JPH021009A - IC card with built-in battery - Google Patents

Abstract

PURPOSE:To prevent the consumption of a battery in the period from shipping to delivery to a user by providing a switch element initialized to the switching- off state between the backup battery and a RAM and switching on the switch element at the time of use. CONSTITUTION:In the stage of shipping of an IC card from a factory, a switch element 15 is kept in the switching-off state by the switching-off signal from a latch circuit 16, and the power consumption can be almost ignored because power is consumed only in the circuit 16. Just before the card 1 is delivered from the card issue source to the user, the card 1 is set to an IC card terminal 20, and the card 1 is commanded to set signal '1' to the circuit 16 by the key input part of the terminal 20. This command is inputted to a CPU 11 through an I/O terminal (a) of a connector part 4 and sets signal '1' to the circuit 16 through a signal line 11a to switch on the element 15. Thus, the power of a battery 14 is supplied as the backup power to a RAM 13, and it can be accessed.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a battery built-in IC card.

[Conventional technology and its problems] In recent years, 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. There is. Credit cards of this type have traditionally stored information using magnetism, but they have a small amount of information storage and also have problems with card authentication. For this reason, in recent years, cards have been equipped with ICs consisting of data processing circuits, data storage memory, etc.
Information cards incorporating circuits, so-called IC cards, have been developed. According to this IC card, a very large amount of information can be stored and excellent authentication performance can be achieved.

Therefore, in the upper IC card, EFROM or L2 is used as the memory for storing information. It is conceivable to use AM. When RAM is used, stored data can be rewritten very easily, but it is necessary to include a backup battery. However, as mentioned above, devices with a built-in backup battery are generally configured to back up the RAM from the time of shipment from the factory, so current flows to the RAM and the battery The longer it takes from the factory to reach the user, the more the user's
There is a problem that the validity period during which the C card can be used becomes shorter.

[Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a battery built-in IC card that can prevent wasteful power consumption of a backup battery and extend the usage period of the TC card. With the goal.

[Summary of the Invention] The present invention provides a switch element between a backup battery built into an IC card and a RAM, and maintains the backup circuit in an off state by the switch element until actual use, thereby reducing battery waste. This is to prevent excessive power consumption.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows the external configuration of the IC card 1. The IC card 1 has a keyboard 2, a liquid crystal display section 3, and a keyboard 2 on its top surface.
A connector section 4 is provided for connection to an IC card terminal to be described later. The keyboard 2 includes various operation keys such as a numeric keypad, a display off key OFF, a time key T1, a date key D1, a time/mouth switch key T/D, and a PIN key. An electronic circuit and a battery, the details of which will be described later, are sealed and built into the IC card 1.

Next, the configuration of the electronic circuit provided in the IC card 1 will be explained with reference to FIG. 2. In Figure 2, 11 is C
The keyboard 2, display section 3, and connector section 4 are connected to the CPU 11 of the PU.

This connector section 4 includes, for example, I10 terminal a1 reset terminal b1 clock terminal c, VCC power supply terminal d1 ground (G
ND) terminal e, etc. (the other terminal is omitted because it is not used). Further, a RAM 13 for data storage is connected to the CPU II via a pass line 12. This RAM 13 is configured using, for example, a C-MOS transistor, and is supplied with backup power from a vapor battery 14 via a switch element 15 . The switch element 15 is constituted by, for example, a MOS transistor, and is supplied with an on/off control signal from a latch circuit 16. This latch circuit 16 is C-
, MOS) transistors, and is supplied with operating power from the battery 14. In the initial state, the latch circuit 16 gives an off signal to the switch element 15, and sends the signal line ll from the CPU II to the
When the “1° signal is set via a, switch cable 1
5 to give an on signal. Further, the negative terminal of the battery 14 is connected to the ground terminal e of the connector section 4. IC card 1 configured as above
In this case, operating power is supplied from the battery 14 only to the RAM 13, switch element 15, and latch circuit 16, and other circuit elements are supplied with power from the card issuer, bank, store, etc., as shown in FIG. When the IC card terminal 20 is installed, the IC card terminal 2
The Vece source is supplied from 0.

When the IC card 1 configured as described above is shipped from the factory, the switch element 15 is held in the off state by the off signal from the latch circuit 16, and f? Backup power from the battery I4 is not supplied to AM13. Therefore, the power consumption only by the latch circuit 16 is very small and can be almost ignored.

Then, the IC card 1 shipped from the factory is sent to the card issuer, and the RAM 13 is set to a usable state immediately before being handed over to the user by the card issuer.

That is, the card issuer attaches the IC card 1 to the IC card terminal 20 as shown in FIG.
A command is given to set the "1" signal. This "1" signal set command is input to the r CPUI 1 through the I10 terminal a of the connector section 4. CPUII is an IC
Signal line 11 by command from card terminal 20
A "1" signal is set in the latch circuit 16 via the terminal a, and the switch element 15 is turned on. When the switch element 15 is turned on, the battery 14 is supplied to the RAM 13 as a backup power source, and the RAM 13 is
13 can be accessed. Since the latch circuit 16 uses the battery 14 as its power source, when it latches the "1" signal from the CPU 11, it maintains this state until the battery 14 becomes unusable and continues to supply power to the RA!413. , CPt1ll outputs a "1" signal to the latch circuit 16 to turn on the switch element 15, writes specific data to the RAM 13, reads it again, checks whether the RAM 13 operates normally, and then The result is output to the IC card terminal 20.The IC card terminal 20 determines whether or not the IC card 1 can be handed over to the user based on the check result sent from the IC card 1, and displays the determination result on the display section. instruct.

The card issuer checks the contents displayed on the IC card terminal 20, and if the card check result is OK, hands the IC card 1 to the user. Then, by the user registering the PIN number on the IC card 1,
It becomes possible to actually use the IC card 1.

[Effects of the Invention] As detailed above, according to the present invention, the backup battery built into the IC card and the I? A switch element that is initially set to the OFF state is provided between the IC card and the AM, and the switch element is turned on during actual use to supply backup power to the RAM. Can you extend the usage period of your IC card by preventing wasteful power consumption of the backup battery until it is used? It is worth 1J.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. FIG. 1 is a perspective view showing the external configuration of an IC card, FIG. 2 is a block diagram showing the configuration of an electronic circuit provided in the IC card, and FIG. This shows the connection relationship between an IC card and an IC card terminal. DESCRIPTION OF SYMBOLS 1...IC card, 2...Keyboard, 3...Display section, 4...Connector section, 11...CPU, 12
...Pass line, 13...RAM, 14...Battery, 15...Switch element. Applicant Casio Computer Co., Ltd.

Claims (1)

[Claims] In an IC card having a built-in battery, a RAM for data storage to which backup power is supplied by the battery.
a switch element provided between the RAM and the battery; a latch circuit initially set to turn off the switch element; and means for causing the latch circuit to latch an on signal to the switch element using an external signal. A battery built-in IC card characterized by comprising: