JPH1125232A - Ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a general-purpose IC card which can be instantaneously used only by setting the IC card at an external device according to the specification of the external device whether a contact system and a radio system, without requiring any operation by a user. SOLUTION: This IC card is provided with a contact part 2 for contact which can be brought into contact with a card reader/writer 100 being an external device, a radio transmitting and receiving part 30 for operating transmission and reception by radio with the card reader/writer 100, and a data processing part 10 for operating a data processing by access to the card reader/writer 100 through the contact part 2 for contact or the radio transmitting and receiving part 30. In this case, a contact mode using the contact part 2 for contact and a radio mode using the radio transmitting and receiving part 30 are selectively set according to the receiving state of the radio transmitting and receiving part 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a portable electronic device, so-called IC card.

[0002]

2. Description of the Related Art A portable electronic device in which an integrated circuit is incorporated in a card, a so-called IC card, performs various data processing while mutually transferring data with a card reader / writer. As a method of data transfer, there is a contact method in which the data is transferred through a mechanical contact.

In the case of the contact type, supply of operating power supply voltage from a card reader / writer, GND connection, supply of a clock signal,
All of the reset signal supply, data transfer, and data transfer to the card reader / writer are performed through the contacts.

[0004]

In the case of a contact type IC card, a contact failure is likely to occur. To cope with this problem, a wireless (contactless) IC card has been proposed. This means that data transfer with the card reader / writer is performed wirelessly, and power supply voltage for operation from the card reader / writer is also received wirelessly.
Practical with no fear of contact failure.

[0005] However, if all of the IC cards are of the wireless type, a card reader / writer compatible with a contact type IC card cannot be used, and the versatility is impaired.

[0006] The present invention has been made in view of the above circumstances,
Its purpose is to set it to an external device without any user operation, and to be versatile to use it immediately in accordance with the specifications of the external device in either contact type or wireless type. It is to provide an excellent IC card.

[0007]

Means for Solving the Problems First Invention (Claim 1)
The IC card has a contact transmitting / receiving unit for transmitting / receiving by contact with an external device, a wireless transmitting / receiving unit for transmitting / receiving wirelessly to / from the external device, and performing data processing by accessing the external device via the contact unit or the wireless transmitting / receiving unit. A wireless communication mode using a contact transmission / reception unit and a wireless mode using a wireless transmission / reception unit are selectively set according to the reception state of the wireless transmission / reception unit.

[0008] The IC card of the second invention (claim 2) is
In the first invention, the contact transmitting / receiving section is provided so as to be exposed on the card body. IC of the third invention (claim 3)
The card according to the first invention further includes a modem unit interposed between the wireless transmission / reception unit and the data processing unit when setting the wireless mode to perform data modulation / demodulation and communication protocol setting.

The IC card according to a fourth invention (claim 4) is:
In the third invention, the modem section sets a communication protocol in accordance with a signal from the data processing section. An IC card according to a fifth invention (claim 5) is the IC card according to the third invention,
The modem unit sets half-duplex communication or full-duplex communication according to a signal from the data processing unit.

[0010] An IC card according to a sixth invention (claim 6) is
In the first invention, the wireless transmission / reception unit wirelessly receives the operating power supply voltage of the IC card from the external device. In the IC card according to a seventh aspect (claim 7), in the sixth aspect, the mode setting means sets a contact mode using the contact transmitting / receiving section when the operating power supply voltage is not received by the wireless transmitting / receiving section. When the power supply voltage for operation is received by the wireless transmission / reception unit, a wireless mode using the wireless transmission / reception unit is set.

According to an eighth aspect of the present invention, there is provided an IC card comprising:
A seventh aspect of the present invention further includes a modem unit interposed between the wireless transmission / reception unit and the data processing unit for setting data communication mode and a communication protocol when the wireless mode is set.

According to a ninth aspect of the present invention, there is provided an IC card comprising:
In the eighth invention, the modem section sets a communication protocol in accordance with a signal from the data processing section. In an IC card according to a tenth aspect of the present invention, in the ninth aspect, the modem unit sets half-duplex communication or full-duplex communication in accordance with a signal from the data processing unit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, reference numeral 1 denotes an IC card (card body) which can be set and reset with respect to a card reader / writer 100 which is an external device. The IC card 1 has a contact contact portion 2 exposed and provided on the outer peripheral surface of a main body as a contact transmitting / receiving portion for performing transmission / reception by contact with an external device. Transceiver 3
0 is built in.

