin OUT of the second buck chip, a collector of the fourth triode is connected to the gate of the fourth MOS transistor U1704, an emitter of the fourth triode Q1703 is grounded, a drain of the fourth MOS transistor U1704 is connected to the base of the fourth triode Q1703, and a source of the fourth MOS transistor U1704 is connected to the second output end 1222. The third transmission subunit 1226 further includes a twelfth resistor R1707, a thirteenth resistor R1706, and a fourteenth resistor R1709, where one end of the twelfth resistor R1707 is connected to the gate of the fourth MOS transistor U1704. The other end of the twelfth resistor R1707 is connected with the source electrode of the fourth MOS tube U1704, and the resistance value of the twelfth resistor R1707 is 100KΩ. One end of the thirteenth resistor R1706 is connected with the drain electrode of the fourth MOS transistor U1704, the other end of the thirteenth resistor R1706 is connected with the base electrode of the fourth triode Q1703, and the resistance value of the thirteenth resistor R1706 is 4.7KΩ. One end of the fourteenth resistor R1709 is connected with the collector of the fourth triode Q1703, the other end of the fourteenth resistor R1709 is connected with the base of the fourth triode Q1703, and the resistance value of the fourteenth resistor R1709 is 100KΩ.

Referring to fig. 8, based on the first switching signal output by the application platform 14, the data switch module 13 outputs the data signal output by the card socket 11 to the application platform 14. Or based on the second switching signal output by the application platform 14, the data switch module 13 outputs the data signal to the single-chip microcomputer module 15. The data switch module 13 includes a data switch chip U1710, where the data switch chip U1710 has a model SGM44599, and the data switch chip U1710 includes a multiplexing pin, a first output pin, a second output pin, and a switching signal input pin sim_psam_sw. The multiplexing pin is connected with the card seat 11, and the multiplexing pin is used for receiving the data signal. The multiplexing pins comprise a COM1 pin, a COM2 pin and a COM3 pin. The COM1 pin is used for receiving clock information in the data signal, the COM2 pin is used for receiving time reset information in the data signal, and the COM3 pin is used for receiving data information in the data signal.

Referring to fig. 8, the first output pin is connected to the application platform 14, and the second output pin is connected to the single-chip microcomputer module 15, so that the data switch chip U1710 can transmit data signals to the application platform 14 or the single-chip microcomputer module 15. The first output pin comprises a SIM2_SCLK pin, a SIM2_SRST pin and a SIM2_SIO pin, and the second output pin comprises a PSAM_CLK_IO pin, a PSAM_RST_IO pin and a PSAM_DAT_IO pin. And, the sim2_sclk pin is used for outputting clock information in the data signal, the sim2_srst pin is used for outputting time reset information in the data signal, and the sim2_sio pin is used for receiving data information in the data signal.

Referring to fig. 8, the data switch chip U1710 further includes a v+ pin, and the v+ pin is connected to the power source 151. The data switch module 13 further includes a sixth capacitor, and one end of the sixth capacitor C1710 is connected. The other end of the sixth capacitor C1710 is grounded, and the capacitance of the sixth capacitor C1710 is 1 μf. The data switch chip U1710 further includes a GND pin and a PAD pin, both of which are grounded. The data switch chip U1710 includes an input pin connected to the card holder 11, and the input pin is used for receiving a data signal output from the card holder 11.

The application platform 14 may output a first switching signal and a second switching signal, and a switching signal input pin is connected to the application platform, and the switching signal input pin sim_psam_sw may receive the first switching signal and the second switching signal. When the data switch chip U1710 does not receive the switching signal, the data switch chip U1710 establishes communication with the application platform 14 through the first output pin, so that the data switch module 13 is used to output the data signal to the application platform 14. When the data switch chip U1710 receives the switching signal, the data switch chip U1710 establishes communication with the single-chip microcomputer module 15 through the second output pin, so that the data switch module 13 is configured to output the data signal to the single-chip microcomputer module 15.

