JPH0830754A - Ic card - Google Patents

Abstract

PURPOSE:To obtain an IC card capable of detecting the mounting/dismounting of the card while keeping a living interface without adding any new terminal. CONSTITUTION:In the IC card (card type semiconductor device) which can be easily connected and disconnected to/from a system 1 through a connector, a CD terminal in which a current flows in an inserted state is provided as a means to detect the connection (insertion) and the disconnection (extraction) to/from the system 1, and the change of this current is converted into the change of voltage by mutual induction between coils 7, 9 and an iron core 8, and an amplifier 10 to amplify the said change of the voltage is provided, and a latch circuit 11 to latch an amplified signal as a digital signal is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IC card capable of internally detecting insertion / removal into / from a system (data processing device).

[0002]

2. Description of the Related Art Regarding IC memory cards, the Japan Electronics Industry Association (generally called JEIDA) has standardized the specifications as "IC memory card guidelines Ver. 4.1". Among them, there is provision of means for the system to detect the insertion / removal of the card. According to this regulation, the system can detect the insertion and removal of the card,
The card itself cannot be detected.

If the card itself can detect insertion / removal, the first
In addition, it is possible to easily prevent malfunction due to ringing noise of the power supply at the time of insertion / removal. Second, it is easy to switch between the card built-in battery and the system power supply. Thirdly, it is possible to prevent data destruction due to illegal removal during the read operation.

Regarding a conventional IC card, FIG. 11 and FIG.
13 and FIG. 13. FIG. 11 is a diagram showing a circuit configuration of a conventional IC card and system (data processing device). Further, FIG. 12 is a plan view showing an external configuration of a conventional IC card and system. Further, FIG. 13 is a diagram showing signal waveforms showing the operation of the conventional IC card and system.

In FIG. 11, 1 is a system (data processing device), 2a is an input buffer connected to the CD2 terminal, 2b is an input buffer connected to the CD1 terminal, 3
Reference numerals a and 3b are card detection signals, 4a is a pull-up resistor connected between the VCC (power supply) terminal and the CD2 terminal, and 4b is a pull-up resistor connected between the VCC (power supply) terminal and the CD1 terminal. In addition, 5 is VC as in the system 1.
The IC card includes a C terminal, a CD1 terminal, a CD2 terminal, and a GND terminal.

As shown in FIG. 12, the electrodes of the connector on the system 1 side are prepared in three lengths. VCC, VPP (not shown), and GND terminals are assigned to the long pins. Further, the CD1 and CD2 terminals are assigned to the short pins. Further, other signal lines are assigned to the middle pins. Therefore, the connection order of the terminals when the IC card 5 is inserted and removed is as shown in FIG.

When the IC card 5 is connected (inserted) to the system 1 as shown in FIG. 11, as shown in FIG.
The CD1 and CD2 terminals on the system 1 side change from H to L. That is, the card can be detected by pulling up to VCC on the system 1 side.

[0008]

The conventional IC card as described above has a problem that the card itself cannot detect insertion / removal of the card.

The present invention was made in order to solve the above-mentioned problems, and without adding a new terminal,
The purpose is to obtain an IC card that can detect insertion and removal of the card while maintaining the current interface.

[0010]

The IC card according to claim 1 of the present invention is an IC card which can be easily inserted and removed through a system and a connector and which has a terminal through which an electric current flows in an inserted state, The present invention further includes a card insertion / removal detection circuit that converts the change in the current into a change in the voltage by mutual induction to detect insertion / removal with respect to the system.

An IC card according to claim 2 of the present invention is
In an IC card that can be easily inserted / removed via the system and connector and has a terminal through which a current flows in the inserted state, the change in the current is detected by the current mirror circuit to detect the insertion / removal in / from the system. The card insertion / removal detection circuit is further provided.

