Abstract:
An apparatus and method for operating a connector of a mobile terminal are provided. The apparatus includes a connector including a plurality of pins, a plug of a peripheral device, a display unit for displaying a menu for setting a connector mode, an input unit for receiving selection of one connector mode from the menu for setting a connector mode, a main processor for connecting with a switch unit through a data line, a sound line, a microphone line, and a control line, for receiving connector mode selection information from the input unit, and for transferring switching information through the control line, and the switch unit for connecting with a subset of the pins of the connector, and selectively connecting the subset of the pins to at least one of the data line, the sound line, and the microphone line.

Description:
PRIORITY 
     This application claims the benefit under 35 U.S.C. §119(a) of a Korean patent application filed on Dec. 17, 2010 in the Korean Intellectual Property Office and assigned Serial No. 10-2010-0129833, the entire disclosure of which is hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an integration connecting apparatus in a mobile terminal and a method for operating the same. More particularly, the present invention relates to an integration connecting apparatus in a mobile terminal connecting with various types of peripheral devices within a small mounting space, and a method for operating the same. 
     2. Description of the Related Art 
     In recent years, a mobile terminal has become increasingly popular. The mobile terminal may provide a voice call service, various data transmission services and various additional services, and may function as a multimedia communication device. 
     In general, the mobile terminal includes a 20 pin connector or a 24 pin connector for connection with a peripheral device, a first connector (3.5 pi connector) for listening to music or engaging in an earphone call, and a second connector for charging and data communication. 
     However, because the 20 pin connector or the 24 pin connector has a wide area, there is a need for a space for mounting the connector. In a case where a mobile terminal includes a connector for data communication as well as the 3.5 pi connector, there is need for a large space for mounting the connector. 
     SUMMARY OF THE INVENTION 
     Aspects of the present invention are to address at least the above-mentioned problems and/or to provide the advantages described below. Accordingly, an aspect of the present invention is to provide an integration connecting apparatus in a mobile terminal connecting with various types of peripheral devices within a small mounting space. 
     Another aspect of the present invention is to provide a method for operating an integration connecting apparatus in a mobile terminal connecting with various types of peripheral devices within a small mounting space. 
     In accordance with an aspect of the present invention, a mobile terminal is provided. The terminal includes a connector including a plurality of pins, a plug of a peripheral device being insertable into the connector, a display unit for displaying a menu for setting a connector mode; an input unit for receiving selection of one connector mode from the menu for setting a connector mode, a main processor for connecting with a switch unit through a data line, a sound line, a microphone line, and a control line, for receiving connector mode selection information from the input unit, and for transferring switching information corresponding to the selected connector mode to the switch unit through the control line, and the switch unit for connecting with a subset of the pins of the connector, and selectively connecting the subset of the pins to at least one of the data line, the sound line, and the microphone line according to the switching information received from the main processor. 
     In accordance with another aspect of the present invention, a method for operating a connector of a mobile terminal including a connector including a plurality of pins, a plug of a peripheral device being insertable into the connector, and a switch unit selectively connecting a subset of the pins to at least one of a data line, a sound line, and a microphone line, is provided. The method includes receiving selection of a menu for setting a connector mode by a user, displaying a connector mode list including a plurality of connector modes, receiving selection of one connector mode from the connector mode list by the user, and controlling the switch unit to open the subset of pins or to connect the subset of pins to at least one of the data line, the sound line, and the microphone line according the selected connector mode. 
     According to aspects of the present invention, only one connector having a small area is mounted in a mobile terminal, and thus a mounting space of a connector may be reduced. According to aspects of the present invention, a common 3.5 pi connector is used, and thus cost may be reduced. 
