JP2002049441A - Pc card and driving voltage switching system for pc card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide such a PC card that a driving voltage is changed without decomposing the PC card, and the production cost is reduced. SOLUTION: This PC card is provided with a connector 11 to be connected to a high order host 2 so as to be operated by a prescribed driving voltage to be supplied from the high order host 2 through the connector 11 so that a prescribed function can be realized. The connector 11 is provided with a voltage setting terminal 11a and a ground terminal 11b for checking the driving voltage of the PC card 1 main body from the high order host 2, and a fuse 12 to be melt-cut by currents from the outside part is arranged between the voltage setting terminal 11a and the ground terminal 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC card, and more particularly, to a PC card operated by a drive voltage supplied from a host. The present invention also relates to a drive voltage switching system for a PC card.

[0002]

2. Description of the Related Art In recent years, with the spread of small information devices such as notebook personal computers, many extension devices corresponding to these devices have been developed. These extension devices are, for example, memory cards, SCSI cards, modem cards, and the like. These extension devices are formed in a card type so that they can be connected to small information devices.

[0003] In general, a card type device used in recent years is an information medium called a PC card, and a PCMC.
It conforms to the IA (Personal Computer Memory Card International Association) standard. This PC card is
For example, the same size as a credit card (85.6 mm x 5
4.0 mm), has a thickness of 5.0 mm, and a 68-pin connector is formed in the short side direction. Then, this connector portion is inserted into a notebook personal computer or the like, and the PC card is used. That is, a card slot for mounting a PC card is formed on the notebook personal computer side.

The PC card is supplied with drive power from a host such as a notebook computer to which the PC card is mounted. Therefore, terminals for power supply are formed in the card slot on the notebook computer side and the connector on the PC card side, and the terminals are connected to each other.

[0005] Heretofore, the voltage supplied from a notebook personal computer or the like to a PC card has been 5 V, which is a standard power supply voltage of a semiconductor device. However, in recent years, many PC cards operating at 3.3 V have been commercialized for power saving. Therefore, there are two operating voltages of the PC card, 5 V and 3.3 V. The operating voltage of the PC card is determined by the state of a voltage setting terminal that is a part of the PC card-side connector. Therefore, the upper-level host determines the supply voltage to the PC card by examining the state of the voltage setting terminal, and supplies the voltage corresponding thereto.

[0006]

However, manufacturers need to manufacture a PC card having an operating voltage of 5 V, 3.3 V, or both voltages. Voltage must be set.
That is, it is necessary to use components corresponding to each operating voltage, and several types of designs are required even if the functions are the same.

For example, when a PC card having the same function is supplied to a plurality of businesses, a single 5V operation is performed for the convenience of the businesses (for example, when the operation is desired to be used in a stable state). There is a case in which there is a business operator who wants a PC card that can drive both 5 V and 3.3 V. In such a case, it is necessary to make the components separately by changing the components to be mounted, and there has been a problem that the manufacturing cost is increased due to the increase in the number of components used and the number of designs.

In addition, if the wrong quantity is produced for the demand, it must be disassembled and modified. However, disassembling the PC card structurally destroys its appearance, and such an act makes the PC card unusable as a product. Therefore,
If the stock is left, the product cannot be remodeled and used, causing a problem of waste in production management.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a PC card capable of improving the disadvantages of the prior art, changing the drive voltage without particularly disassembling the PC card, and reducing the production cost. It is an object of the present invention to provide a drive voltage switching system for a PC card.

[0010]

In order to achieve the above object, according to the present invention, a connector connectable to an upper host is provided at an end portion, and a predetermined connector supplied from the upper host via this connector is provided. In a PC card which operates by a driving voltage of the PC card and realizes a predetermined function, a connector is provided with a voltage setting terminal and a ground terminal for checking a driving voltage of the PC card body by an upper host, and the voltage setting terminal and the ground terminal are provided. And a fuse which is blown by a predetermined level of current from the outside.

Therefore, according to the first aspect of the present invention, first, the PC card is connected to the upper host, and the upper host examines whether the voltage setting terminal and the ground terminal are electrically connected to each other. The drive voltage supplied to the card is set. Then, depending on whether the fuse provided between the terminals is blown or not, whether or not the voltage setting terminal is electrically connected to the ground terminal changes, and accordingly, the supplied driving voltage also changes.

