Abstract:
Disclosed are a universal serial bus (USB) memory device having a 5 pin USB connector which may be directly used for a portable terminal and a method of manufacturing the same. The USB memory device includes: at least one 5 pin USB connector; a memory to write data received from the 5 pin USB connector or reading out stored data to transmit the data to the 5 pin USB connector; and a controller electrically connected to the 5 pin USB connector and the memory to control data transmission between the 5 pin USB connector and the memory, wherein the 5 pin USB connector comprises a power terminal, a ground terminal, a D+ terminal, a D− terminal, and an ID terminal, and the ID terminal is connected to the ground terminal so that the 5 pin USB connector is grounded.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a universal serial bus (hereinafter referred to as ‘USB’) memory device having a 5 pin USB connector. More particularly, the present invention relates an USB memory device which may be directly used in various types of 5 pin US port portable (mobile) terminals including a smart phone and a smart pad and a method of manufacturing the same. 
     The present invention also relates to an USB memory device which includes a 5 pin USB connector provided at one side thereof and a 4 pin USB connector provided at the other side thereof such that the USB memory device can be connected to a PC type 4 pin USB port, such as a desk top computer, as well as various types of portable terminals to facilitate memory storage and data transmission between terminals of different pin types, and a method of manufacturing the same. 
     2. Description of the Related Art 
     A USB refers to one of bus standards used for data communication between a computer and a peripheral device. A USB memory device is a portable storage device using a flash memory inserted into a USB port, and acquires data from various electronic devices, such as a PC supporting a USB protocol, so that a user may reuse the data. 
     However, since a USB memory device according to the related art includes a 4 pin USB connector, the USB memory device is not suitable for a mobile terminal using a 5 pin USB port, such as a mini type port or a micro type port. 
     In order to solve this problem, as shown in  FIG. 1 , a USB host cable  10  according to the related art has been developed in which a 4 pin USB is provided at one end of the USB host cable  10  and a 5 pin USB connector is provided at an opposite end of USB host cable  10  so that a USB memory device can be connected to a mobile terminal. 
     However, the related art has a limitation in that a separate cable is required to connect the USB memory device to the portable terminal. 
     Accordingly, the development of a USB memory device which can be directly used in a portable terminal is needed. 
     Since the USB memory device according to the related art is not suitable for the portable terminal, although data transfer can be freely achieved between PCs using only the USB memory device, there is a limitation in data transfer between the PC and the portable terminal using only the USB memory device. To transfer data between the PC and the portable terminal, there is needed a cable provided at one side thereof with a 4 pin USC connector and at the other side thereof with a 5 pin USB connector. 
     Accordingly, the development of a USB memory device available in both of the PC and the portable terminal is required. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a USB memory device having a 5 pin USB connector which may be directly used for a portable terminal. 
     Another object of the present invention is to provide a USB memory device having both a 5 pin USB connector and a 4 pin USB connector, which is applicable to both of a PC and a portable terminal to freely transfer data between the PC and the portable terminal. 
     To accomplish these objects, according to one aspect of the present invention, there is provided a universal serial bus (USB) memory device including: at least one 5 pin USB connector; a memory to write data received from the 5 pin USB connector or reading out stored data to transmit the data to the 5 pin USB connector; and a controller electrically connected to the 5 pin USB connector and the memory to control data transmission between the 5 pin USB connector and the memory, wherein the 5 pin USB connector comprises a power terminal, a ground terminal, a D+ terminal, a D− terminal, and an ID terminal, and the ID terminal is connected to the ground terminal so that the 5 pin USB connector is grounded. 
     The power terminal of the 5 pin USB connector may be electrically connected to a power control terminal of the controller, the D+ terminal of the 5 pin USB connector may be electrically connected to a D− control terminal of the controller, the D− terminal of the 5 pin USB connector may be electrically connected to a D+ control terminal of the controller, and the ground terminal and the ID terminal of the 5 pin USB connector may be electrically connected to a ground control terminal of the controller, respectively. 
     The universal serial bus memory device may further include at least one 4 pin USB connector including a second power terminal, a second ground terminal, a second D+ terminal, and a second D− terminal, wherein the 4 pin USB connector is electrically connected to the controller so that data transmission from the memory is controlled by the controller. 
     The 4 pin USB connector may be electrically connected to an electrical connection node between the 5 pin USB connector and the controller  120 . 