     Other aspects, advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features, and advantages of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram illustrating a configuration of a mobile terminal according to an exemplary embodiment of the present invention; 
         FIG. 2  is a view illustrating a connection relationship between an internal construction of a controller and a connector according to an exemplary embodiment of the present invention; 
         FIG. 3  is a flowchart illustrating a method for operating a mobile terminal according to an exemplary embodiment of the present invention; 
         FIGS. 4A and 4B  are views illustrating examples of a screen displayed at a time of setting a connector mode according to an exemplary embodiment of the present invention; 
         FIG. 5  is a flowchart illustrating a method for operating a mobile terminal according to another exemplary embodiment of the present invention; 
         FIGS. 6A to 6E  are views illustrating modified forms of a switch unit based on selection of a connector mode according to an exemplary embodiment of the present invention; and 
         FIG. 7  is a view illustrating a connection relationship between an internal construction of a controller and a connector according to another exemplary embodiment of the present invention. 
     
    
    
     Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     A mobile terminal according to exemplary embodiments of the present invention may be implemented with an information and communication device and a multimedia device, such as a Portable Multimedia Player (PMP), a Personal Digital Assistant (PDA), a Smart Phone, and a Moving Picture Experts Group (MPEG)-1 or MPEG-2 Audio Layer 3 (MP3) player. 
       FIG. 1  is a block diagram illustrating a configuration of a mobile terminal according to an exemplary embodiment of the present invention. The mobile terminal  100  includes a Radio Frequency (RF) communication unit  110 , an audio processing unit  120 , a memory  130 , a connector  140 , an input unit  150 , a display unit  160 , and a controller  170 . According to exemplary embodiments of the present invention, the mobile terminal  100  may include additional and/or different components, or omit any number of the components shown in  FIG. 1 . Similarly, the functionality of two or more components may be integrated into a single component. 
     Referring to  FIG. 1 , the RF communication unit  110  transmits and receives data for radio communication of the mobile terminal  100 . The RF communication unit  110  may include an RF transmitter for up-converting a frequency of a transmit signal and for amplifying the signal, and an RF receiver for low-noise-amplifying a received signal and for down-converting the signal. Further, the RF communication unit  110  receives and outputs data through an RF channel to the controller  170 . The RF communication unit  110  may transmit data output from the controller  170  through the RF channel. The audio processing unit  120  may be implemented with a CODEC. The CODEC may include a data CODEC for processing packet data and an audio CODEC for processing an audio signal such as speech. The audio processing unit  120  converts a digital audio signal into an analog audio signal through the audio CODEC and plays the analog audio signal through a speaker (SPK). The audio processing unit  120  converts an analog audio signal input from a microphone (MIC) into a digital audio signal. 
     The memory  130  stores programs and data used for operations of the mobile terminal  100 . The memory  130  may be divided into a program area and a data area. The program area may store an Operating System (OS) for controlling an overall operation the mobile terminal  100  and for booting the portable terminal  100 , and application programs used for playing multimedia contents or performing other functions of the mobile terminal  100 , for example, a camera function, a sound playing function, and an image or moving image playing function. The data area may store data created according to a use of the mobile terminal  100 , for example, images, moving images, phone-books, or audio data. The memory  130  may store programs and data regarding a menu for setting a connector mode. 
     A plug of a peripheral device is inserted into a connector  140 . The connector  140  provides paths for Universal Serial Bus (USB) communication and Universal Asynchronous Receiver/Transmitter (UART) communication of the peripheral device, an earphone function, an ear microphone function, a power charging function, and an antenna function. It is preferred that the connector  140  is a 3.5 pi 4-pole connector. However, the present invention is not limited thereto. The connector  140  may be a circular connector having a diameter (e.g., 2.5 mm) different from 3.5 pi. Exemplary embodiments of the present invention are described based on a 4-pole connector. However, the present invention is not limited thereto. The present invention is also applicable to a 3-pole connector, a 5-pole connector, etc. A first pin of the connector  140  may be used to sense insertion of a plug of the peripheral device and provide a charge power. A second pin and a third pin may be used for a data communication function, an earphone function, and a microphone function. A fourth pin may be used for a ground (GND) and an antenna function. The first pin is fixedly connected to a power supply and the fourth pin is fixedly connected to the ground. 
