JP2000113148A - Combination card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combination card compatible for contact and non-contact types. SOLUTION: A combination card 200 is provided with an RF interface 210, control circuit 220, memory 230, contact terminal 240, signal switch 250 and power source switch 260. The signal switch 250 and power source switch 260 are provided between the contact terminal 240 and control circuit 220. In the case of non-contact mode not only the signal switch 250 but also the power source switch 260 are turned off. Thus, since all the contact terminals can be electrically insulated from the internal circuit of the combination card 200 in the case of operation in the non-contact mode, fine power P1 can be prevented from being leaked from the contact terminal 240 by electromagnetic induction. Further, even when a voltage higher than the inside of an IC chip is impressed to the power source terminal, an internal voltage is continuously operated by RF power from a regulator output and the combination card capable of dealing with electric attack can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to combination cards, and more particularly, to the isolation of power terminals when the combination card is in a non-contact mode.

[0002]

2. Description of the Related Art There is a hybrid card or a combination card in which a contact type IC card and a non-contact type IC card are contained in one card. The combination card is a combination of a contact type IC card and a non-contact type IC card.
It can be used in both devices. 2. Description of the Related Art In applications in which a contact type IC card has been widely used, a combination card having both functions is useful when using a non-contact type IC card. Also,
A combination card is useful in that a contact type IC card and a non-contact type IC card can be selectively used with one card according to an application.

FIG. 1 is a schematic block diagram of a combination card 100 according to the prior art. The combination card 100 includes an RF interface 110, a control circuit 120, a memory 130, a contact terminal 140, and a signal switch 150. An activation signal is constantly output from the RF reader / writer 105. When the combination card 100 enters the electromagnetic field and the activation signal transmitted by the RF reader / writer 105 reaches the combination card 100, the energy of the signal causes an RF interface. At 110, a starting power P1 is generated. The combination card 100 is operated using the power P1. This electromotive force uses the principle of electromagnetic induction. According to this method, the combination card 10
No. 0 enables the combination card 100 and the RF reader / writer 105 to operate in a non-contact manner semipermanently without incorporating a battery required for driving. Also,
The RF interface 110 converts the RF signal to a data signal,
The signal is converted into an electric signal S1 such as a clock signal and a reset signal.

When the combination card functions as a contact-type IC card, the contact terminal 240 is inserted into a contact-type reader / writer (not shown) so that the contact terminal 240 is inserted.
40 together with a signal S2 such as a data signal, a clock signal and a reset signal.
00 is supplied with the electric power P2 necessary for driving the 00.

[0005] The combination card switches between a contact mode and a non-contact mode to function as one of the cards. Conventionally, when functioning in the non-contact mode, generally, a signal switch 150 is provided on the contact terminal 140 to inhibit input / output of the signal S2 from the contact terminal 140, and the signal S2 is electrically cut off. However, even in the case of the non-contact mode, the power supply terminal remains connected without being interrupted. This is because there is no need to insulate the power supply terminal when using a non-contact IC card alone, and the power supply terminal is irrelevant to signal input / output. This is because it is considered to be sufficient for prevention, and if the power supply line is cut off, a stable predetermined voltage may not be obtained when the contact mode is started.

[0006]

The power P1 that can be obtained by electromagnetic induction when operating the combination card in the non-contact mode is very small.

Conventionally, even in the non-contact mode, since the power supply terminal is in a conductive state, there is a problem that the power P1 leaks from the contact terminal.

In addition, there is a problem that the above-mentioned leakage is easily generated when the user short-circuits the contact terminal with a finger during the operation in the non-contact mode.

Further, when a voltage higher than that in the IC chip is applied to the power supply terminal during the non-contact mode operation,
There was a danger that the chip was exposed to an electric attack.

[0010] Therefore, an object of the present invention is to provide a combination card that can prevent leakage of power P1 from a contact terminal even in a non-contact mode.

[0011] Another object of the present invention is to provide an electric power P1 even when a user short-circuits a contact terminal with a finger during operation in a non-contact mode.
To provide a combination card that can prevent the leakage of the card.

It is still another object of the present invention to provide a combination card capable of coping with an electric attack even when a higher voltage is applied to a power supply terminal than in an IC chip during operation in a non-contact mode. .