The IC card according to claim 3 of the present invention is
In an IC card that can be easily inserted and removed via a system and a connector, and has a terminal through which a current flows in an inserted state, a change in the current is detected by a Hall element to detect the insertion and removal of the system. The card insertion / removal detection circuit is further provided.

The IC card according to claim 4 of the present invention is
In an IC card that can be easily inserted and removed via a system and a connector and has a terminal through which a current flows in an inserted state, a change in magnetic field according to a change in the current is detected by a Hall element, The card insertion / removal detection circuit for detecting insertion / removal is further provided.

An IC card according to claim 5 of the present invention is
According to the card insertion / removal detection signal from the card insertion / removal detection circuit, the power supply monitoring unit for monitoring the power supply voltage is switched between the operating state and the standby state.

An IC card according to claim 6 of the present invention is
A backup power supply changeover switch for switching between a backup power supply and a power supply from the system is controlled based on a card insertion / removal detection signal from the card insertion / removal detection circuit.

An IC card according to claim 7 of the present invention is
According to the card insertion / removal detection signal from the card insertion / removal detection circuit, a timer for controlling the operating time of the security code collating unit for collating the input security code is controlled.

An IC card according to claim 8 of the present invention is
The memory IC and the interface IC that controls access to the memory IC are switched between an operating state and a standby state based on a card insertion / removal detection signal from the card insertion / removal detection circuit.

[0018]

In the IC card according to the first aspect of the present invention, it is possible to easily insert and remove the IC card through the system and the connector, and in the IC card having the terminal through which the current flows in the inserted state, change the current. Since a card insertion / removal detection circuit for converting the change in voltage by mutual induction to detect insertion / removal with respect to the system is further provided, insertion / removal of the IC card can be easily detected and various controls can be performed.

In the IC card according to the second aspect of the present invention, it is possible to easily insert and remove the IC card through the system and the connector, and in the IC card having the terminal through which the current flows in the inserted state, the change of the current is prevented. Since a card insertion / removal detection circuit for detecting insertion / removal of the system by detecting with a current mirror circuit is further provided, I
The insertion / removal of the C card can be easily detected, and various controls can be performed.

In the IC card according to the third aspect of the present invention, it is possible to easily insert and remove the IC card through the system and the connector, and in the IC card having the terminal through which the current flows in the inserted state, the change of the current is changed. Since the card insertion / removal detection circuit for detecting the insertion / removal with respect to the system by detecting with the hall element is further provided, the insertion / removal of the IC card can be easily detected and various controls can be performed.

In the IC card according to the fourth aspect of the present invention, it is possible to easily insert and remove the IC card through the system and the connector, and the IC card provided with a terminal through which a current flows in the inserted state is not affected by the change in the current. The IC is further equipped with a card insertion / removal detection circuit for detecting the change in the magnetic field according to the Hall element to detect the insertion / removal of the system.
Card insertion / removal can be easily detected, and various controls are possible.

In the IC card according to the fifth aspect of the present invention, the power supply monitoring unit for monitoring the power supply voltage is switched between the operating state and the standby state based on the card insertion / removal detection signal from the card insertion / removal detection circuit. Therefore, it is possible to prevent the malfunction caused by the ringing noise of the power supply generated when the card is inserted.

In the IC card according to the sixth aspect of the present invention, the backup power supply changeover switch for switching between the backup power supply and the power supply from the system is controlled based on the card insertion / removal detection signal from the card insertion / removal detection circuit. As a result, the power supply monitoring unit, which was required in the past, is no longer necessary.

In the IC card according to the seventh aspect of the present invention, a timer for limiting the operating time of the security code collating unit for collating the inputted security code based on the card insertion / removal detection signal from the card insertion / removal detection circuit. Since it is controlled, the security can be improved.

In the IC card according to the eighth aspect of the present invention, the memory IC and the interface IC for controlling its access are set to the operating state / standby state based on the card insertion / removal detection signal from the card insertion / removal detection circuit. Since the switching is performed, it is possible to prevent problems such as garbled data against unauthorized removal of the card during the card reading operation.