Referring to fig. 1, the application platform 14 may output a first identification voltage based on the trigger signal. And, based on the data signal output after the smart card receives the first identification voltage, the application platform 14 can identify whether the SIM card is placed on the card holder 11. The whole name of the SIM card is Subscriber Identity Module, the SIM card is called as an electronic equipment card in common name. The SIM card is inserted into the mobile terminal equipment, so that the communication function of the equipment, namely, communication and surfing can be realized. Moreover, the application platform 14 may output the recognition result to the system. When the application platform 14 does not recognize the SIM card, the application platform 14 outputs a control signal. Wherein the application platform 14 is MT6762 or MT6357.

Referring to fig. 1 and 9, the single chip module 15 may output the second identification voltage based on the control signal. And, the singlechip module 15 converts the data signal output after the smart card receives the second identification voltage into an identification signal. Based on the identification signal, the application platform 14 may identify that the card holder 11 is holding a PSAM card or that the card holder 11 is holding a non-identifiable card. And, the application platform 14 outputs the recognition result to the system. In this process, the singlechip module 15 needs to support the ISO7816 hardware interface and the physical protocol, and sends the raw data to the application app of the application platform 14 through the universal asynchronous receiver transmitter after packaging. Thus, the application platform 14 can recognize and issue instructions, and the singlechip mainly realizes control of the power supply 151 and data transparent transmission. The PSAM card is named Purchase Secure Access Module, and the Chinese name is 'POS terminal secure access module'. The PSAM is mainly embedded in the terminal equipment to play a role in safety protection, and the PSAM card also has a calculation function. The PSAM card can encrypt data information and is more applied to the fields of finance, enterprise management and the like.

Referring to fig. 9, the monolithic chip U1706 includes a psam_clk pin, a psam_dat pin, and a psam_rst pin. The PSAM_CLK pin is connected to the PSAM_CLK_IO pin and the PSAM_RST pin is connected to the PSAM_RST_IO pin. The PSAM_DAT pin is connected with the PSAM_DAT_IO pin, and the PSAM_CLK pin, the PSAM_DAT pin and the PSAM_RST pin are all used for receiving data signals. Wherein the psam_clk pin is used to receive clock information in the data signal. The PSAM_RST pin is used for receiving time reset information in the data signal, and the PSAM_DAT pin is used for receiving data information in the data signal. The monolithic chip U1706 also includes an MS51_RXD_H pin, an MS51_TXD_H pin, and an MS51_RXD_H pin and an MS51_TXD_H pin both connected to the application platform 14, the MS51_RXD_H pin and the MS51_TXD_H pin for outputting an identification signal.

Referring to fig. 9, the monolithic chip U1706 includes a psam_1v8_en pin, a psam_2v8_en pin, and a psam_5v_en pin. Psam_1v8_en is used for outputting a voltage of 1.8V, voltage output pin psam_2v8_en is used for outputting a voltage of 2.8V, and voltage output pin psam_5v_en is used for outputting a voltage of 5V. The monolithic chip U1706 includes a P2.3 pin, and the P2.3 pin is used for receiving a control signal. The monolithic chip U1706 also includes a VSS pin that is grounded. The monolithic chip U1706 further includes a VDD pin, a P1.6 pin, and a P0.2 pin, and the monolithic module 15 further includes a seventh capacitor C1723, a first TVS diode TVS1700, and a second TVS diode TVS1706. The VDD pin is connected to the power source 151, and one end of the seventh capacitor C1723 is connected to the VDD pin. The other end of the seventh capacitor C1723 is grounded, and the capacitance reactance of the seventh capacitor C1723 is 1 μF. One end of the first TVS diode TVS1700 is connected to the P0.2 pin, and the other end of the first TVS diode TVS1700 is grounded. One end of the second TVS diode TVS1706 is connected to the P1.6 pin, and the other end of the second TVS diode TVS1706 is grounded.

Referring to fig. 9, the monolithic chip U1706 further includes a P2.0 pin. The P2.0 pin is connected to the power source 151, and the singlechip module 15 further includes a fifteenth resistor R1702 and a sixteenth resistor R1708. One end of the fifteenth resistor R1702 is connected to the P2.0 pin, and the other end of the fifteenth resistor R1702 is connected to the power source 151. One end of the sixteenth resistor R1708 is connected to the P2.3 pin, and the other end of the sixteenth resistor R1708 is connected to the application platform 14. The single chip microcomputer module 15 further includes an eighth capacitor C1702 and a third TVS diode TVS1705, one end of the eighth capacitor C1702 is connected to the P2.0 pin, and the other end of the eighth capacitor C1702 is grounded. The capacitance of the eighth capacitor C1702 is 1 μf, and a third TVS diode TVS1705 is connected in parallel with the eighth capacitor C1702.