Therefore, by applying a voltage to the voltage setting terminal and the ground terminal and blowing the fuse with a current of a predetermined level flowing at this time, even after the PC card is manufactured, the attribute of the PC card can be maintained without being disassembled. That is, the drive voltage can be changed. As a result, two types of products can be manufactured with the same design, the development cost can be reduced, and the attributes of the products can be changed according to demand even after manufacturing,
It is possible to efficiently ship the inventory without bias in the types of products to be shipped, and to reduce production costs.

According to a second aspect of the present invention, in the PC card according to the first aspect, a resistor having a predetermined resistance value and a predetermined capacitance are connected in series between the voltage setting terminal and the ground terminal in place of the fuse. A fuse and a fuse are provided.

For this reason, the invention according to claim 2 has the same function as the above-described invention according to claim 1, and furthermore, the higher-level host controls the resistance value and the non-conductivity between the voltage setting terminal and the ground terminal during conduction. It is investigated whether or not it is conductive, and the drive voltage to be supplied to the PC card is set based on it. Therefore, the voltage is changed by the value of the resistor provided between the voltage setting terminal and the ground setting terminal.

Therefore, by providing resistors having different resistance values, PC cards having different drive voltages can be manufactured, and development costs can be reduced. Further, by blowing fuses, different drive voltages can be obtained. The product attributes can be changed according to demand even after manufacturing, and the types of products to be shipped are not biased and inventory can be shipped efficiently, reducing production costs. Reduction can be achieved.

According to the third aspect of the present invention, a connector having a plurality of terminals for connection to an upper host is provided at one end of the PC card, and the connector has a voltage setting terminal for checking a drive voltage of the PC card body by the upper host. A ground terminal is provided, and a voltage applicator that can be externally connected is provided between the terminals. Then, a configuration is adopted in which a fuse that is blown by an output current from the voltage applicator is provided between the voltage setting terminal and the ground terminal of the connector.

For this reason, in the third aspect of the invention, similarly to the first aspect of the invention, the host checks whether the voltage setting terminal and the ground terminal are electrically connected or not. Since the supplied drive voltage is set, a voltage is applied to the voltage setting terminal and the ground terminal,
By blowing the fuse with the current flowing at this time,
Even after manufacturing the PC card, the P
The attribute of the C card, that is, the drive voltage can be changed. Therefore, two types of products can be manufactured with the same design, the development cost can be reduced, and the attributes of the products can be changed according to the demand even after the manufacturing, so that the products are shipped. Inventory can be shipped efficiently without bias in product types, and production costs can be reduced.

Further, since the voltage application device is used for blowing the fuse, the manufacturer can quickly and easily switch the drive voltage of the PC card at the time of shipment according to the demands of the customer, thereby improving the production efficiency. Improvement can be achieved.

According to a fourth aspect of the present invention, in the driving voltage switching system for a PC card according to the third aspect, a resistor having a predetermined resistance value is connected in series in place of the fuse between the voltage setting terminal and the ground terminal. A fuse having a predetermined capacity is provided.

Therefore, the invention according to claim 4 has the same functions and effects as the invention according to claim 2 in addition to having the same functions as those of the invention according to claim 3 described above.
The above object can be achieved.

According to the fifth aspect of the present invention, a connector having a plurality of terminals for connection to an upper host is provided at one end of the PC card, and the connector has a voltage setting terminal for checking a drive voltage of the PC card body by the upper host. A host terminal is provided with a ground terminal and a current output control function capable of outputting a predetermined level of current between the terminals.
Then, a configuration is adopted in which a fuse that is blown by an output current from the current output control function is provided between the voltage setting terminal and the ground terminal of the connector.

Therefore, in the invention of claim 5, similarly to the invention of claim 1, the host checks whether or not the voltage setting terminal and the ground terminal are electrically connected to each other. Since the supplied drive voltage is set, a current is output between the voltage setting terminal and the ground terminal by a current output function, and the fuse is blown by this current, so that the PC card is decomposed even after being manufactured. Without changing the attribute of the PC card, that is, the drive voltage can be changed. Therefore, two types of products can be manufactured with the same design, the development cost can be reduced, and the attributes of the products can be changed according to the demand even after the manufacturing, so that the products are shipped. Inventory can be shipped efficiently without bias in product types, and production costs can be reduced.