     The input unit  150  receives and transfers a key operation signal of a user for controlling the mobile terminal  100  to the controller  170 . The input unit  150  may be implemented with a keypad such as a 3*4 keypad or a QWERTY keypad including a numeral key, a character key, and an arrow key or a touch panel. Besides these, the input unit  150  may be implemented with a button key, a jog key, and a wheel key. The input unit  150  generates and transfers an input signal for executing applications (e.g., a call function, a music playing function, a moving image playing function, an image display function, a camera photographing function, a Digital Multimedia Broadcasting (DMB) output function) of the mobile terminal  100  to the controller  170 . 
     The display unit  160  may be implemented with a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED), an Active Matrix Organic Light Emitting Diode (AMOLED), etc. The display unit  160  visibly provides a menu of the mobile terminal  100 , input data, function setting information, and various other information. The display unit  160  outputs a booting screen, an idle screen, a menu screen, a call screen, and other application screens of the mobile terminal  100 . 
     The controller  170  controls an overall operation with respect to respective structural elements of the mobile terminal  100 . A construction of the controller  170  of the present invention will be described below with reference to  FIG. 2 . 
       FIG. 2  is a view illustrating a connection relationship between an internal construction of a controller and a connector according to an exemplary embodiment of the present invention. 
     The controller  170  according to an exemplary embodiment of the present invention includes a main processor  171 , a switch unit  172 , and a power supply  173 . According to exemplary embodiments of the present invention, the controller  170  may include additional and/or different components, or omit any number of the components shown in  FIG. 2 . Similarly, the functionality of two or more components may be integrated into a single component. 
     The main processor  171  controls an overall operation of the mobile terminal  100 . The main processor  171  controls the switch unit  172  according to a signal received from the input unit  150 . The main processor  171  connects with the switch unit  172  through a UART (TXD) line  181 , a UART(RXD) line  182 , a USB(D+) line  183 , a USB(D−) line  184 , an EAR(L) line  185 , an EAR(R) line  186 , an MIC line  187 , and a CMD line  188 . The UART(TXD)  181  is a transmission line of a UART communication, the UART(RXD) line  182  is a receiving line of the UART communication, the USB(D+) line  183  is a data (+) line of a USB communication, the USB(D−) line  184  is a data(−) line of the USB communication, the EAR(L) line  185  is a left sound line of an earphone function, the EAR(R) line  186  is a right sound line of the earphone function, the MIC line  187  is a line of a microphone function, and the CMD line  188  is a line for communicating a control signal for controlling the switch unit  172 . 
     The switch unit  172  connects with the main processor  171  through the UART(TXD) line  181 , the UART(RXD) line  182 , the USB(D+)  183 , the USB(D−) line  184 , the EAR(L) line  185 , the EAR(R) line  186 , the MIC line  187 , and the CMD line  188 . The switch unit  172  moves a switch according to a control signal received from the CMD line  188 . The switch unit  172  connects with a second pin of the connector  140  through the second pin line  142 . The switch unit  172  connects with a third pin of the connector  140  through the third pin line  143 . A first switch  1721  and a second switch  1722  are located at an end of the second pin line  142  and an end of the third pin line in the switch unit  172 , respectively. 
     The switch unit  172  moves the first switch  1721  and the second switch  1722  with the first switch  1721  and the second switch  1722  so as to be in contact with the UART(TXD) line  181 , the UART(RXD) line  182 , the USB(D+) line  183 , the USB(D−) line  184 , the EAR(L) line  185 , the EAR(R) line  186 , or the MIC line  187  or without contacting any of the lines to open the first switch  1721  and the second switch  1722 . 
     The power supply  173  generates a voltage for driving the mobile terminal  100 , and connects with the main processor  171 , the switch unit  172 , and a first pin of the connector  140 . The power supply  173  connects with the first pin of the connector  140  through the first pin line  141 . 
     The connector  140  shown in  FIG. 2  is a 4-pole connector. A first pin, a second pin, a third pin, and a fourth pin are formed from the left side to the right side. The first pin  141  connects with the power supply  173  through the first pin line  141 . The second pin and the third pin connect with the switch unit  172  through the second pin line  142  and the third pin line  143 , respectively. The fourth pin connects with a ground (GND)  144 . 