[0026]

Embodiments of the present invention will be described below. The first to fifth embodiments and the tenth embodiment relate to the card insertion / removal detection means, and the sixth to ninth embodiments relate to the control of the card using the card insertion / removal detection signal.

Example 1. Embodiment 1 of the present invention will be described with reference to FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention. The configuration on the system 1 side is the same as the conventional one, and the same applies to each of the following embodiments. Further, in each drawing, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 5A is an IC card according to the first embodiment, 6 is a noise suppressing capacitor connected between CD and GND, 7 is a coil connected between CD and GND, 8 is an iron core, Reference numeral 9 is a coil wound around the other side of the iron core 8, 10 is an amplifier connected to the coil 9, and 11 is a latch circuit connected to the amplifier 10. It should be noted that S is a card insertion / removal detection signal, and CD represents CD1 or CD2, which is the same in each of the following embodiments.

The coil 7 is arranged between the CD and GND on the IC card 5A side, and the coil 9 is installed via the iron core 8. I
CD-GND when C card 5A is inserted into system 1
An electric current begins to flow in the meantime. Since the current value increases until the current value reaches the steady value, the magnetic flux density in the iron core 8 also increases. Therefore, an electromotive force is generated in the coil 9. Next, the generated voltage is amplified by the amplifier 10. Since the electromotive force disappears in the steady state, the rising edge is latched using the latch circuit 11.

When the IC card 5A is removed, the reverse is done, so that the current value is decreased and the electromotive force in the opposite direction is generated. Therefore, the fall in the opposite direction is similarly latched. As described above, I
The insertion / removal of the C card 5A can be detected. The card insertion / removal detection signal S is H level in the card insertion state and L level in the card removal state.

That is, in the first embodiment, in an IC card (card type semiconductor device) which can be easily connected / disconnected via the system 1 and the connector, connection (insertion) and disconnection (removal) with the system 1 are performed. As a means to detect
It has a CD terminal through which a current flows in an inserted state, has an amplifier (amplifier) 10 that converts a change in the current into a change in the voltage by mutual induction, and amplifies the change in the voltage. The amplified signal is converted into a digital signal. It has a circuit 11 for latching.

Example 2. A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing the configuration of the second embodiment of the present invention.

In FIG. 2, 5B is an IC card according to the second embodiment, and 12 is an NPN connected between CD and GND.
Transistors (Q1) and 13 are NPN transistors (Q
2) and 14 are resistors (R2), and 15 is a buffer.

On the side of the IC card 5B, an NPN transistor 12 whose base and collector are short-circuited is connected between CD and GND. When the IC card 5B is inserted into the system 1,
A current flows between CD and GND. When a current flows through the transistor 12, the transistor 13 is also turned on and a current flows. Then, due to the voltage drop of the resistor 14, the input of the buffer 15 becomes H → L. Therefore, the card insertion / removal detection signal S becomes L → H. As described above, the insertion / removal of the IC card 5A can be detected. The card insertion / removal detection signal S is H level in the card insertion state and L level in the card removal state.

That is, the second embodiment has a CD terminal through which a current flows in the inserted state as a means for detecting the insertion / removal with the system 1, and the transistor 1 is provided between the terminals.
It has a current mirror circuit composed of 2 and 13 and has another transistor 13 which is turned on when the transistor 12 is turned on. Therefore, the structure is simple and can be realized at low cost.

Example 3. A third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing the configuration of the third embodiment of the present invention.

The third embodiment is the same as the N in the second embodiment.
The NMOS transistors 16 and 17 are used instead of the PN transistors 12 and 13, and the effects are the same as those of the second embodiment.

That is, the third embodiment has a CD terminal through which a current flows in the inserted state as a means for detecting insertion / removal of the system 1 and the transistor 1 is provided between the terminals.
It has a current mirror circuit composed of 6 and 17 and has another transistor 17 which is turned on when the transistor 16 is turned on.