Further, since the fuse can be blown by the current output control function provided in the host, the drive voltage of the PC card can be easily changed, and even after the user has purchased the PC card. The attributes of the product can be changed according to the mode of use. Therefore, since the user can use any type of product regardless of the type of product, the user can easily select the product at the time of purchase, and the manufacturer can efficiently ship the inventory without bias in the types of products to be shipped. And production costs can be reduced.

According to a sixth aspect of the present invention, in the PC card driving voltage switching system according to the fifth aspect, a resistor having a predetermined resistance value is connected in series between the voltage setting terminal and the ground terminal in place of the fuse. A fuse having a predetermined capacity is provided.

Therefore, the invention according to claim 6 has the same functions and effects as the invention according to claim 2 in addition to the same functions and effects as the invention according to claim 5 described above.
The above object can be achieved.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS.

FIG. 1 is a schematic diagram of a PC card 1 according to the present invention. In FIG. 1, a PC card 1 is a PCMCI
A (Personal Computer Memory Card International Association)
It conforms to the standard. This PC card 1 has the same size as a credit card (85.6 mm × 5).
(4.0 mm), a thickness of 5.0 mm, and a 68-pin connector 11 formed in the short side direction (T).
ype2). However, the shape of the PC card 1 is not limited to the above description. For example, if the thickness is 3.3
mm (Type 1) or 10.5 mm (Type
3) or a shape extended in the long side direction (Extended). Furthermore, a small PC card in which the PC card is small (45.0 mm × 42.8 mm) may be used.

The PC card 1 has a connector 1
1 is connected to the host 2 (see FIG. 2), and a normal drive voltage (for example, 5
V) to realize the function of the PC card 1 itself. That is, circuits for realizing various functions are configured inside the PC card 1.

Here, the upper host 2 is, for example, a notebook personal computer, a desktop personal computer, a card reader, a digital camera or the like, but is not limited to these examples. The PC card 1 is, for example, a flash A
Examples include a TA card, a fax / modem card, and a SCSI card, but are not limited to these examples.

As described above, the connector 11 has 68
Terminals are provided, in which a voltage setting terminal 11a and a ground terminal 11b are formed. The voltage setting terminal 11a and the ground terminal 11b are conductive. A power supply terminal 11c for driving voltage of the PC card 1 supplied from the host 2 is also formed. The other terminals are formed with terminals for transmitting and receiving data between the PC card 11 and the host 2.

This connector 11 is, as shown in FIG.
When connected to the host 2, it is connected to the connector 21 of the host 2. Terminals (voltage setting terminals 21a, ground terminals 21b, and power terminals 21c) corresponding to the terminals (voltage setting terminals 11a, ground terminals 11b, and power terminals 11c) of the PC card 1 are provided on the connector 21 on the host 2 side. Are formed, and when the PC card 1 and the host 2 are connected, each terminal is connected.

When the connectors 11 and 21 are connected to each other, as described above, the PC card 1 obtains a drive voltage from the host 2 via the power supply terminals 11c and 21c. Operates to realize various functions.

Here, in the PC card 1, a fuse 12 is provided between the conductive voltage setting terminal 11a and the ground terminal 11b. That is, one end of the fuse 12 is connected to the voltage setting terminal 11a, and the other end is connected to the ground terminal 11b. The fuse 12 is blown by a predetermined level of current.

The host 2 is provided with a conduction detector 22 for checking whether the voltage setting terminal 11a and the ground terminal 11b of the PC card 1 are conducting. Then, a voltage to be supplied to the PC card 1 is set based on the result of the investigation by the continuity detector 22, and the set voltage is supplied to the PC card 1. Therefore, the host 2 has a power supply 23 for supplying such a voltage to the PC card 1.

More specifically, the conduction detector 22 includes a voltage setting terminal 21a and a ground terminal 21b on the host 2 side.
And a weak current flows between the voltage setting terminal 11a on the PC card 1 side and the ground terminal 11b. Due to this weak current, the voltage setting terminal 11a and the ground terminal 11b on the PC card 1 side are connected.
A check is made to see if there is continuity. For example, if the voltage setting terminal 11a is conducting, the power supply 23
When a voltage of 3.3 V is supplied to the card 1 and it is not conducting, a voltage of 5 V is supplied from the power supply 23 to the PC card 1. Here, the case where the voltage setting terminal 11a and the ground terminal 11b are not conductive is the case where the fuse 12 provided between the voltage setting terminal 11a and the ground terminal 11b is blown (see FIG. 4). The weak current for checking the drive voltage flowing from the conduction detector 22 is not at an output level enough to blow the fuse described above.