The data processing unit 10 includes a CPU 11, a ROM
12, a RAM 13, and an EEPROM 14,
By accessing the card reader / writer 100 via the interface circuit 20 and the contact section 2 for contact, or
By accessing the card reader / writer 100 via the interface circuit 20 and the wireless transmission / reception unit 30, predetermined data processing is performed.

The wireless transmission / reception unit 30 is a card reader / writer
It performs wireless transmission and reception with the antenna 100 and includes antennas (coupling coils) 31 and 32, rectifier circuits 33 and 34, a voltage adjustment circuit 35, and waveform shaping circuits 36 and 37.

The card reader / writer 100 includes transmission / reception antennas (coupling coils) 101 and 102, and can transmit a carrier wave of a PSK-modulated data signal to the IC card 1.

The card reader / writer 100 is connected to a host computer 120 via a communication line 110, and operates under the control of the host computer 120. That is, when the card reader / writer 100 receives the carrier wave of the data signal from the IC card 1, the card reader / writer 100 demodulates the data signal and transmits it to the host computer via the communication line 110.
Send to 120. The host computer 120 performs various processes on the received data. The transmission data from the host computer 120 is sent to the card reader / writer 100 via the communication line 110. Card reader / writer 10
“0” PSK-modulates the received data and transmits the carrier to the IC card 1.

Transmission and reception of data and the like between the card reader / writer 100 and the IC card 1 is performed by a high-frequency magnetic field generated by a change in load on the antennas 101 and 102 of the card reader / writer 100 or the antennas 31 and 32 of the IC card 1. Is received by the antenna on the receiving side.

From the card reader / writer 100 to the IC card 1
When receiving data or the like, the antennas 101 and 102 of the card reader / writer 100
A high-frequency magnetic field whose phase is shifted by 90 degrees is given to each of the carriers 32. As a result, the antennas 31, 3
In each of the two, an induced voltage and an induced current of alternating current having phases shifted from each other by 90 degrees are generated by electromagnetic induction.

Each of the antennas 31 and 32 has a rectifier circuit 3
The AC voltage generated at the antennas 31 and 32 is rectified by the rectifier circuits 33 and 34 to become a DC voltage.

The output voltages of the rectifier circuits 33 and 34 are input to a voltage adjusting circuit 35, where the output voltages are adjusted to a constant voltage to become the operating power supply voltage VDD of the IC card 1. The rectifier circuits 33 and 34 are provided with the voltage adjustment circuit 35.
When the output voltage of the IC card 1 fluctuates greatly due to the state of the magnetic coupling between the antennas 31 and 32, the internal circuit of the IC card 1 cannot be operated stably.
In order to prevent such a problem, a voltage adjusting circuit 35 is provided to obtain a constant operating power supply voltage VDD.

The carrier wave φ1x received by the antenna 31 is taken out as a constant output current by the rectifier circuit 33, and this output current is inputted to the waveform shaping circuit 36, and the pulse-like clock signal CLK1 whose rounded waveform has been neatly shaped is obtained. Becomes

The received carrier wave φ2x in the coupling coil 32 is taken out as a constant output current by the rectifier circuit 34, and this output current is inputted to the waveform shaping circuit 37, and a pulse-like clock signal whose rounded waveform has been finely shaped is obtained. CLK2. Note that the phases of the clock signals CLK1 and CLK2 are shifted from each other by 90 degrees.

The voltage adjusting circuit 35 further generates a reset signal for resetting the CPU 11 and the interval circuit 20 of the data processing unit 10 and releasing the reset state. That is, the reset signal resets the CPU 11 and the interval circuit 20 when the operation power supply voltage VDD becomes lower than a voltage level (operation guarantee voltage level) at which the operation of the internal circuit of the IC card 1 can be guaranteed. When the internal circuit of the card 1 becomes higher than the operable voltage level, the CPU 1
This is for releasing the reset state of the interval circuit 1 and the interval circuit 20, and has a hysteresis characteristic between the reset point and the reset release point.

The operating power supply voltage VDD and the clock signal CLK output from the wireless transmitting / receiving section 30 having the above-described configuration.
1. The clock signal CLK2 and the reset signal are supplied to the interface circuit 20, and the wireless transmission / reception unit 30 and the interface circuit 20 are connected to GND. In addition, the wireless transmission / reception unit 3
The modulated transmission data is supplied to 0, which is transmitted from the antenna 32 to the outside via the rectifier circuit 34.