Embodiment 4 FIG. A fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing the configuration of the fourth embodiment of the present invention.

In FIG. 4, 5D is an IC card according to the fourth embodiment, 18 is a magnet for generating a magnetic field, and 19 is a CD.
A hall element connected between −GND, 20 is an amplifier connected to the hall element 19, 21 is an analog / digital interface buffer, and 22 is a driver.

The Hall element 19 is installed between the CD and GND on the IC card 5D side. A magnet 18 is installed near the hall element 19 so that a magnetic field is applied to the hall element 19. The magnet 18 may be a permanent magnet or an electromagnet.
Further, the N-pole and the S-pole may be paired so as to apply a more sufficient magnetic field to the Hall element 19, and the Hall element 19 may be sandwiched therebetween.

When the IC card 5D is inserted into the system 1, a current flows between CD and GND. When a current flows between the a and b terminals in the magnetic field, the hall element 19 receives the terminals x and y.
Generates an electromotive force. The voltage between the terminals x and y is applied to the amplifier 2
The signal is amplified by 0, the output is converted into a logic level by the analog / digital interface buffer 21, and the card insertion / removal detection signal S is output via the driver 22. The card insertion / removal detection signal S is H level in the card insertion state and L level in the card removal state.

That is, in the fourth embodiment, as means for detecting insertion / removal of the system 1, a CD terminal through which a current flows in an inserted state, a hall element 19 between the terminals, and a magnetic field is applied to the hall element 19. Has a magnet 18 for
It has an amplifier 20 for amplifying the output voltage of the hall element 19 and an interface buffer 21 for converting the amplified voltage into a logic level.

Example 5. A fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram showing the configuration of the fifth embodiment of the present invention.

In FIG. 5, 5E is an IC card according to the fifth embodiment, 23 is a coil connected between CD and GND, 24 is an iron core, 27 is VCC through resistors 25 and 26.
A hall element connected between −GND, 28 is an amplifier connected to the hall element 27, 29 is an analog / digital interface buffer, and 30 is a driver.

The coil 23 is formed between the CD and GND on the IC card 5E side, and the iron core 24 is passed therethrough. The end of the iron core 24 is shaped so as to sandwich the hall element 27 so that the magnetic field generated in the coil 23 is concentrated on the hall element 27 via the iron core 24.

When the IC card 5E is inserted into the system 1, a current flows between CD and GND, that is, the coil 23. A magnetic field is generated in the coil 23 by the steady current, and the iron core 2
A magnetic field is applied to the Hall element 27 via 4. Since current flows between the terminals a and b in the Hall element 27 in a magnetic field, electromotive force is generated between the terminals x and y. The voltage between the terminals x and y is amplified by the amplifier 28, the output is converted into a logic level by the analog / digital interface buffer 29, and the card insertion / removal detection signal S is output via the driver 30. The card insertion / removal detection signal S is H when the card is inserted.
Level, L level in the removed state.

In other words, the fifth embodiment has a CD terminal through which a current flows in the inserted state and a coil 23 between the terminals as means for detecting insertion / removal of the system 1, and a constant current flows. Hall element 27 present and the coil 2
3 has an iron core 24 for applying the magnetic field generated in 3 to the Hall element 27, an amplifier 28 for amplifying the output voltage of the Hall element 27, and an interface buffer 29 for converting the amplified voltage into a logic level. It is a thing.

Example 6. A sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing the configuration of the sixth embodiment of the present invention.

In FIG. 6, 5F is an IC card according to the sixth embodiment, 31 is a card insertion / removal detection circuit according to any of the first to fifth embodiments, 32 and 33 are resistors connected between VCC and GND, and 34 is a resistor. Is a reference voltage (VRF), 35 is a power supply monitoring unit, and 36 is an inverter.