     According to another aspect of the present invention, there is provided a method of manufacturing a universal serial bus (USB) memory device, the method including: forming a 5 pin USB connector including a power terminal transferring V CC  power, a ground terminal transferring a ground signal, a D+ terminal and a D− terminal transferring a data signal, and an ID terminal selectively transferring a client signal and a host signal to an external device, and transferring a signal in such a manner that an external device connected to the 5 pin USB connector is recognized as a client when the ID terminal is connected to the ground terminal so that the 5 pin USB connector is open without being connected to a mobile terminal, and transferring a signal in such a manner that the external device connected to the 5 pin USB connector is recognized as a host when the 5 pin USB connector is shorted with the mobile terminal; forming a controller configured to manage data input/output of the memory while controlling an operating system of the portable terminal connected to the 5 pin USB connector to recognize a USB memory device, and electrically connected to the 5 pin USB connector and the memory to controls data transmission between the 5 pin USB connector and the memory; forming a memory configured to write data from the 5 pin USB connector or read out stored data to transmit the data to the 5 pin USB connector, freely store or delete data, and maintain the data even if power is turned off. 
     The 5 pin USB may be electrically connected to the controller in such a manner that the power terminal of the 5 pin USB connector is electrically connected to a power control terminal of the controller, the D+ terminal of the pin USB connector is electrically connected to a D− control terminal of the controller, the D− terminal of the pin USB connector is electrically connected to a D+ control terminal of the controller, and the ground terminal and the ID terminal of the 5 pin USB connector are electrically connected to a ground control terminal of the controller, respectively. 
     The method may further include forming a 4 pin USB connector including a second power terminal, a second ground terminal, a second D+ terminal, and a second D− terminal, and wherein the 4 pin USB connector may be electrically connected to the controller so that data transmission from the memory is controlled by the controller. 
     The controller may control data transmission between the 4 pin USB connector and the memory or controls the memory to record and store data from the 4 pin USB connector, the power terminal of the 4 pin USB connector may be electrically connected to a connection node between the power terminal of the 5 pin USB connector and the power control terminal of the controller, the D+ terminal of the pin USB connector may be electrically connected to a connection node between the D+ terminal of the 5 pin USB connector and the D− control terminal of the controller, the D− terminal of the 4 pin USB connector may be electrically connected to a connection node between the D− terminal of the 5 pin USB connector and the D− control terminal of the controller, and the ground terminal of the 4 pin USB connector may be electrically connected to a connection node between the ground terminal of the 5 pin USB connector and the ground control terminal of the controller. 
     As described above, since the USB memory device according to the present invention may be directly connected to the mobile terminal, the USB memory device can receive and store data from the mobile terminal without a separate cable or auxiliary device. 
     That is, since the USB memory device of the present invention may be directly connected to the separate cable or auxiliary device, only the USB memory device can store data of the mobile terminal and transfer the data of the mobile terminal to other mobile terminals. 
     In addition, the USB memory device may include not only the first USB connector suitable for the mobile terminal, but also the second USB connector suitable for the PC, data transfer between the PC and the mobile terminal can be achieved only using the USB memory device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating a configuration of a USB host cable according to the related art; 
         FIG. 2  is a view illustrating constituent elements of a USB memory device and connection relationship of the constituent elements according to an embodiment of the present invention; and 
         FIG. 3  is a view illustrating constituent elements of a USB memory device and connection relationship of the constituent elements according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to accompanying drawings. However, the present inventive concept may be embodied in many different forms and should not be limited to the embodiments set forth herein. 
     Accordingly, the present invention is not limited to the specific embodiment, but the embodiment includes all modifications, equivalents, and substitutes belonging to the technical scope of the embodiment without departing from the spirit of the embodiment. 
     The same reference numbers are used throughout the drawings to refer to the same or like parts. 
       FIG. 2  is a view illustrating constituent elements of a USB memory device and connection relationship between the constituent elements according to an embodiment of the present invention. 
     As shown in  FIG. 2 , the USB memory device  100  of the present invention is provided with at least one 5 pin USB connector  110 , and a memory  130  and a controller  120  are electrically communicated with the 5 pin USB connector  110 . 
     In detail, the 5 pin USB connector  110  is connected to a USB port of a mobile terminal having a 5 pin USB port to input/output data. The mobile terminal having the 5 pin USB port includes a controller controlling and managing USB transmission on a bus by an operation program supporting a USB standard protocol and being set in a host mode or a client mode, and the 5 pin UBS port for connecting a peripheral device of a USB standard. 
     For reference, the USB port of the mobile terminal corresponds to the USB connector of the USB memory. If the USB connector is a male connector, the USB port may be a female connector. 
     The 5 pin USB connector  110  includes a power terminal a, a D− terminal b, a D+ terminal c, an identification (ID) terminal d, and a ground terminal e, and functions of the power terminal a, the D− terminal b, the D+ terminal c, the ID terminal d, and the ground terminal e will be described in a following table 1. The ID terminal d is connected and shorted with the ground terminal e so that a controller of the mobile terminal is activated by a host controller. 
     This is because a signal is transferred so that an external device connected to the USB connector is recognized as a client when the ID terminal d is open without being connected to the ground terminal e, and the signal is transferred so that the external device connected to the USB connector is recognized as a host when the ID terminal d is shorted. 
     