Further, the operating power supply voltage VDD, the clock signal, and the reset signal output from the interface circuit 20 are supplied to the data processing unit 10,
The interface circuit 20 and the data processing unit 10 are connected to GND.
Connected. Further, data transmission and reception are performed between the interface circuit 20 and the data processing unit 10.

The interface circuit 20 changes the contact mode using the contact contact section 2 and the wireless mode using the wireless transmitting / receiving section 30 to the receiving state of the wireless transmitting / receiving section 30 (the receiving state of the operating power supply voltage VDD). A mode setting unit 21 for selectively setting the data is provided between the wireless transmission / reception unit 30 and the data processing unit 10 when the wireless mode is set. And a modem unit 22 for making settings such as duplex communication and communication speed.

FIG. 1 shows a specific configuration of the interface circuit 20. First, the mode setting unit 21 includes a power supply voltage switching circuit 40, a clock signal switching circuit 50, a reset signal switching circuit 60, and a data switching circuit 70.

The power supply voltage switching circuit 40 is a reset circuit to which switching elements such as an NPN transistor 41, a smoothing capacitor 42, and a reset signal (responding to the level of the operating power supply voltage VDD) from the voltage adjusting circuit 35 are input. 43, when the level of the operation power supply voltage VDD is lower than a predetermined value (operation guarantee voltage level), the output voltage of the reset circuit 43 becomes low level and the transistor 41 is turned off. The transmission of the operation power supply voltage VDD to the data processing unit 10 is interrupted, and when the level of the operation power supply voltage VDD becomes equal to or higher than a predetermined value, the output voltage of the reset circuit 43 becomes a high level and the transistor 41 is turned on. Wireless transceiver 30
From the power supply voltage VDD for operation to the data processing unit 10.

A power supply voltage terminal (VDD) of the contact section 2 is connected to a line connecting the output terminal of the power supply voltage switching circuit 40 and the data processing section 10. The clock signal switching circuit 50 converts a clock signal externally input to a clock signal terminal (CLK) of the three-state buffer 51 for transmitting a clock signal from the modem unit 22 to the data processing unit 10 and a clock signal terminal (CLK) of the contact unit 2 for contact. When the output voltage of the reset circuit 43 in the power supply voltage switching circuit 40 is low, the buffer 51 is turned off and the buffer 52 is turned on, and the reset circuit 43 is turned on. Becomes high level, the buffer 51 turns on and the buffer 52 turns off.

The reset signal switching circuit 60 is connected to the modem 2
A three-state buffer 61 for transmitting the reset signal from the data processing unit 10 to the data processing unit 10, and a three-state buffer 61 for transmitting a reset signal externally input to the reset signal terminal (RST) of the contact unit 2 to the data processing unit 10. When the output voltage of the reset circuit 43 is low, the buffer 61 is turned off and the buffer 62 is turned on. When the output voltage of the reset circuit 43 is high, the buffer 61 is turned on and the buffer 61 is turned on. 62 turns off.

The data switching circuit 70 includes a reset circuit 43
Output voltage, a reception enable signal from the modem unit 22,
An AND circuit 71 which receives three of the received data from the modem unit 22 (only the received data is inverted); an NPN transistor 73 whose output is applied between the base and the emitter via a resistor 72; The transistor 73 comprises a resistor 74 for applying a DC voltage Vdd between the collector and the emitter of the transistor 73, and a protocol setting three-state buffer 75 connected to the collector of the transistor 73. Data processing is performed using the collector voltage of the transistor 73 as received data. The buffer 75 is connected to a transmission data supply path from the data processing unit 10 to the modem unit 22, and the buffer 75 is turned on and off according to a protocol setting signal from the modem unit 22. It is a configuration to do.

That is, if the output voltage of the reset circuit 43 is at a high level (operation power supply voltage VDD reception) and the reception enable signal from the modem unit 22 is at a high level (reception permission), reception from the modem unit 22 is performed. The output of the AND circuit 71 changes in level according to the data, and the transistor 73 turns on and off according to the level change. A change in the collector voltage of the transistor 73 based on the on / off operation is supplied to the data processing unit 10 as received data.
At this time, if the protocol setting signal is at a high level (full duplex communication), the buffer 75 is turned off and its output terminal becomes high impedance, so that the transmission data from the data processing unit 10 is transmitted to the modem unit 22 as it is. Supplied.