The working principle of the utility model is as follows:

the smart card is placed on the card holder 11, so that the card holder 11 can output a trigger signal. Based on the trigger signal, the application platform 14 outputs a first identification voltage of 1.75V-1.85V to the card holder 11 through the voltage transmission module 12. And, the application platform 14 outputs the first switching signal to the data switch module 13. Based on the first identification voltage of 1.75V-1.85V, the cartridge 11 may output a data signal. Subsequently, the data switch module 13 may output the data signal to the application platform 14 based on the first switching signal. The application platform 14 may then identify based on the data signal that the cartridge 11 has placed a SIM card. The application platform 14 then outputs the recognition result to the system. Subsequently, the smart card identification process ends.

If the smart card fails to recognize the first recognition voltage of 1.75V-1.85V, the application platform 14 outputs the first recognition voltage of 2.75V-2.85V to the card holder 11. Based on the first identification voltage of 2.75V-2.85V, the cartridge 11 may output a data signal. The data switch module 13 may then output the data signal to the application platform 14. The application platform 14 may then identify based on the data signal that the cartridge 11 has placed a SIM card. The application platform 14 then outputs the recognition result to the system. Subsequently, the smart card identification process ends. The above identification procedure conforms to the ISO7816 protocol, and the SOC of the application platform 14 has a default identification procedure. Because of the non-consultable and modifiable nature of SOC software, this process is not engaged and not disturbed.

When the application platform 14 does not recognize the SIM card through the above process, the application platform 14 outputs a control signal to the singlechip module 15. And, the application platform 14 outputs the second switching signal to the data switch module 13. Based on the control signal, the singlechip module 15 outputs a second identification voltage of 1.75V-1.85V to the card seat 11. Based on the second identification voltage of 1.75V-1.85V, the smart card may output a data signal. The data switch module 13 may output the data signal to the singlechip module 15 based on the second switching signal. The single-chip module 15 then converts the data signal into an identification signal. Then, based on the identification signal, the application platform 14 can identify that the card holder 11 is placed with a PSAM card. The application platform 14 then outputs the recognition result to the system. Subsequently, the smart card identification process ends.

If the smart card fails to recognize the first recognition voltage of 1.75V-1.85V, the singlechip module 15 outputs the second recognition voltage of 2.75V-2.85V to the card seat 11. Based on the second identification voltage of 2.75V-2.85V, the cartridge 11 may output a data signal. Subsequently, the data switch module 13 may output the data signal to the single-chip microcomputer module 15, and the single-chip microcomputer module 15 may convert the data signal into the identification signal. Based on the identification signal, the application platform 14 may identify that the cartridge 11 has a PSAM card placed. The application platform 14 then outputs the recognition result to the system. Subsequently, the smart card identification process ends.

If the smart card fails to recognize the first recognition voltage of 2.75V-2.85V, the singlechip module 15 outputs the second recognition voltage of 4.95V-5.05V to the card seat 11. Based on the second identification voltage of 4.95V-5.05V, the cartridge 11 may output a data signal. Subsequently, the data switch module 13 may output the data signal to the single-chip microcomputer module 15, and the single-chip microcomputer module 15 may convert the data signal into the identification signal. Based on the identification signal, the application platform 14 may identify that the cartridge 11 has a PSAM card placed. The application platform 14 then outputs the recognition result to the system. Subsequently, the smart card identification process ends.

If the application platform 14 also fails to recognize the smart card placed on the card holder 11 based on the identification signal, the application platform 14 can determine that the card holder 11 is placed with a non-identifiable card. The application platform 14 may then output the recognition result to the system. Subsequently, the smart card identification process ends.

