KR20050058819A - Dual mode universal serial bus memory apparatus and mobile communication terminal supporting the same - Google Patents

Abstract

The present invention relates to a dual-mode universal serial bus memory device and a mobile communication terminal supporting the same, wherein a USB port included in a general-purpose serial communication (USB) memory device applied to a personal computer operates in a slave mode. The internal USB port also operates in slave mode, so the USB memory device used for the PC cannot be directly connected to the mobile terminal, and even if a dedicated USB memory device is developed for the mobile terminal, There was a problem that it was difficult to add a bulky standard USB interface to connect a USB memory device. In view of the above problems, the present invention provides a switch for allowing a user to manually select a power source, a USB port in which one of a master mode and a slave mode is selected as a power source selected by the switch operation, and a standard for connecting to a PC side. A dual mode USB memory device including a dedicated USB interface for a mobile communication terminal using a four terminal ear jack of a mobile terminal with a USB interface, and an internal USB port is connected to the four terminal ear jack socket to enable connection with the dual mode USB memory device. By providing a mobile terminal that supplies power to one of the terminals, the memory of the mobile terminal can be easily expanded, and the information of the mobile terminal can be easily shared with other mobile terminals or a PC. have.

Description

DUAL MODE UNIVERSAL SERIAL BUS MEMORY APPARATUS AND MOBILE COMMUNICATION TERMINAL SUPPORTING THE SAME}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual mode universal serial bus memory device and a mobile communication terminal supporting the same, and more particularly, to a personal computer (hereinafter referred to as a personal computer) supporting a universal serial bus (USB) communication method. The present invention relates to a dual-mode USB memory device having a USB port and a type-specific connection interface that supports selection of a master mode and a slave mode to be applicable to both a mobile communication terminal and a mobile communication terminal.

As the use of mobile communication terminals has been generalized, the market of mobile communication terminals has been expanded. Accordingly, the development of mobile communication terminals with more functions has been rapidly achieved.

In particular, high-performance controllers, large memory capacity, and colorful displays have become basic conditions for general mobile terminals. By using them, a large amount of personal information can be used more conveniently, and various multimedia data can be generated and reproduced. Therefore, in order to store and manage such a large number of information in the mobile communication terminal, data communication is gradually increased by connecting the mobile communication terminal to a personal computer.

Recently released mobile communication terminals support Universal Serial Bus (USB), which can transmit and receive a lot of data more quickly with an external data processing device (for example, a PC).

The internal data of the mobile communication terminal can be moved and organized through the connection with the PC. However, due to the use of large-capacity multimedia data, which has recently increased rapidly, the memory embedded in the mobile communication terminal has made it difficult to use such multimedia data. .

The only way to overcome this is to use the memory device in a mobile communication terminal that supports a memory medium (various types of multimedia storage media) while detaching the memory device and to frequently empty internal information by connecting to a PC. It is not possible to store them all in the memory of the communication terminal.

However, the mobile communication terminal employing such a memory medium has low practicality due to the increase in volume due to the mounting and detachment of a memory medium which must be physically configured, and requires a separate media reader to be applied to a personal computer. It is inconvenient to use for exchanging or sharing the memory, so it is rarely used as part of this simple memory increase. Therefore, a commonly used method uses a method of connecting only with a PC to exchange internal information and storing only necessary information in the mobile communication terminal. In order to connect a mobile terminal and a PC through such USB communication, a wired cable connecting them is required, and its volume is quite large. Therefore, even when a portable notebook computer is used to manage information of a mobile communication terminal, it is difficult to carry a bulky notebook computer and a connection cable for a small sized mobile communication terminal. Therefore, the mobile communication terminal currently uses only limited memory space, and it is difficult to expand and store more data.

In addition, when the internal information of the mobile communication terminal is desired to be transmitted to another mobile communication terminal, there is a problem in that the cost is generated or the location is severely restricted because a multimedia message service or a personal computer should be used as an intermediate medium.

The PC uses a USB memory device as a simple and convenient storage medium to solve this problem, which is connected to the USB port built into the PC to exchange information with the built-in mass memory. When the USB memory device is connected to the USB port, the PC recognizes it in real time and regards it as one independent storage space (recognized as a hard disk). That is, a PC can access internal USB memory from time to time, use internal information, and record and delete information if necessary.

Therefore, if predetermined information is recorded in the USB memory and mounted in another PC, the recorded information can be used in the corresponding PC. This makes it easy to transfer information between PCs without the need for bulky, long communication cables, bulky, difficult-to-handle, and small floppy disks. In addition, there is no need for additional hardware for this purpose, and there is no need to operate a PC power supply, and its use is gradually increasing.

1 is a conceptual diagram illustrating a connection and information exchange method between a conventional USB memory device for a PC and a PC. In the simple connection method, when the USB memory device 20 having the USB interface 23 corresponding to the PC-side USB interface 13 is connected to the PC-side USB interface 13, the PC-side USB port 15 This is detected and communication with the USB port 25 of the memory device 20 is started, thereby allowing the PC 10 to access the memory 27.