In the sixth embodiment, the power supply monitoring section 35 is controlled by using the card insertion / removal detection signal S from the card insertion / removal detection circuit 31 of any of the first to fifth embodiments.

The power supply monitoring unit 35 detects a decrease in the power supply voltage by comparing the power supply from the system 1 and the reference voltage 34, and outputs a reset signal when the voltage becomes lower than the level, and the memory due to the abnormality of the power supply voltage. Prevents garbled data and malfunctions.

Since the power supply monitor 35 uses a voltage comparator having a high detection sensitivity, it is apt to be adversely affected by noise such as malfunction. Therefore, the power supply monitoring unit 35 keeps the standby state until the card insertion / removal detection signal S becomes H, that is, until the card is inserted. As a result, it is possible to prevent a malfunction caused by ringing noise of the power supply generated when the card is inserted. The same effect can be obtained by reversing this operation when the card is removed.

That is, the sixth embodiment is an IC card (card type semiconductor device) which can be easily connected / disconnected from the system 1 via a connector, and includes a power supply monitoring unit 35 for monitoring the power supply voltage, and The card insertion / removal detection circuit 31 according to any one of the first to fifth embodiments, and the card insertion / removal detection signal S.
It is possible to switch the power supply monitoring unit 35 between the operating state and the standby state.

Embodiment 7 FIG. A seventh embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram showing the configuration of the seventh embodiment of the present invention.

In FIG. 7, 5G is the IC card according to the seventh embodiment, 31 is the card insertion / removal detection circuit of any of the first to fifth embodiments, 37 is a driver connected to the card insertion / removal detection circuit 31, and 38 is a driver. 39, 40 are backup power source changeover switches made of PMOS transistors, 4
1 is a backup power source such as a button battery, 42 is a memory I
It is C.

The seventh embodiment uses the card insertion / removal detection signal S from the card insertion / removal detection circuit 31 of any of the first to fifth embodiments to backup power source changeover switches 39, 40.
Is to control.

When the IC card 5G is inserted into the system 1, the card insertion / removal detection signal S is at H level, and the backup power source changeover switch 39 is supplied via the driver 37.
ON, and backup power source switch 40 OFF
To do.

On the other hand, when the IC card 5G is removed from the system 1, the card insertion / removal detection signal S is at L level, the backup power supply switch 39 is turned off via the driver 37, and the backup power supply switch 4
Turn 0 on. Therefore, there is an advantage that the power supply monitoring unit which has been conventionally required is not required.

That is, the seventh embodiment is an IC card (card type semiconductor device) which can be easily connected / disconnected from the system 1 through the connector, and has the battery 41 built therein, and the battery 41 and the system 1 are separated from each other. Backup power source changeover switches 39 and 40 for switching the power source of the first embodiment, and the first embodiment.
5 to 5 and a backup power source changeover switch 39 having a card insertion / removal detection signal S.
It is possible to control 40.

Example 8. Embodiment 8 of the present invention will be described with reference to FIG. FIG. 8 is a diagram showing the configuration of the eighth embodiment of the present invention.

In FIG. 8, 5H is the IC card according to the eighth embodiment, 31 is the card insertion detection circuit of any of the first to fifth embodiments, 43 is a timer connected to the card insertion detection circuit 31, and 44 is a timer. 43 is a security code collating unit, 45 is an interface IC, and 46 is a bus connected to a middle pin (signal line).

The eighth embodiment receives a card insertion / removal detection signal S from the card insertion / removal detection circuit 31 of any of the first to fifth embodiments, and a timer 43 of a security code collating section 44.
Is to control.

The timer 25 activates the security code collating unit 24 only for a certain period of time. When the IC card 5H is inserted into the system 1, the timer 43 is activated by the card insertion / extraction detection signal S to enter the security code input mode.