[0013]

SUMMARY OF THE INVENTION The above and other objects are attained by connecting to an antenna, exchanging RF signals with the outside, and generating a signal S1 and power P1 required for driving the combination card from the RF signals. An interface, a contact terminal provided on the combination card and having a signal terminal receiving the signal S2 and a power terminal receiving the power P2, and coupled to the RF interface; the signal S1 from the RF interface; the signal P1 from the RF interface; or the signal S2 from the contact terminal. A control circuit that receives at least one of the powers P2 and outputs a mode control signal that controls switching between the non-contact mode and the contact mode; and a power switch coupled to the power terminal of the contact terminal and the control circuit, According to the mode control signal, the power from the power supply terminal in the case of the contact mode 2 was supplied to the control circuit is realized by a combination card configured from a power switching means for interrupting the power supply terminal and the control circuit for non-contact mode.

[0014]

FIG. 2 is a simplified block diagram of a combination card 200 according to one embodiment of the present invention. The combination card 200 includes an RF interface 210,
It comprises a control circuit 220, a memory 230, a contact terminal 240, a signal switch 250, and a power switch 260.

The RF interface 210 is connected to the antenna and the control circuit 220. The RF interface 210 exchanges an RF signal with the RF reader / writer 205 using an antenna, and converts the RF signal into an electric signal S1 such as a data signal and a clock signal. In addition, the power P1 necessary for driving the combination card 200 is generated by the electromotive force of the electromagnetic induction. The operation of the RF interface 210 is the same as that of the related art, and thus a detailed description is omitted.

The control circuit 220 supplies a mode control signal for controlling the switching between the non-contact mode and the contact mode to the signal switch 250 and the power switch 260.
For example, when operating the combination card 200 in the non-contact mode, a mode control signal for turning off the signal switch 250 and the power switch 260 is output. When operating the combination card 200 in the contact mode, a mode control signal for turning on the signal switch 250 and the power switch 260 is output. When the power P2 and the signal S2 are given from the contact terminal 240 during the operation in the non-contact mode, or when the power P1 and
When the signal S2 and the signal S2 are given, which one is given priority depends on the control of the mode control signal by the control circuit 220. The memory 230 is connected to the control circuit 220,
The data signals of the signals S1 and S2 are stored.

The contact terminal 240 includes a power terminal for receiving the power P2 and a signal terminal for inputting and outputting a signal S2 such as a data signal, a clock signal, and a reset signal. The contact terminal 240 is provided so as to be exposed on the surface of the combination card 200, and comes into contact with an external contact-type reader / writer (not shown) when used as a contact-type card. The power terminal of the contact terminal 240 is connected to the control circuit 220 via the power switch 260, and the signal terminal of the contact terminal 240 is connected to the control circuit 220 via the signal switch 250.

The signal switches 250 are provided between the signal terminals of the contact terminals 240 and the control circuit 220, respectively. The signal switch 250 is operated according to the mode control signal of the control circuit 220. For example, in the non-contact mode, the signal switch 250 is turned off to electrically cut off the signal terminal and the control circuit. In the contact mode, the signal switch 250 is turned on to couple the signal terminal and the control circuit to supply the signal S2 to the control circuit.

The power switch 260 is N in the preferred embodiment.
It is composed of a type transistor and is provided between the power supply terminal of the contact terminal 240 and the control circuit 220. The power switch 260
It operates according to the mode control signal of the control circuit 220.
For example, in the contact mode, the power switch 260 is turned on. As a result, the control circuit 220 sets the contact terminal 24
Power P2 can be received from 0. When operating in the non-contact mode, the power switch 260 is turned off, and the power terminal 240 and the control circuit 220 are electrically disconnected.

Therefore, the combination card 20
When operating 0 in the non-contact mode, not only the signal terminal but also the power supply terminal are electrically insulated from the internal circuit of the combination card 200. Since all contact terminals are electrically insulated, power P1 is applied to the contact terminals (power terminals).
Can be prevented from leaking.

FIG. 3 is a simplified circuit diagram of a power supply system of a combination card 300 according to another embodiment of the present invention. The circuit diagram of the signal system is omitted for convenience of explanation.

The combination card 300 is an embodiment in which a booster circuit 261 is further provided between the power switch 260 and the control circuit 220 of the combination card 200. When only the power switch 260 is provided in the power terminal, when switching from the non-contact mode to the contact mode, the voltage obtained from the power terminal may drop by about 1 volt from the desired voltage. Operation may not be stable. Therefore, in another preferred embodiment of the present application, the power switch 260 and the control circuit 2
The booster circuit 261 is provided between the booster circuit 20 and the booster circuit 20.

The operation of the booster circuit 261 will be described.

When the mode control signal is the non-contact mode, C
Regardless of the presence or absence of the LOCK signal, the power switch 260 is turned off, and when a potential is applied between the power terminals 1 and 2, electric charges are accumulated in C1, C2, and C3.