In the configuration related to the USB port 15 of the PC 10, weak pull-down resistors R1 and R2 are connected to the data input / output pins D + and D- for data communication, respectively. Thus, when there is no external connection, the voltage applied from the data pins of the PC side USB port 15 is always at ground potential.

In the case of the USB memory device 20, the configuration related to the USB port 25 has a configuration in which one of the input / output pins D + is pulled up by a power supply Vcc applied from the outside. Since the start-up resistor R3 has a smaller resistance than the pull-down resistor used on the PC side, when the USB memory device 20 is connected to the PC 10, the D + terminal of the USB port 15 of the PC side is connected. The voltage rises from the ground potential to the Vcc potential, and the USB port 15 that recognizes this may recognize whether the external USB device is connected and perform an operation accordingly.

One thing to note here is that the communication method used for USB communication is always used as a master and a slave. In other words, the master recognizes the connection of the slave USB device and then controls the slave USB device. In general, the USB port 15 provided by the PC side operates as a master, and all external USB devices connected to the PC side USB port 15 operate in slave mode. Therefore, since the USB port 25 of the USB memory device 20 operates in the slave mode, it notifies the PC side USB port 15 that the slave device USB device is connected through the physical power change as described above. will be.

If a small and large USB memory device for a PC can be applied to a mobile terminal, data exchange between the PC and the mobile terminal can be easily performed, avoiding the use of inconvenient cables, and greatly improving the internal memory expandability of the mobile terminal. Unfortunately, currently used USB memory devices for PCs cannot be applied to mobile communication terminals.

The reason is that since the mobile communication terminal is also designed to be connected to the USB port of the PC, the USB port of the mobile communication terminal also operates in slave mode. That is, when the USB devices operating in the slave mode are interconnected, USB communication is impossible, and thus, the mobile communication terminal and the USB memory device cannot be directly connected.

In addition, the installation of a USB interface that can be directly connected to a USB memory device in a mobile communication terminal is a burden due to the design trend of a mobile communication terminal that strives to reduce its size. Not done.

As described above, the USB port included in the universal serial communication (USB) memory device applied to a conventional personal computer operates in the slave mode, and the USB port included in the mobile communication terminal also operates in the slave mode. USB memory devices cannot be directly connected to a mobile terminal, and even if a USB memory device for mobile terminals is developed, an additional bulky standard USB interface is provided for connecting a USB memory device for a PC to the mobile terminal. There was a problem that was difficult to do.

In view of the above problems, the present invention provides a switch for allowing a user to manually select a power source and a USB port in which one of a master mode and a slave mode is selected as a power source selected by the switch operation, and for connecting to a PC side. Provides a dual-mode USB memory device including a USB interface for a mobile communication terminal using a four-terminal ear jack of the mobile communication terminal along with a standard USB interface, and has an internal USB port connected to the four terminal to enable connection with the dual-mode USB memory device. It is connected to a jack socket and provides a mobile terminal for supplying power to one of the terminals, thereby easily expanding the memory of the mobile terminal and easily sharing the information of the mobile terminal with a PC. To provide a serial bus memory device and a mobile communication terminal supporting the same It is an object.

A dual mode universal serial bus memory device of the present invention for achieving the above object comprises: a standard universal serial bus (USB) interface connected to a personal computer; A four-terminal ear jack USB interface for a mobile communication terminal having a different power supply path from the standard USB interface; A switch for selecting one of the external power supply paths of the USB interfaces by a user's selection; A dual mode USB port in which one of a master mode and a slave mode is selected by an external power source selected by the switch; And a memory connected to the dual mode USB port.

In addition, the mobile communication terminal used in an embodiment of the present invention is a USB port for operating in the slave mode and recognizes the connection of the external device by an external signal; And an internal power supply, a pair of data signal lines provided from the USB port, and a four-terminal ear jack socket USB interface to which ground is connected.

When described in detail with reference to the accompanying drawings of the present invention as described above.

Figure 2 shows the external structure of an embodiment of the present invention, as shown in the interface for connection is provided separately according to the connection target.

That is, a standard USB interface 32 for connecting to an external device that provides a standard USB connection interface such as a personal computer (PC) and the four-terminal ear jack USB interface 33 for a mobile communication terminal newly proposed by the present invention are provided. Each is composed separately. Then, the switch 31 is protruded to the outside so that the user can specify the connection target.

The connected object is designated using the switch 31 and connected to a PC or a mobile communication terminal using the corresponding interface 32 or 33. In particular, since the physical interface with the mobile communication terminal can be performed through the ear jack terminal already formed in the mobile communication terminal, there is no need to install an additional interface, so the present invention can be performed without changing the appearance of the mobile communication terminal. The invention can be applied.

3 is a conceptual diagram showing an operation of an embodiment of the present invention, as shown in the configuration of the dual-mode USB memory device 30 proposed by the present invention, and the configuration of the USB communication unit of the personal computer 10 connected to the configuration described above. And a USB communication unit of the mobile communication terminal 40.