The data terminal (DATA) of the contact section 2 is connected to a reception data supply line between the collector of the transistor 73 and the data processing section 10. further,
Another data terminal (DATA) of the contact part 2 is connected to a transmission data supply line between the output terminal of the buffer 75 and the modem part 22.

It is to be noted that two lines of a reception data supply line from the collector of the transistor 73 to the data processing unit 10 and a transmission data supply line from the data processing unit 10 to the modem unit 22 via the output terminal of the buffer 75. Is prepared, but the data processing unit 10
This is a configuration for performing heavy communication. If the data processing unit 10 performs half-duplex communication, the line connecting the collector of the transistor 73 and the data processing unit 10 is used not only as a reception data supply line but also as a transmission data supply line.

That is, in the case of the half-duplex communication, the protocol setting signal is set to the low level, the buffer 75 is turned on, and the transmission data from the data processing unit 10 is transmitted to the buffer 75.
Is supplied to the modem unit 22 through At this time, in response to receiving the transmission data, the modem unit 22 performs control using the reception enable signal. In other words, received data (state)
When there is no, the reception enable signal is forcibly set to the low level, and the output of the AND circuit 71 is maintained at the low level. As a result, the transistor 73 is maintained in the off state, and the transmission data is reliably supplied from the data processing unit 10 to the modem unit 22 through the buffer 75. When the supply of the transmission data is completed, the modem unit 22 outputs the reception data from the reception data output terminal. The transistor 73 is turned on and off according to the output of the received data. A change in the collector voltage of the transistor 73 based on the on / off operation is supplied to the data processing unit 10 as received data.

On the other hand, the modem unit 22 performs data modulation / demodulation, generation of a reception enable signal, and the like.
1 and a protocol setting unit 82 for setting a communication protocol and the like.

That is, the data control unit 81 demodulates (extracts) data from the clock signals CLK1 and CLK2, fetches it as received data, and
Is modulated and output to the radio transmitting / receiving unit 30 and the reception enable signal is set to a high level when reception is permitted.

The protocol setting unit 82 includes a data processing unit 1
Based on the ATR signal included in the transmission data supplied from 0, full-duplex communication or half-duplex communication is set as the communication protocol. When setting full duplex communication, the protocol setting signal is set to high level, and when setting half duplex communication, the protocol setting signal is set to low level.

Next, the operation of the above configuration will be described. I
When the C card 1 is set in the card reader / writer 100, if the card reader / writer 100 is of wireless specification, wireless communication is performed between the card reader / writer 100 and the IC card 1. The wireless communication includes the supply of the operating power supply voltage VDD from the card reader / writer 100 to the interface 20.

If the level of the operating power supply voltage VDD is equal to or higher than a predetermined value, the output voltage of the reset circuit 43 in the interface circuit 20 becomes high and the transistor 4
1 turns on. When the transistor 41 is turned on, the operating power supply voltage VDD is transmitted to the data processing unit 10.

Also, the buffer 51 of the clock signal switching circuit 50 is turned on (the buffer 52 is turned off) and the buffer 61 of the reset signal switching circuit 60 is turned on by the high level output of the reset circuit 43 (reception of the operating power supply voltage VDD). (The buffer 62 is turned off) and the data switching circuit 7
0 works effectively. Thus, the data processing unit 10 is connected to the wireless transmitting / receiving unit 30 via the interface circuit 20, and the wireless mode using the wireless transmitting / receiving unit 30 is set. That is, in the wireless mode, access is made between the data processing unit 10 and the card reader / writer 100 via the wireless transmission / reception unit 30, and predetermined data processing is executed.

On the other hand, the IC card 1 is a card reader / writer
When set for 100, the card reader / writer 10
If 0 is a contact specification, the contact contact portion 2 of the IC card 1 comes into contact with the contact contact portion of the card reader / writer 100 to conduct electricity. With this conduction, the card reader / writer
Wire communication is performed between the interface circuit 100 and the interface circuit 20. The wired communication includes the supply of the operation power supply voltage VDD from the card reader / writer 100 to the interface 20, and the operation power supply voltage VDD is supplied to the data processing unit 10 as it is.