Even if the mode control signal is switched to the contact mode, the signal terminal of the combination card is not in contact with an external contact reader / writer (not shown), or the CLOCK signal is supplied even if it is in contact. If not, the power switch 260 is turned off and the combination card does not operate in the contact mode. When a potential is applied between the power supply terminals 1 and 2 from an external contact type reader / writer, electric charges are accumulated in C1, C2 and C3.

When the mode control signal is switched to the contact mode and the CLOCK signal is supplied, the power switch 260 is turned on, and the voltage boosted by the charges stored in C1, C2, and C3 is applied to the control circuit 220. Given to.

Thus, even when the mode is switched from the non-contact mode to the contact mode, a desired voltage is secured by the booster circuit 261, the operation of the combination card 300 is stabilized, and malfunction can be prevented.

[0028]

The present invention has the following effects.

According to the present invention, in the non-contact mode, all the contact terminals are electrically insulated from the internal circuit of the combination card, thereby preventing the leakage of power from the contact terminals. Can be used effectively, so that it is possible to provide a combination card that ensures an accurate operation and extends the flight distance.

Further, the present invention provides a combination in which normal operation is guaranteed without leakage of power even when the user short-circuits the contact terminals with a finger or the like by disconnecting all the contact terminals in the non-contact mode. Cards can be provided.

Further, according to the present invention, in the non-contact mode, by disconnecting all the contact terminals, the
Even if a voltage higher than that in the chip is applied, the internal voltage continues to operate with the RF power from the output of the regulator, can deal with an electric attack, and can provide a combination card that prevents malfunction.

Further, the present invention can provide a combination card in which a desired power supply voltage can be obtained even when switching from the non-contact mode to the contact mode, thereby preventing malfunction due to insufficient voltage.

Although the circuit of the present invention has been described herein with reference to a specific embodiment, those skilled in the art will be able to modify and modify the circuit of the present invention. However, the circuits of the present invention are not limited to the specific embodiments disclosed herein. For example, in the embodiment, an N-type transistor is used for the power switch. However, another transistor, a diode, or a micromachining switch can be used, and the present invention is not limited to the N-type transistor. The present invention does not limit the circuit of the booster circuit. Further, any control method of the mode control signal for switching the power switch may be used. Furthermore, although the example using the electromagnetic induction method has been described, other non-contact methods such as a radio communication method, an optical communication method, or an electrostatic coupling method can be used. further,
The type of memory is not particularly limited, and RAM, ferroelectric memory, EEPROM and the like can be used. Such modifications and changes are also included in the scope of the technical concept of the present invention, and are included in the scope of the claims.

[Brief description of the drawings]

FIG. 1 shows a conventional combination card 100.
It is a schematic block diagram of.

FIG. 2 is a simplified block diagram of a combination card 200 according to one embodiment of the present application.

FIG. 3 is a simplified circuit diagram of a power supply system of a combination card 300 according to another embodiment of the present application.

[Explanation of symbols]

 105, 205 RF reader / writer 110, 210 RF interface 120, 220 Control circuit 130, 130 Memory 140, 240 Contact terminal 150, 250 Signal switch 260 Power switch 261 Boost circuit

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Etsuko Nakamoto 3-20-1, Minamiazabu, Minato-ku, Tokyo F-term in Nippon Motorola Co., Ltd. 5B035 AA00 BB09 CA08 CA25 5B058 CA12 CA14 CA17 CA22 KA21

Claims (2)

[Claims] 1. A combination card (200) having functions of a contactless mode and a contact mode, wherein the combination card (200) is connected to an antenna and exchanges an RF signal with an external device.
An RF interface (2) for generating a signal S1 and a power P1 required for driving the combination card from the signal.
10); a contact terminal (240) provided on the combination card and having a signal terminal receiving the signal S2 and a power terminal receiving the power P2; being coupled to the RF interface and receiving a signal S1, power P1 or the contact from the RF interface; A control circuit (220) for receiving at least one of the signal S2 and the power P2 from the terminal (240) and outputting a mode control signal for controlling switching between the non-contact mode and the contact mode; Power switch coupled to the control circuit (260)
And a power switch for supplying power P2 from the power terminal to the control circuit in a contact mode in accordance with the mode control signal, and shutting off the power terminal and the control circuit in a non-contact mode. Means; a combination card comprising: 2. A booster circuit (261) coupled to said power switch means (260) and a control circuit (220), wherein said power P from said power supply terminal in contact mode.
2. The combination card according to claim 1, further comprising a booster circuit (261) for boosting the voltage of the second card to a predetermined voltage.