JPS63203396A - IC card with built-in power supply - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an IC card with a built-in power supply that can be used as a standalone card.

[Prior art and its problems] Recently, it has been called the cashless era, and by using cards issued by credit card companies, it has become possible to purchase products without handling cash. .

Incidentally, conventionally used cards include plastic cards, embossed cards, magnetic striped cards, etc., but these cards are easy to forge due to their structure, so unauthorized use has become a problem.

To solve this problem, an information card, a so-called IC card, in which a personal identification number and the like are stored inside the card has been considered, and an IC card system that combines such an IC card and a terminal has been developed.

Conventionally, the IC cards used in such systems are:
The card did not have its own power supply and could not be used alone. For this reason, all data input from the IC card is processed through the terminal, which has the disadvantage that the range of use of the card is limited.

Therefore, recently, so-called intelligent type IC cards have been developed to expand the range of use by providing the IC card with its own power supply and making it possible to process data on its own.
A C card is being considered.

By the way, an IC card with an internal R power supply like this,
When the card is used alone, the built-in power supply is used; when the card is attached to an external terminal, the power supply from the external terminal is used.

However, with this type of IC card, especially when using the built-in power supply by using the card alone, the llll11111 is used only when connecting the built-in power supply to an external terminal.
Since power is also supplied to circuits that are not necessary for the card's unit operation, such as circuits, arithmetic circuits, and memory circuits, the power consumed by these unnecessary circuits increases the power consumption of the entire card. There was a tendency to

As a result, if the built-in power source is a primary or secondary battery,
There are economic disadvantages such as shortened battery life, and
Inside? l! ! When the source is a solar cell, the cell area must be made as large as possible, which has the disadvantage of making it difficult to apply it to IC cards with size restrictions.

[Purpose of the invention] This invention was made in view of the above circumstances, and it is possible to shut off the supply of built-in power to the circuit block that is used only when connected to a terminal, thereby reducing unnecessary power consumption when using the card alone. The purpose is to provide an IC card with a built-in power supply that can be completely eliminated.

[Key Points of the Invention] According to this invention, the internal circuit of the card is connected to a first circuit block that is powered by an external power supply only when connected to a terminal or a terminal, and a first circuit block that is powered by an external power supply or a single card when connected to a terminal. In the second case, the inner R power is supplied and driven.
When the card is used as a standalone circuit block, the first circuit block is used only when connected to a terminal, and the first circuit block is configured to prevent the Na source from supplying power.

[Embodiments of the Invention] Hereinafter, one embodiment of this invention will be described with reference to the drawings.

FIG. 1 shows the circuit configuration of the same embodiment.

In the figure, 11 is a system bus, and this system bus 11 includes an answer-to-reset data ROM 12, an application ROM 13, and a test program ROM 1.
4. System program ROM15, working RAM
16, a central controller 17, a read/write controller 18, a display controller/driver 19, a key controller 20, an input controller 22 via an input buffer 21, and an output controller 24 via an output buffer 23 are connected, respectively.

In addition, the input controller 22 and the output controller 2
4 is connected to a data input/output terminal I10.

Here, the answer-to-reset data ROM 12 is
It stores all operating conditions for the C card itself (for example, data writing, applied voltage, current permissible value and maximum applied voltage, maximum data transmission amount, maximum response time, etc.), and these condition data are stored in the card's own internal initials. When the process is completed, it is transmitted to a terminal (not shown) as answer-to-reset data in a predetermined format9.

The application ROM 13 stores card type data rAPNJ based on what kind of IC card this IC card is.
After the initial parameter ΔQ based on the two-reset data is determined, it is formatted and transmitted when exchanging attributes with the terminal.

The test program ROM 14 stores a program for card testing.

The system program ROM 15 contains various system programs as well as a code signal [AcKJ or rNACJ] indicating whether the signals transmitted and supplied from the terminal are correct or not.
It is equipped with

The working RAM 16 is used to store processing data for each battle within the card.

The central controller 17 outputs operation commands to each circuit according to the data reception signal transmitted and supplied via the input buffer 21 and the operation state.

The read/write controller 18 controls detailed reading of data from the storage memory 25 in response to commands from the central controller 17.

In this case, the storage memory 25 is a public zone for storing public data, for example, a dark 1 [number I'P
IN-”, data re-input count rRTNJ (Re-
Try Number), verification number ``Number until PINJ is used rlPINJ ([n1tial
1zationPersonal Identification
cati.

n Number>, account number rPANJ (prim
ary Account Number), decryption code rPRKJ (Pri
It has a secret zone in which information such as Vate Key Code is stored, a transaction zone in which various data related to general transactions are stored, and a credit zone in which data related to credit transactions is stored.

The display controller 19 controls the display 1b.

The key controller 20 provides a key sampling signal to the key manual input unit 1a to detect the key manual input signal.