     The main processor  171  determines whether a menu for setting a connector mode is selected though the input unit  150 . If the menu for setting a connector mode is selected, the main processor  171  controls the display unit  160  to display a connector mode list composed of a charging mode, a USB mode, a UART mode, an antenna mode, an earphone mode, and an ear mode. If it is recognized that one connector mode is selected from the input unit  150 , the main processor  171  controls the switch unit  172  according to the selected connector mode. If the charging mode or the antenna mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to open a second pin and a third pin of the connector  140 . That is, the switch unit  172  controls the first switch  1721  and the second switch  1722  to not be in contact with any of lines  181  to  187 . If the USB mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to the USB(D+) line  183  and connect the second switch  1722  to the USB(D−) LINE  184 . Meanwhile, if the UART mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to the UART(TXD) line  181  and connect the second switch  1722  to the UART(RXD) line  182 . 
     If the earphone mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to the EAR(L) line  185  and to connect the second switch  1722  to the EAL(R) line  186 . If the ear microphone mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  with the EAR(R) line  186  and to connect the second switch  1722  to the MIC line  187 . 
     In an exemplary embodiment of the present invention, the main processor  171  determines whether the mobile terminal  100  is in a power on state. If the mobile terminal  100  is in the power on state, the main processor  171  sets a connector mode to an earphone mode and controls the switch unit  172  to connect the first switch  1721  to an EAR(L) line  185  and to connect the second switch  1722  to an EAR(R) line  186 . If the mobile terminal  100  is in a power off state, the main processor  171  may set the connected mode to a charging mode and control the switch unit  172  to open the first switch  1721  and the second switch  1722 . Further, the main processor  171  determines whether a radio function is executed through an input unit  150 . If the radio function is executed, the main processor  171  may set the connector mode to an antenna mode and control the switch unit  172  to open the first switch  1721  and the second switch  1722 . 
     The foregoing exemplary embodiment has illustrated an internal configuration of the mobile terminal  100  according to an exemplary embodiment of the present invention. Hereinafter, a method for operating the mobile terminal  100  is described. 
       FIG. 3  is a flowchart illustrating a method for operating a mobile terminal according to an exemplary embodiment of the present invention. 
     A main processor  171  determines whether a menu for setting a connector mode is selected through an input unit  150  in step  301 . If the main processor  171  recognizes selection input of a main menu of a user through an input unit  150 , the main processor  171  may control the display unit  160  to display a main menu list. In this case, a ‘connector mode set’ menu may be included in the main menu list. 
       FIGS. 4A and 4B  are views illustrating examples of a screen displayed at a time of setting a connector mode according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 4A , a main menu list including the ‘connector mode set’ menu is shown. 
     If the menu for setting a connector mode is selected through the input unit  150 , the main processor  171  controls the display unit  160  to display a connector mode list in step  302 . The connector mode list of an exemplary embodiment of the present invention may include a charging mode, a USB mode, a UART mode, an antenna (ANT) mode, an earphone mode, and ear-microphone (MIC) mode. In an exemplary embodiment of the present invention, the antenna mode may be divided into a general antenna mode and an earphone combined mode. 
     Referring to  FIG. 4B , an example of a screen of a connector mode list is shown. The connector mode list is composed of a charging mode, a USB mode, a UART mode, an antenna mode, an earphone mode, and an ear-microphone mode. 
     The main processor  171  recognizes that any one connector mode is selected through the input unit  150  in step  303 . A user selects any one connector mode using the input unit  150  while viewing the connector mode list, and the main processor  171  recognizes a connector mode selected by the user based on a signal received from the input unit  150 . 
     Next, the main processor  171  controls the switch unit  172  according to the selected connector mode in step  304 . The main processor  171  transmits a control signal to the switch unit  172  through a CMD line  172 , and the switch unit  172  moves the control signal received from the main processor  171  to the first switch  1721  and the second switch  1722 . If it is recognized that a charging mode or an antenna mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to open a second pin and a third pin of the connector  140 . Because only a power pin (first pin) and a ground pin (fourth pin) are used in a charging mode, the switch unit  172  changes the second pin and the third pin regarding data communication and speech communication to an open state. An antenna mode is a mode using an earphone cable as an antenna, and may be divided into a general antenna mode and an antenna/earphone mode. Because only a power pin (first pin) and a ground pin (fourth pin) are used in the general antenna mode, the switch unit  172  changes the second pin and the third pin to the open state. However, the switch unit may connect the first switch  1721  to an EAR(L) line  185  for speech communication in an antenna/earphone mode using both of the antenna mode and the earphone mode, and connect the second switch  1722  to an EAR(R) line  186 . 