Thus, the host 2 can detect information on the drive voltage of the connected PC card 1 and supply the drive voltage corresponding to the information. Therefore, when a voltage outside the driving range of the PC card 1 is applied to the PC card 1 and the PC card 1 is not driven,
While being able to suppress that it breaks down,
Even after manufacturing the PC card, by blowing the fuse 12, the attribute of the PC card, that is, the drive voltage can be changed, so that two types of products can be manufactured with the same design, and the development cost can be reduced. Can be reduced.

Here, the voltage applicator 3 used to blow the fuse 12 will be described.
A drive voltage switching system for a PC card including the voltage applicator 3 will be described with reference to FIG.

The voltage applicator 3 is adapted to be connected to the PC card 1 and the connector 11 of the PC card 1
Is provided. It is not necessary for the connector 31 on the voltage applicator 3 side to have terminals corresponding to all the terminals of the connector 11 on the PC card 1 side. At least the voltage setting terminal 1 on the PC card 1 side
1a and a terminal corresponding to the ground terminal 11b (the voltage setting terminal 31a on the voltage applicator side, the ground terminal 3).
1b) may be formed. The voltage applicator 3 is provided with a power supply 32 and a resistor 33, and a voltage is applied between the voltage setting terminal 11a on the PC card 1 side and the ground terminal 11b via the terminals 31a and 31b. Is applied.

With this applied voltage, a current flows through the fuse 12, and if the current is a sufficiently large value, the fuse 1
2 is melted, and the voltage setting terminal 11a and the ground terminal 11
b is non-conductive. Note that the resistor 33 is for limiting the current to prevent an excessive load from being applied to the power supply.

Here, the case where the fuse 12 is blown by the voltage applicator 3 has been described above, but the present invention is not necessarily limited to this. Voltage setting terminal 11 of PC card 1
A current may be output from the host 2 between the terminal a and the ground terminal 11b, and the fuse 12 may be blown by this current. That is, the host 2 may be provided with a current output control function of outputting a predetermined level of current between the voltage setting terminal 11a and the ground terminal 11b of the PC card 1.

The current output control function is such that a predetermined level of current flows between the voltage setting terminal 11a and the ground terminal 11b of the PC card 1 through the connector 21 of the host 2 in accordance with a command from the user. 12 is blown. Specifically, for example, when the user purchases the PC card 1 and wants to change the drive voltage of the PC card 1, the user instructs the host 2 to change the drive voltage of the PC card 1. In response to this command, the host 2 uses the current output control function to supply a current of a level that blows a fuse between the voltage setting terminal 11a and the ground terminal 11b of the PC card 1 from the power supply 23 via the conduction detector 22. To blow the fuse 12. This allows the user to
Even after purchasing the product, the drive voltage can be changed to the drive voltage that the user wants to use.

Next, the operation of this embodiment will be described.

First, the PC card 1 is connected by a user to a card slot formed in an upper host 2 such as a notebook personal computer at the time of use. At this time, the conduction detector 22 of the host 2 checks whether the voltage setting terminal 11a and the ground terminal 11b of the PC card 1 are conducting or not (see FIG. 2).

According to this investigation, the voltage setting terminal 11a and the ground terminal 11b of the PC card 1 are electrically connected. In this case, for example, the driving voltage of the PC card 1 is 3.3V.
When the host is set to recognize that the PC card 1 is powered on, a driving power of 3.3 V is supplied to the PC card 1 from the power supply 21c of the host 2 (see FIG. 2). on the other hand,
Voltage setting terminal 11a and ground terminal 11 of PC card 1
b is non-conductive, that is, the voltage setting terminal 11a
In this case, if the drive voltage of the PC card 1 is set to be recognized as 5 V by the upper host 2, the fuse 12 between the fuse and the ground terminal 11b is blown. , A driving power of 5 V is supplied to the PC card 1 (see FIG. 4).

Here, the voltage setting terminal 1 on the PC card 1 side
A method for blowing the fuse 12 between the ground terminal 1a and the ground terminal 11b will be described.

The fusing of the fuse 12 is performed by the above-described voltage applicator 3. Specifically, the connector 31 of the voltage applicator 3 is connected to the connector 11 of the PC card 1, a voltage is applied from the voltage applicator 3 between the voltage setting terminal 11 a and the ground terminal 11 b, Apply current. If this current is a sufficiently large value, the fuse 12
Blows.