       
         
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Terminal name 
                 Function 
               
               
                   
               
             
             
               
                 Power terminal 
                 Transfer V cc  power 
               
               
                 D− terminal 
                 Transfer data signal 
               
               
                 D+ terminal 
                 Transfer data signal 
               
               
                 ID terminal 
                 Transfer client/host signals to external 
               
               
                   
                 device 
               
               
                 Ground terminal 
                 Transfer ground signal 
               
               
                   
               
             
          
         
       
     
     Meanwhile, the memory  130  writes and reads data. In detail, the memory  130  writes data received from the 5 pin USB connector or reads out stored data and transfers the read data to the 5 pin USB connector. 
     It is preferable that the memory  130  may freely store or remove data, and maintain the data even at power-off. For example, the memory  130  may include a flash memory. 
     Meanwhile, the controller  120  controls an operating system of the portable terminal connected to the 5 pin USB connector  110  to recognize a USB memory device, and manages data input/output of the memory  130 . In detail, the controller  120  is electrically connected to the 5 pin USB connector  110  and the memory  130  and controls data transmission between the 5 pin USB connector  110  and the memory  130 . 
     Referring to  FIG. 2 , the 5 pin USB connector  110  is electrically connected to the controller  120 . 
     In this case, the power terminal a of the 5 pin USB connector  110  is electrically connected to a power control terminal  1  of the controller  120 , the D− terminal b of the 5 pin USB connector  110  is electrically connected to a D+ control terminal  3  of the controller  120 , a D+ terminal of the 5 pin USB connector  110  is electrically connected to a D− control terminal  2  of the controller  120 , and the ID terminal d and the ground terminal e of the 5 pin USB connector are electrically connected to a ground control terminal  4  of the controller  120 , respectively. 
     Particularly, the D+ terminal c and the D− terminal b of the 5 pin USB connector  110  are electrically connected to the D− control terminal  2  and the D+ control terminal  3  of the controller  120 , respectively, and transmit data from the USB connector  110  to the controller  120 . 
     Accordingly, the control of data transmission by the controller  120  will be described in detail. The D− control terminal  2  and the D+ control terminal  3  of the controller  120  are electrically connected to the D+ terminal c and the D− terminal b of the 5 pin USB connector  110 , respectively. 
     In this case, the controller  120  may receive data from the 5 pin USB connector  110 , and transmits the received data to the memory  130  to control so that the data are recorded in the memory  130 . To the contrary, the controller  120  may reads out data stored in the memory  130  to control so that the data are transmitted to the 5 pin USB connector  110 . 
     Since the USB memory device  100  according to the embodiment of the present invention mentioned above is suitably used for the mobile terminal having the 5 pin USB port and may be directly connected to the mobile terminal, the USB memory device may receive and store the data from the mobile terminal without a separate cable or auxiliary device. 
     Further, the USB memory device  100  according to the embodiment of the present invention may store data of the mobile terminal and transfer the data to other mobile terminals using only the USB memory device without the separate cable or auxiliary device. 
       FIG. 3  is a view illustrating constituent elements of a USB memory device and connection relationship between the constituent elements according to another embodiment of the present invention. 
     Referring to  FIG. 3 , the USB memory device according to another embodiment of the present invention may further include at least one 4 pin USB connector  140  having a second power terminal  10 , a second D+ terminal  20 , a second D− terminal  30 , and a second ground terminal  400  in addition to the configuration of the USB memory device according to the embodiment of the present invention. 
     That is, the USB memory device  100  may be used not only for a mobile terminal having a 5 pin USB port, but also for a PC by further including the 4 pin USB connector  140  suitable for a PC. 
     The 4 pin USB connector  140  is electrically connected to the controller  120  so that data transmission is controlled between the 4 pin USB connector  140  and the memory  130  by the controller  120 . 
     Thus, the controller  120  can control data transmission between the 5 pin USB connector  110  and the memory  130  and data transmission between the 4 pin USB connector  140  and the memory  130 , and the memory  130  can record data from the 4 pin USB connector  140  and can transmit stored data to the 4 pin USB connector  140 . 
     Referring to  FIG. 3 , an electrical connection configuration between the 4 pin USB connector  140  and the controller  120  will be described in detail below. The 4 pin USB connector  140  may be electrically connected to an electrical connection node between the 5 pin USB connector  110  and the controller  120 . 
     In detail, a second power terminal  10  of the 4 pin USB connector is electrically connected to a connection node between the power terminal a of the 5 pin USB connector  110  and the power control terminal  1  of the controller  120 . The second D+ terminal  20  of the 4 pin USB connector  140  is electrically connected to a connection node between the D+ terminal c of the 5 pin USB connector  110  and the D− control terminal  2  of the controller  120 . The second D− terminal  30  of the 4 pin USB connector  140  is electrically connected to a connection node between the D− terminal b of the 5 pin USB connector  110  and the D− control terminal  3  of the controller  120 . The second ground terminal  40  of the pin USB connector  140  is electrically connected to a connection node between the ground terminal e of the 5 pin USB connector  110  and the ground control terminal  4  of the controller  120 . 
     As described above, since the USB memory device  100  according to another embodiment of the present invention includes the 4 pin USB connector  140  as well as the 5 pin USB connector  110 , the USB memory device  100  is suitably used to the PC as well as the mobile terminal having the 5 pin USB port. 
     Therefore, the USB memory device  100  according another embodiment of the present invention may be used as a mobile disk in the PC as well as the mobile terminal, and the user may store the data from the mobile terminal and transfer the stored data to the PC. 
     Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.