In this case, the power supply voltage VD for wireless operation is used.
Since there is no supply of D, the output voltage of the reset circuit 43 in the interface circuit 20 maintains a low level. As a result, the buffer 52 of the clock signal switching circuit 50 turns on (the buffer 51 turns off), and the buffer 62 of the reset signal switching circuit 60 turns on (the buffer 61 turns off). The data switching circuit 70 does not operate. Thus, the data processing unit 10 is connected to the contact contact unit 2 via the interface circuit 20, and the contact mode using the contact contact unit 2 is set. That is, in the contact mode, the data processing unit 10 and the card reader / writer 100 are accessed via the contact contact unit 2, and predetermined data processing is executed.

As described above, the user only needs to set the IC card 1 in the card reader / writer 100 without any operation by the user. Can be used immediately. The versatility of the IC card 1 is improved.

The interface circuit 20 automatically determines whether the data processing unit 10 mounted on the IC card 1 performs full-duplex communication or half-duplex communication and changes the communication protocol. Since the setting is made, adaptation to various IC cards is possible, and in this respect also, the versatility is excellent. The present invention is not limited to the above embodiment, and various modifications can be made without changing the gist.

[0047]

As described above, according to the present invention, a contact transmitting / receiving unit for transmitting / receiving by contact with an external device,
A wireless transmission / reception unit that performs wireless transmission / reception with an external device; a data processing unit that performs data processing by accessing the external device via the contact unit or the wireless transmission / reception unit; A mode setting means for selectively setting a wireless mode using the transmission / reception unit in accordance with a reception state of the wireless transmission / reception unit; In addition, it is possible to provide a highly versatile IC card that can be used immediately according to the specifications of an external device in either a contact type or a wireless type.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a specific configuration of an interface circuit according to one embodiment.

FIG. 2 is a block diagram showing a configuration of the embodiment and a configuration of an external device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... IC card 2 ... Contact contact part 10 ... Data processing part 20 ... Interface circuit 21 ... Mode setting part 22 ... Modem part 30 ... Wireless transmission / reception part 40 ... Power supply voltage switching circuit 50 ... Clock signal switching circuit 60 ... Reset signal Switching circuit 70: Data switching circuit 100: Card reader / writer (external device)

Claims (10)

[Claims] 1. A contact transmitting / receiving unit for performing transmission / reception by contact with an external device, a wireless transmitting / receiving unit for performing wireless transmission / reception to / from an external device, and the external device via the contact transmitting / receiving unit or the wireless transmitting / receiving unit. A data processing unit for performing data processing by access; and a mode setting means for selectively setting a contact mode using the contact transmitting / receiving unit and a wireless mode using the wireless transmitting / receiving unit in accordance with a reception state of the wireless transmitting / receiving unit. An IC card comprising: 2. The method according to claim 1, wherein the contact transmitting / receiving section is provided so as to be exposed on the card body.
C card. 3. A wireless communication apparatus according to claim 2, further comprising a modem unit interposed between said wireless transmission / reception unit and said data processing unit to set data modulation / demodulation and setting a communication protocol when said wireless mode is set. Item 7. The IC card according to Item 1. 4. The IC card according to claim 3, wherein the modem unit sets a communication protocol in accordance with a signal from the data processing unit. 5. The modem according to claim 1, wherein said modem is a half-duplex communication or a full-duplex communication.
4. The IC card according to claim 3, wherein the setting of the double communication is performed according to a signal from the data processing unit. 6. The IC card according to claim 1, wherein the wireless transmission / reception unit wirelessly receives a power supply voltage for operating the IC card from the external device. 7. The mode setting means sets a contact mode using the contact transmission / reception unit when the operation power supply voltage is not received by the wireless transmission / reception unit, and receives the operation power supply voltage by the radio transmission / reception unit. 7. The IC card according to claim 6, wherein when there is, a wireless mode using the wireless transmitting / receiving unit is set. 8. The apparatus according to claim 1, further comprising a modem unit interposed between said wireless transmitting / receiving unit and said data processing unit for setting data communication and setting a communication protocol when said wireless mode is set. 7. The IC card according to 7. 9. The IC card according to claim 8, wherein the modem unit sets a communication protocol in accordance with a signal from the data processing unit. 10. The IC card according to claim 8, wherein the modem unit sets half-duplex communication or full-duplex communication in accordance with a signal from the data processing unit.