The blowing of the fuse 12 is performed before the manufacturer ships the PC card 1. That is,
For example, the aforementioned voltage setting terminal 11a and the ground terminal 1
If the PC card 1 is designed to operate at 3.3 V if the 1b is conductive and operates at 5 V if it is not conductive, the orderer who wants the PC card 1 operating at 3.3 V alone and the orderer operating at 5 V single operation When there is an orderer who wants the PC card 1, the former is shipped as it is manufactured, and the latter is supplied with the voltage applicator 3
Is shipped with the fuse 12 blown.

As described above, without using the voltage applicator 3, the current output control function provided in the host
The fuse 12 may be blown. In such a case, unlike the case where the drive voltage of the PC card 1 is set before shipment by the manufacturer, the user who purchased the PC card 1 can set the voltage that he or she wants to operate from the host 2.

For example, a user who purchases the PC card 1 which operates at 3.3 V when the voltage setting terminal 11 a and the ground terminal 11 b are conductive and operates at 5 V when the voltage setting terminal 11 a and the ground terminal 11 b are not conductive, for example, in order to save power, is required to be 3 When it is desired to drive the PC card 1 at 3 V, the PC card 1 is used in the purchased state and is driven stably. Therefore, when the PC card 1 is driven at 5 V, the user ranks higher. It issues a fuse blow command to the host 2. When such a command is issued, the current output control function of the host 2 causes a current to flow between the voltage setting terminal 11 a and the ground terminal 11 b, that is, the fuse 12. If this current is a sufficiently large value, the fuse 12 blows.

Therefore, the drive voltage of the PC card 1 can be easily selected according to the user's own will.
The PC card 1 purchased by the user is not incompatible with the host 2 owned by the user, and confusion in product selection at the time of purchase can be suppressed.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a schematic view of the PC card 50.
The PC card 50 has the same basic components as the PC card 1 shown in FIG. Further, in the other embodiment, a resistor 5 having a predetermined resistance value is provided between the conductive voltage setting terminal 51a and the ground terminal 51b.
3 is provided. Accordingly, the drive voltage supplied to the PC card 50 is set based on whether or not the voltage setting terminal 51a and the ground terminal 51b are conducting and the resistance value between the terminals. .

That is, the continuity detector 22 has a function of checking continuity between the voltage setting terminal 51a and the ground terminal 51b and measuring a resistance value between the terminals. The value of the drive voltage supplied to the PC card 50 is set according to the value.

Here, for example, a PC having a resistance of 5Ω
It is assumed that there is a card 50 and a PC card 50 having a resistance of 10Ω. Suppose that the former card was designed to operate at 5V and the latter card was designed to operate at 3.3V. When the fuse 52 is blown, both of them are driven at 5 V / 3.3 V.

When the PC card 50 is connected to the host 2, the continuity detector 22 first checks the continuity between the voltage setting terminal 51a and the ground terminal 51b as described above. The resistance between them is measured. Then, if the measurement result indicates that the resistance is 5 Ω due to conduction, the upper host 2 supplies a driving voltage of 5 V to the PC card 50, and supplies a driving voltage of 3.3 V to the PC card 50 if the resistance value is 10 Ω. I do. In addition, if it is not conducting, 5V / 3.
Because of the 3V dual drive, the power supply voltage of the host 2 is supplied.

When these two types of cards are manufactured, the PC card 50 is shipped as it is to the user who requests the PC card 50 of a single operation of 5 V or 3.3 V. For a user who wants the two-drive PC card 50, the fuse 52 of any one of the two types of PC cards 50 is blown, and the PC card 50 in which the fuse 52 is blown is 5V / 3. 3V dual drive PC
The card 50 can be shipped.

In this manner, two types of PC cards 50 having substantially the same design, the same function, and different driving voltages can be manufactured. Also, the fuse 52
Can be set to a further different drive voltage, so that the PC card 50 can be shipped after the attributes of the PC card 50 are changed according to demand after the manufacture. Therefore, as a result, inventory can be shipped efficiently,
Production efficiency can be improved.

Further, in the other embodiment, similarly to the above embodiment, the current output control function provided in the voltage applicator 3 or the host 2 may be used for blowing the fuse. In such a case, the same effect as that of the above embodiment can be obtained.