In this mode, when the security code is input from the system 1 through the bus (address bus, data bus, control bus) 46, the collating unit 44 compares the codes, and if they match, the / CS signal is sent to the interface IC.
By sending the data to the IC card 45, the IC card 5H can be normally accessed for the first time. The security code input mode is valid only for a certain period of time by the function of the timer 43, and if this time is not passed, this IC
Card 5H does not work.

In other words, the eighth embodiment is an IC card (card type semiconductor device) which can be easily connected / disconnected from the system 1 via the connector, in which the security code collating section 44 and the collating section 44 are provided. The timer 43 for limiting the operating time and the card insertion / removal detection circuit 31 of the first to fifth embodiments are provided, and the operation of the collating unit 44 and the timer 43 is started by the card insertion / removal detection signal S. .

Example 9. The ninth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a diagram showing the configuration of the ninth embodiment of the present invention.

In FIG. 9, 5J is an IC card according to the ninth embodiment, 31 is a card insertion / removal detection circuit, 47 is an inverter, 42 is a memory IC, and 45 is an interface I.
C and 46 are buses connected to middle pins (signal lines).

The ninth embodiment uses the card insertion / removal detection signal S from the card insertion / removal detection circuit 31 of any of the first to fifth embodiments to interface IC45 and memory IC.
The state control of 42 is performed.

When the IC card 5J is not connected to the system 1, the interface IC 45 and the memory IC 42 are put in the standby state. This allows the IC
It is possible to prevent a malfunction such as garbled data when the card 5J is illegally removed during the reading operation.

That is, the ninth embodiment is an IC card (card type semiconductor device) which can be easily connected / disconnected to / from the system 1 through the connector.
And interface IC which is an access control means thereof
45 and the card insertion / removal detection circuit 31 of the first to fifth embodiments, and the memory IC having the card insertion / removal detection signal S
42 and the interface IC 45 are switched to the operating state / standby state.

Example 10. The tenth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a diagram showing the configuration of a card insertion / removal detection circuit according to the tenth embodiment of the present invention.

In FIG. 10, 31 is a card insertion / removal detection circuit according to any of the first to fifth embodiments, 48 is a NAND circuit connected to the two card insertion / removal detection circuits 31, and 49 is an inverter.

The card insertion / removal detection circuit 31A has two CD terminals (CD1 and CD2) for each of the first embodiment.
The card insertion / removal detection circuit 31 is provided, and the AND signal of its output S is used as the card insertion / removal detection signal SA. It may be used instead of the card insertion / removal detection circuit 31 used in Examples 6 to 9 above. This makes it more reliable.

[0075]

As described above, the IC card according to claim 1 of the present invention can be easily inserted and removed via the system and the connector, and is an IC card having a terminal through which a current flows in the inserted state. Since the IC card is further equipped with a card insertion / extraction detection circuit that converts the change in the current into a change in the voltage by mutual induction to detect the insertion / removal with the system, it is possible to easily detect the insertion / removal of the IC card and eventually various controls. Has the effect that it is possible.

The IC card according to claim 2 of the present invention is
As described above, in an IC card that can be easily inserted / removed via the system and the connector and has a terminal through which a current flows in the inserted state, a change in the current is detected by the current mirror circuit and Since the card insertion / removal detection circuit for detecting insertion / removal is further provided, it is possible to easily detect the insertion / removal of the IC card with a simple configuration, and thus it is possible to perform various controls.

The IC card according to claim 3 of the present invention is
As described above, in the IC card that can be easily inserted and removed via the system and the connector and has the terminal through which the current flows in the inserted state, the change in the current is detected by the hall element and the insertion into the system is performed. Since the card insertion / removal detection circuit for detecting the removal is further provided, it is possible to easily detect the insertion / removal of the IC card, and thus it is possible to perform various controls.

The IC card according to claim 4 of the present invention is
As described above, in the IC card that can be easily inserted and removed via the system and the connector and has a terminal through which a current flows in the inserted state, the Hall element detects a change in the magnetic field according to the change in the current. Since the card insertion / removal detection circuit for detecting the insertion / removal of the IC card into / from the system is further provided, there is an effect that the insertion / removal of the IC card can be easily detected and eventually various controls can be performed.