A timer 26 is connected to the central controller 0-517. This timer 26 is the rONJ of the key human power section 1a.
When the power is turned on by key operation, it is operated on the condition that there is no external power supply, and interrupts the central controller 17 at predetermined intervals, for example, in units of one second.

The contents of the storage memory 25 read by the read/write controller 18 are applied to one input terminal of the comparator 27 . The comparator 27 has the input buffer 21 at the other input terminal.
, data stored in the working RAM 16, etc. are given. The comparison output of this comparator 27 is then sent to the central controller 17.

On the other hand, 28 is a battery as an internal jilt power source, and this battery 28 is a primary battery such as a paper battery made of lithium, which converts chemical reactions into electrical energy. The negative terminal of the battery 28 is connected to the GND terminal, and the output of the positive terminal is given to one input terminal of the switch section 32 and one terminal of the voltage detection section 34.

The other terminals of the switch section 32 and the voltage detection section 34 are connected to a terminal (not shown) to receive a system drive power source CC as an external power source supplied to the CC terminal.

Here, the switch section 32 and the voltage detection section 34 are constructed as shown in FIG. First, the switch section 32
It has MOS transistors 321 and 322, and the voltage detection section 34 includes a Schmitt inverter 341 and an inverter 342.
, and has a resistor 343. In the switch section 32, the system drive power supply VCC is outputted via the PMOS transistor 321, and the output of the battery 28 is outputted via the PMOS transistor 322.

On the other hand, in the voltage detection unit 34, the system drive power supply vCC
is given to the Schmidt inverter 341, and
It is applied to GND via a resistor 343. In this case, when the system driving power VCC is supplied, an rHJ output is given to the Schmitt inverter 341, and when the system driving power VCC is not supplied, an rLJ output is given to the Schmitt inverter 341. The output of Schmitt inverter 341 is applied to PMOS transistor 321 and also to inverter 342. Then, the output of the inverter 342 is the PMOS transistor 32
1 is given. Note that the output of the battery 28 is given as a driving power source for the Schmitt inverter 341 and the inverter 342.

The output of the switch section 32 thus constructed is the circuit block A.
The system program ROM 15, working RAM 16, central controller 17, and timer 26 constitute the
, read/write controller 18, storage memory 25, comparator 27, selector 30 . In addition to the shooting frequency divider 31, the signal is supplied to a display controller 19 and a key controller 20.

On the other hand, the above-mentioned system driving power supply Vcc is connected to an answer-to-reset data ROM 12, an application ROM 13, and a test program ROM 14, which constitute a circuit block B that is used only when connected to a terminal (not shown).
, input buffer? 21, input controller 22, output buffer 23, output controller 24 and frequency divider 33.

The selector 30 selects the oscillation/frequency divider 31 and the frequency divider 33. When the system drive voltage VCC is applied, the selector 30 selects the frequency divider 33, and when only the output from the battery 28 is applied, the selector 30 selects the oscillation/frequency divider 31 and the frequency divider 33. - Select the minute IF filter 31 and supply this output to each circuit.

In this case, the oscillator/frequency divider 31 is used when the card is used as a standalone card without connecting it to a terminal, and generates a low frequency clock signal, for example, 30 KHz, and the frequency divider 33 is used to generate a low frequency clock signal, for example, 30 KHz. This is used when connecting to a terminal, and by attaching it to a terminal (not shown), C
The clock signal applied to the lock terminal is frequency-divided to output a high frequency clock signal, for example, 60 KHz. 31a is a resistor for determining the oscillation time constant of the oscillation frequency divider 31.

Note that Re5et is a terminal to which a reset signal is applied from the terminal.

Next, the operation of the embodiment configured as described above will be explained.

First, a case where such an IC card is used by being attached to a terminal (not shown) will be described. In this case, when an IC card is connected to the terminal, a system driving voltage VCC is supplied to the VCC terminal as an external power source. Then, this system drive voltage VCC is applied to the answer-to-reset data ROM 12 and application ROM 13 of circuit block B, which are used only when connected to the terminal.
, test program ROM 14, input buffer 21, input controller 22, output buffer 23, output controller 24, and frequency divider 33. Further, the system drive voltage VCC is supplied to the switch section 32 and the voltage detection section 34.

Then, in FIG. 2, the input of the Schmitt inverter 341 of the voltage detection section 34 becomes "H" and the output becomes rLJ, so the rLJ signal is given to the PMOS transistor 321 of the switch section 32, and the transistor 321 is turned on. . In this case, the output r of the Schmidt inverter 341
LJ is applied to the inverter 342, and the inverter 34
2, the input is "L" and the output is rHJ, so the rHJ signal is applied to the PMOS transistor 322 of the switch section 32, and the transistor 322 remains in the off state. As a result, the system drive voltage VCC is applied to the system program ROM 15 of the circuit block A and the working R through the PMOS transistor 321 of the switch section 32.
AM16, central controller 17, timer 26,
Read/write controller 18, storage memory 2
5. In addition to the comparator 27, selector 30, and oscillation frequency divider 31, the signal is also supplied to the display controller/driver 19 and key controller 20.