The utility model provides a circuit capable of identifying two smart cards, which comprises a card seat, a voltage transmission module, a data switch module, an application platform and a single chip microcomputer module. The smart card is placed on the card holder, and the card holder can output a trigger signal. Based on the trigger signal, the application platform outputs the first identification voltage to the card seat through the voltage transmission module, and the application platform outputs the first switching signal to the data switch module. Based on the first identification voltage, the cartridge outputs a data signal. The data switch module may then output the data signal to the application platform based on the first switching signal. Thus, the application platform recognizes whether the SIM card is placed in the card holder based on the data signal.

In summary, although the present utility model has been described in terms of the preferred embodiments, the preferred embodiments are not limited to the above embodiments, and various modifications and changes can be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model is defined by the appended claims.

Claims

1. A circuit for identifying two smart cards, comprising

2. The circuit for identifying two smart cards according to claim 1, wherein the voltage transmission module comprises a first transmission unit, the first transmission unit comprises a first input end, a first output end and a first control end, the first input end is used for receiving the first identification voltage, the first control end is connected with the first input end, and the first output end is connected with the card holder;

3. The circuit of two kinds of smart cards according to claim 2, wherein the first transmission unit comprises a first MOS transistor and a first triode, a drain electrode of the first MOS transistor is connected to the first input terminal, a base electrode of the first triode is connected to a drain electrode of the first MOS transistor, a collector electrode of the first triode is connected to a gate electrode of the first MOS transistor, an emitter electrode of the first triode is grounded, and a source electrode of the first MOS transistor is connected to the first output terminal.

4. The circuit capable of identifying two smart cards according to claim 1, wherein the voltage transmission module comprises a second transmission unit, the second transmission unit comprises a second input end, a second output end and a second control end, the single-chip microcomputer module comprises a power supply and a single-chip microcomputer chip, the power supply is used for outputting power supply voltage, the single-chip microcomputer chip is used for receiving the control signal, the single-chip microcomputer chip generates a driving signal based on the control signal, the second input end is connected with the power supply, the second output end is connected with the card seat, and the second control end is used for receiving the driving signal;

5. The circuit of two kinds of smart cards according to claim 4, wherein the second transmission unit includes a first transmission subunit, the first transmission subunit includes a second MOS transistor and a second triode, a base electrode of the second triode is connected to the second control end, a collector electrode of the second triode is connected to a gate electrode of the first MOS transistor, an emitter electrode of the second triode is grounded, a source electrode of the second MOS transistor is connected to the second input end, and a drain electrode of the second MOS transistor is connected to the second output end, wherein the source electrode of the second MOS transistor outputs the second identification voltage of 4.95V-5.05V based on the power supply voltage.

6. The circuit of two kinds of smart cards according to claim 4, wherein the second transmission unit includes a second transmission subunit, the second transmission subunit includes a first buck chip for performing a buck operation on the power supply voltage to generate the second identification voltage, the first buck chip includes a first buck chip input pin, a first buck chip enable pin, a first buck chip output pin, the first buck chip input pin is connected to the second input terminal, the first buck chip enable pin is connected to the second control terminal, and the first buck chip output pin is used for outputting the second identification voltage of 2.75V-2.85V;

7. The circuit of two kinds of smart cards according to claim 4, wherein the second transmission unit includes a third transmission subunit, the third transmission subunit includes a second buck chip, the second buck chip is configured to perform a buck operation on the power supply voltage to generate the second identification voltage, the second buck chip includes a second buck chip input pin, a second buck chip enable pin, and a second buck chip output pin, the second buck chip input pin is connected to the second input terminal, the second buck chip enable pin is connected to the second control terminal, and the second buck chip output pin is configured to output the second identification voltage of 1.75V to 1.85V;

8. The circuit of claim 1, wherein the data switch module comprises a data switch chip, the data switch chip comprises a multiplexing pin, a first output pin, a second output pin, and a switching signal input pin, the multiplexing pin is connected with the card holder, and the multiplexing pin is used for receiving the data signal; the first output pin is connected with the application platform, and the second output pin is connected with the singlechip module;

9. A circuit for identifying two smart cards as defined in claim 8, wherein said data switch chip is of SGM44599 type.

10. An electronic device comprising a circuit as claimed in any one of claims 1-9 for identifying two smart cards.