An IC card according to claim 5 of the present invention is
As described above, the power supply monitoring unit that monitors the power supply voltage is switched between the operating state and the standby state based on the card insertion / removal detection signal from the card insertion / removal detection circuit. With this, it is possible to prevent an erroneous operation caused by.

An IC card according to claim 6 of the present invention is
As described above, the backup power supply changeover switch for switching between the backup power supply and the power supply from the system is controlled based on the card insertion / removal detection signal from the card insertion / removal detection circuit. The effect that is unnecessary.

The IC card according to claim 7 of the present invention is
As described above, the timer for limiting the operating time of the security code collating unit that collates the input security code is controlled based on the card insertion / removal detection signal from the card insertion / removal detection circuit, which improves the security. There is an effect that can be achieved.

An IC card according to claim 8 of the present invention is
As described above, the memory IC and the interface IC that controls access to the memory IC are switched between the operating state and the standby state based on the card insertion / removal detection signal from the card insertion / removal detection circuit. This has the effect of preventing problems such as data corruption against unauthorized removal of the card.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a seventh embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of an eighth embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a ninth embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a card insertion / removal detection circuit according to a tenth embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a conventional system and an IC card.

FIG. 12 is a plan view showing appearances of a conventional system and an IC card.

FIG. 13 is a signal waveform diagram showing operations of a conventional system and an IC card.

[Explanation of symbols]

1 system (data processing device), 5A, 5B, 5C,
5D, 5E, 5F, 5G, 5H, 5J IC card, 7
Coil, 8 iron core, 9 coil, 12 transistor, 13 transistor, 16 transistor, 17
Transistor, 18 magnet, 19 Hall element, 23
Coil, 24 iron core, 27 Hall element, 31, 31A
Card insertion / removal detection circuit, 35 Power supply monitoring unit, 39, 40
Backup power switch, 42 memory IC,
43 timer.

Claims (8)

[Claims] 1. An IC card, which can be easily inserted and removed via a system and a connector and has a terminal through which a current flows in an inserted state, converts the change in the current into a change in the voltage by mutual induction, and An IC card further comprising a card insertion / removal detection circuit for detecting insertion / removal of the system. 2. An IC card which can be easily inserted and removed via a system and a connector and which has a terminal through which a current flows in an inserted state, detects a change in the current by a current mirror circuit, and is connected to the system. An IC card further comprising a card insertion / removal detection circuit for detecting insertion / removal. 3. An IC card which can be easily inserted / removed via a system and a connector and which has a terminal through which a current flows in an inserted state, detects a change in the current by a hall element, and inserts it into the system. , Further comprising a card insertion / removal detection circuit for detecting removal
card. 4. An IC card, which can be easily inserted / removed via a system and a connector and has a terminal through which a current flows in an inserted state, detects a change in a magnetic field according to a change in the current by a hall element. The IC card further comprises a card insertion / removal detection circuit for detecting insertion / removal of the card into / from the system. 5. A power supply monitoring unit for monitoring a power supply voltage is switched between an operating state and a standby state on the basis of a card insertion / removal detection signal from the card insertion / removal detection circuit. The IC card according to any one. 6. The backup power supply changeover switch for switching between a backup power supply and a power supply from the system is controlled based on a card insertion / removal detection signal from the card insertion / removal detection circuit. The IC card according to any one of 1. 7. A timer for limiting an operating time of a security code collating unit for collating an inputted security code is controlled on the basis of a card insertion / removal detection signal from said card insertion / removal detection circuit. The IC card according to claim 4. 8. The memory IC and an interface IC for controlling access to the memory IC are switched between an operating state and a standby state based on a card insertion / removal detection signal from the card insertion / removal detection circuit. The IC card according to any of items 4 to 4.