Then, with the system driving power supply Vcc being supplied to the circuit blocks A and B in this manner, a predetermined operation of the IC card is executed.

Next, the case where the IC card is used alone will be explained. In this case, since the IC card is not connected to the terminal, v
CC terminal for system drive as external power supply 1! IVC
C is never supplied.

Then, in FIG. 2, the input of the Schmitt inverter 341 of the voltage detection section 34 becomes "L" and the output becomes rHJ, so the rHJ signal is given to the PMOS transistor 321 of the switch section 32, and the transistor 321 remains off. Then, the output "H" of the Schmidt inverter 341 is given to the inverter 342, and the inverter 3
Since the input of 42 is "H" and the output is rLJ, the rLJ signal is applied to the PMOS transistor 322 of the switch section 32, and the transistor 322 is turned on. As a result, the output of the battery 28 is transmitted through the PMO8 transistor 322 of the switch section 32 to the system program ROM 15, working RAM 16, central controller 17, timer 26, read/write controller 18, storage memory 25, comparator 27 of the circuit block A. , a selector 30, and an oscillation frequency divider 31, as well as a display controller/driver 19 and a key controller 20. In addition, in this case, system drive ff1lVc
Since c is not supplied, the answer-to-reset data ROM 12, application ROM 13, and circuit block B are used only when connecting to the terminal.
Power is not supplied to the test program ROM 14, input buffer 21, input controller 22, output buffer 23, output controller 24, and frequency divider 33.

Then, with the output of the battery 28 being supplied only to the circuit block A in this manner, a predetermined operation is performed by the IC card alone.

Therefore, by doing this, the internal circuit of the I'C card can be divided into a circuit block that is driven by external power only when connected to a terminal, a circuit block that is driven by external power when connected to a terminal, and a circuit block that is driven by external power only when connected to a terminal, and a circuit block that is driven by external power when connected to a terminal, and a circuit block that is driven by external power only when connected to a terminal. When the card is used separately, it is divided into circuit blocks that are powered by the built-in power supply, and when the card is used alone, it is possible to prevent the internal power supply from supplying power to the circuit blocks that are used only when connected to the terminal. Therefore, when the card is used alone, the built-in power supply does not supply power to unnecessary circuits, so unnecessary power consumption can be completely eliminated. If the built-in power source is a primary or secondary battery, this will extend the battery life, which is economically advantageous, and if the internal power source is a solar cell, the cell area will be reduced. It has the advantage that it can be made as small as possible and can be applied to IC cards with size restrictions.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications without changing the gist.

For example, as the above-mentioned switch section 32 and voltage detection section 34, those shown in FIG. 3 may be used. In this case, the switch section 32 includes a PMOS transistor 323 and a diode 324, and the voltage detection section 34 includes a Schmitt inverter 344 and a resistor 345. And, in the switch section 32, for system driving? tfiVc
ctJ (is output via the PMOS transistor 323, and the output of the battery 28 is output via the diode 324).

In this case, it is necessary to make the voltage level of the system drive power supply CC output through the PMOS transistor 323 higher than the voltage level of the battery 28. On the other hand, in the voltage detection section 34, the system drive power supply Vcc is applied to the Schmitt inverter 344, and the
45 to GND. In this case, when the system drive power supply CC is supplied, an rHJ output is given to the Schmitt inverter 344, and the system drive power supply V
When cc is not supplied, Schmitt inverter 344 is provided with an rLJ output. The output of Schmitt inverter 344 is then given to PMOS transistor 323. Even in this case, the same effects as in the above-mentioned embodiment can be expected.

[Effects of the Invention] According to the present invention, when the card is used alone, the circuit block used only when connecting to the terminal includes 1i3E.
Since the supply of power is prevented, it is possible to provide an IC card within the power supply that can eliminate unnecessary power consumption when the card is used alone.

[Brief explanation of the drawing]

Figure 1 is one example of this invention! A block diagram showing a circuit configuration showing an example, FIG. 2 is a circuit diagram showing a switch section and a voltage detection section used in the same embodiment, and FIG. 3 is a circuit diagram showing a switch section and voltage detection section used in another embodiment of the present invention. FIG. 28...Battery, 30...Selector, 32...Switch section, 34...Voltage detection section, A, B...Circuit block. Applicant Casio Computer Co., Ltd. wcz diagram GND Figure 3

Claims (1)

[Claims] In an IC card that has a built-in power supply and is supplied with external power from the external terminal by being attached to an external terminal, a first circuit block to which only the external power is supplied is switched between the external power supply and the built-in power supply. An IC card with a built-in power supply, comprising: a power supply switching means; and a second circuit block to which the external power supply or the built-in power supply is supplied via the power supply switching means.