       FIGS. 6A to 6E  are views illustrating modified forms of a switch unit based on selection of a connector mode according to an exemplary embodiment of the present invention. 
     Referring to  FIG. 6A , a form of the switch unit  172  when a charging mode or an antenna mode is selected as the connector mode is shown. In  FIG. 6A , a first switch  1721  and a second switch  1722  do not contact with lines  181  to  187  and are thus open. 
     If it is recognized that a USB mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to a USB(D+) line  183 , and connect the second switch  1722  to a USB(D−) line  184 . If it is recognized that a UART mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to UART(TXD) line  181  and connect the second switch  1722  to a UART(RXD) line  182 . A USB mode and a UART mode are a data communication mode, and a connector  140  becomes a path for communicating data. A second pin and a third pin are connected to a USB(D+) line  183  and a USB(D−) line  184  or a UART(TXD) line  181  and a UART(RXD) line  182 , respectively, to function as a path for communicating data. 
     Referring to  FIG. 6B , a form of the switch unit  172  when a UART mode is selected as the connector mode is shown. In  FIG. 6B , a first switch  1721  and a second switch  1722  connect with a UART(TXD) line  181  and a UART(RXD) line  182 , respectively. 
     Referring to  FIG. 6C , a form of the switch unit  172  when a USB mode is selected as the connector mode is shown. In  FIG. 6C , a first switch  1721  and a second switch  1722  connect with a USB(D+) line  183  and a USB(D−) line  184 , respectively. 
     If it is recognized that an earphone mode is selected as a connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to an EAR(L) line  185  and to connect the second switch  1722  to an EAR(R) line  186 . The earphone mode is a speech communication mode, and the connector  140  becomes a path for speech output from the main processor  171 . A second pin and a third pin are connected with an EAR(L) line  185  and an EAR(R) line  186  to function as a path for speech, respectively. 
     If it is recognized that an ear microphone mode is selected as the connector mode, the main processor  171  controls the switch unit  172  to connect the first switch  1721  to an EAR(R) line  186  and to connect the second switch  1722  to an MIC line  187 . The ear microphone mode is also a speech communication mode, and the connector  140  becomes a path for speech input to a microphone of an ear-jack and a speech output from the main processor  171 . A second pin and a third pin are connected with an EAR(L) line  185  and an EAR(R) line  186  to function as a path for speech, respectively. In an exemplary embodiment of the present invention, the second pin and the third pin may be connected to the EAR(L) line  185  and the MIC line  187 , respectively. 
     Referring to  FIG. 6D , a form of the switch unit  172  when an earphone mode is selected as the connector mode is shown. In  FIG. 6D , a first switch  1721  and a second switch  1722  are connected to an EAR(L)  185  and an EAR(R) line  186 , respectively. 
     Referring to  FIG. 6E , a form of the switch unit  172  when an ear microphone mode is selected as the connector mode is shown. In  FIG. 6E , a first switch  1721  and a second switch  1722  are connected to an EAR(R)  186  and a MIC line  187 , respectively. 
     In an exemplary embodiment of the present invention, if a user selects a connector mode, a line connected to the second pin and the third pin of the connector  140  changes according to selected information of a user such that the connector  140  may selectively use one of a data communication function, a speech communication function, a charging function, or an antenna function. 
       FIG. 5  is a flowchart illustrating a method for operating a mobile terminal according to another exemplary embodiment of the present invention. 