[0059]

As described above, according to the PC card of the present invention, the connector is provided with the voltage setting terminal and the ground terminal for checking the drive voltage of the PC card main body by the host, and the voltage setting terminal and the ground are provided. Since a fuse that is blown by an externally applied voltage is provided between the terminal and the terminal, the fuse is blown using the existing terminal without providing a new terminal. Is changed from conduction to non-conduction, thereby changing the driving voltage supplied to the PC card. Therefore, two types of products can be manufactured with the same design, and the development cost can be reduced. Even after manufacturing, the drive voltage of the PC card can be easily changed, so that the types of products to be shipped are not biased and the inventory is efficiently shipped. Bets can be, it is possible to reduce the production costs, it has an excellent effect unprecedented called.

In a drive voltage switching system for a PC card provided with a voltage application device for blowing a fuse, a manufacturer connects a voltage application device to a PC card at the time of shipment according to a demand of a user, and supplies the voltage application device. To apply a voltage to the fuse of the PC card and apply a predetermined level of current to the fuse to blow the fuse. Therefore, the fuse can be blown quickly and easily, and the drive voltage of the PC card can be changed, thereby improving the production efficiency. Has an excellent effect that it can be improved.

Further, in the PC card and the drive voltage switching system for PC card, a resistor having a predetermined resistance value and a fuse having a predetermined capacity are connected in series between the voltage setting terminal and the ground terminal instead of the fuse. Is provided, the host computer examines the resistance between the voltage setting terminal and the ground terminal during conduction and whether or not it is non-conductive, and sets the drive voltage to be supplied to the PC card based on this. Therefore, by providing resistors having different resistance values, PC cards having different drive voltages can be manufactured, and development costs can be reduced. In addition, the drive voltage can be further changed by blowing a fuse. This makes it possible to easily change product attributes according to demand even after manufacturing, and to reduce production costs. Kill, have an excellent effect that.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a use state of the PC card disclosed in FIG. 1;

FIG. 3 is an explanatory diagram showing a case where a fuse disclosed in FIG. 1 is blown;

FIG. 4 is an explanatory diagram showing a use state when a fuse of the PC card disclosed in FIG. 1 is blown;

FIG. 5 is a schematic view showing another embodiment of the present invention.

[Explanation of symbols]

 1,50 PC card 2 host host 3 voltage applicator 11,51 connector (PC card) 12,52 fuse 21 connector (host host) 22 continuity detector 23 power supply (host host) 31 connector (voltage applicator) 32 power supply ( 33 (resistance) (PC card) 11a, 51a Power setting terminal (PC card) 11b, 51b Ground terminal (PC card) 11c Power supply terminal (PC card)

Claims (6)

[Claims] 1. A PC card which has a connector connectable to an upper host at an end thereof and operates by a predetermined drive voltage supplied from the upper host via the connector to realize a predetermined function. The connector is provided with a voltage setting terminal and a ground terminal for checking the drive voltage of the PC card body by the host, and is blown between the voltage setting terminal and the ground terminal by a predetermined level of external current. A PC card comprising a fuse. 2. A fuse having a predetermined resistance value and a predetermined capacitance is provided in series between the voltage setting terminal and the ground terminal in place of the fuse. PC card as described. 3. A connector having a plurality of terminals for connecting an upper host at one end of the PC card, and the connector is provided with a voltage setting terminal and a ground terminal for checking a drive voltage of the PC card body by the upper host. Along with
An externally connectable voltage applicator is provided between the terminals, and between the voltage setting terminal and the ground terminal of the connector,
A drive voltage switching system for a PC card, wherein a fuse blown by an output current from the voltage applicator is provided. 4. A resistor having a predetermined resistance value and a fuse having a predetermined capacity are provided in series between said voltage setting terminal and a ground terminal in place of said fuse. The drive voltage switching system for a PC card as described in the above. 5. A connector having a plurality of terminals for connecting an upper host at one end of the PC card, and the connector is provided with a voltage setting terminal and a ground terminal for checking a drive voltage of the PC card body by the upper host. Along with
The upper host has a current output control function capable of outputting a predetermined level of current between the terminals, and between a voltage setting terminal and a ground terminal of the connector,
A drive voltage switching system for a PC card, wherein a fuse blown by an output current from the current output control function is provided. 6. A resistor having a predetermined resistance value and a fuse having a predetermined capacity are provided in series between the voltage setting terminal and the ground terminal in place of the fuse. The drive voltage switching system for a PC card as described in the above.