First, looking at the configuration of the dual-mode USB memory device 30, it can be seen that the connection target is provided with different USB interfaces (32, 33), respectively. The communication terminals D + and D- of the USB interfaces 32 and 33 and the grounds are connected in common, and one of the external power sources Vcc provided through each of the interfaces 32 and 33 is connected. It can be seen that it is selected by the switch 31. That is, switching of the switch 31 by the user selects the path of the applied power.

First, when the power provided from the standard USB port 32 is selected, the corresponding power pulls up the D + terminal of the dual mode USB port 35 and simultaneously activates the slave enable (SE) terminal. Mode Allows the USB port 35 to operate in slave mode.

If the switch of the dual mode USB memory device 30 is set toward the PC and the power path is set as described above, and then connected to the PC 10 side interface 13, the dual mode USB memory device 30 is connected to the PC. It is operated by an externally applied power source provided through the power source 17 of (10). In addition, the connection is performed by the pull-up of the D + terminal and at the same time, a Vcc potential is provided to the D + terminal of the PC-side USB port 15, which is operated as a master and the ground potential is applied by the pull-down resistor R2. The PC side USB port 15 is recognized. Through this, the dual mode USB memory device 30 can be used for a PC.

If the user switches the switch 31 and connects the path of the applied power with the power provided through the four-terminal interface 33 for the mobile communication terminal, the power is the power of the entire dual-mode USB memory device 30. The dual mode USB port 35 operates in the master mode by activating a master enable (ME) terminal of the dual mode USB port 35 while being used as a. In general, power should be supplied from a USB port acting as a master to a USB port acting as a slave. However, in this case, the dual mode USB memory device 30 is operated by receiving power from a mobile communication terminal. Be careful.

To this end, the ear jack socket of the mobile communication terminal 40 should be changed to the four-terminal ear jack socket USB interface 43 proposed in the present invention so as to interface with the dual mode USB memory device 30. The four-terminal ear jack socket used for the USB interface is connected to a power source 47 of the mobile communication terminal 40, a pair of data signal lines D + and D- provided from the terminal-side USB port 45, and a ground. do.

After switching the switch 31 of the dual mode USB memory device 30 to select a mobile communication terminal, the four-terminal ear jack socket USB interface 43 and the dual mode USB memory device 30 of the mobile communication terminal are selected. When the four-terminal ear jack USB interface 33 is connected, the dual mode USB memory device 30 is operated in the master mode while being driven by the power of the mobile communication terminal 40. Since the USB port 45 of the mobile communication terminal 40 does not know this, the dual mode USB port 35 transmits the predetermined data to the mobile communication terminal 40 when receiving the master mode, and receives the received data. One mobile communication terminal 40 may check the data to confirm that the currently connected device is the dual mode USB memory device 30.

As described above, the dual-mode universal serial bus memory device of the present invention and a mobile communication terminal supporting the same include a switch for selecting a power source manually applied by a user and a power source selected by the switch operation. Provides a USB memory device including a selected USB port, a standard USB interface for connecting to the PC side, and a dedicated USB interface for a mobile communication terminal using a 4-terminal ear jack of the mobile communication terminal, and can be connected to the USB memory device. The internal USB port is connected to a four-terminal ear jack socket to easily expand the memory of the mobile communication terminal by providing a mobile terminal for supplying power to one of the terminals, and the information of the mobile terminal can be transferred to another mobile terminal. It has the effect of making it easy to share with me.

1 is a conceptual diagram showing the configuration and operation of a general-purpose serial bus (USB) memory device connected to a conventional personal computer.

Figure 2 is an external configuration of an embodiment of the present invention.

3 is a conceptual diagram showing an operation method of an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: Personal computer (PC) 13: PC side USB interface

15: PC side USB port 17: PC side power supply

30: Dual mode USB memory device 31: Selection switch

32: USB interface for PC 33: 4-terminal ear jack USB interface

35: dual mode USB port 37: memory

40: mobile communication terminal 43: 4-terminal ear jack socket USB interface

45: terminal side USB port 47: terminal power

Claims (4)

A standard universal serial bus (USB) interface to connect with a personal computer; A four-terminal ear jack USB interface for a mobile communication terminal having a different power supply path from the standard USB interface; A switch for selecting one of the external power supply paths of the USB interfaces by a user's selection; A dual mode USB port in which one of a master mode and a slave mode is selected by an external power source selected by the switch; And a memory coupled to the dual mode USB port. The dual mode USB port operates in a slave mode when the external power applied through the standard USB interface is selected by the switch, and one of the data terminals is pulled up by the external power supply. Dual-mode universal serial bus memory device. The dual mode USB port of claim 1, wherein the dual mode USB port is powered by a power of a mobile communication terminal applied through a connection when the external power applied through a dedicated 4-terminal ear jack USB interface is selected by the switch. The dual-mode universal serial bus memory device, characterized in that to notify the connection by transmitting a predetermined data to the mobile communication terminal. A USB port operating in a slave mode and recognizing a connection of an external device by an external signal; And a four-terminal ear jack socket USB interface connected to an internal power source, a pair of data signal lines provided from the USB port, and a ground.