     The main processor  171  determines whether the mobile terminal  100  is in a power on state in step  501 . If the mobile terminal  100  is not in the power on state, the main processor  171  proceeds to step  510 , which is described further below. In contrast, if the mobile terminal  100  is in the power on state, the main processor  171  sets a connector mode to an earphone mode in step  502 . The main processor  171  controls a switch unit  172  to connect a first switch  1721  to an EAR(L) line  185  and to connect a second switch  1722  to an EAR(R) line  186 . 
     The main processor  171  determines whether a radio function execution command is input in step  503 . In this case, a user inputs a radio application execution command through an input unit  150 , and a main processor  171  may determine whether a radio function execution command is input based on a signal received from the input signal. 
     When the radio function execution command is input, the main processor  171  executes a radio function to set the connector mode to an antenna mode in step  504 . The main processor  171  controls a switch unit  1721  to open the first switch  1721  and the second switch  1722 . Thereafter, the main processor  171  ends the process according to an exemplary embodiment of the present invention. 
     If the radio function execution command is not input at step  503 , the main processor  171  determines whether a USB mode selection command is input by a user through the input unit  150  in step  505 . A user may select a menu for setting a connector mode and select a USB mode in a connector mode list. When the USB mode selection command is input, the main processor  171  sets a connector mode to a USB mode in step  506 . The main processor  171  controls the switch unit  172  to connect a first switch  1721  to a USB(D+) line  183  and to connect a second switch  1722  to a USB(D−) line  184 . Thereafter, the main processor  171  ends the process according to an exemplary embodiment of the present invention. 
     If the USB mode selection command is not input by a user at step  505 , the main processor  171  determines whether a UART mode selection command is input by a user in step  507 . A user may select a menu for setting a connector and select a UART mode from a connector mode list. When the UART mode selection command is input, the main processor  171  sets the connector mode to a UART mode in step  508 . The main processor  171  controls the switch unit  172  to connect the first switch  1721  to a UART(TXD) line  181  and to connect the second switch  1722  to a UART(RXD) line  182 . Thereafter, the main processor  171  ends the process according to an exemplary embodiment of the present invention. 
     If the UART mode selection command is not input by a user at step  507 , the main processor  171  determines whether a charging mode selection command is input by a user in step  509 . A user may select a menu for setting a connector mode and select a charging mode from a connector mode list. When the charging mode selection command is input, the main processor  171  sets the connector mode to a charging mode in step  510 . The main processor  171  controls the switch unit  172  to open the first switch  1721  and the second switch  1722 . Thereafter, the main processor  171  ends the process according to an exemplary embodiment of the present invention. 
     When the charging mode selection command is not input by a user at step  509 , the main processor  171  determines whether a radio function execution command occurs in step  503  and performs the foregoing procedures. 
     If the mobile terminal  100  is in a power off state at step  501 , the main processor  171  sets the connector mode to a charging mode, and controls the switch unit  172  to open the first switch  1721  and the second switch  1722 . 
       FIG. 7  is a view illustrating a connection relationship between an internal construction of a controller and a connector according to another exemplary embodiment of the present invention. In  FIG. 7 , the controller  170  includes two switch units. 
     The controller  170  according to another exemplary embodiment of the present invention includes a main processor  171 , a first switch unit  172   a , a second switch unit  172   b , and a power supply  173 . According to exemplary embodiments of the present invention, the controller  170  may include additional and/or different components, or omit any number of the components shown in  FIG. 7 . Similarly, the functionality of two or more components may be integrated into a single component. 
     The main processor  171  connects with the first switch unit  172   a  through a UART(TXD) line  181 , a USB(D+) line  183 , an EAR(L) line  185 , an MIC line  187 , and a CMD  1  line  188   a . The main processor  171  connects with the second switch unit  172   b  through a UART(RXD) line  182 , a USB(D−) line  184 , an EAR(R) line  186 , and a CMD  2  line  188   b.    
     The CMD  1  line  188   a  is a line for communicating a control signal for controlling the first switch unit  172   a . The CMD  2  line  188   b  is a line for communicating a control signal for controlling the second switch unit  172   b.    
     The first switch unit  172   a  connects with a second pin of the connector  140  through a second pin line  142 , and the second switch unit  172   b  connects with a third pin of the connector  140  through a third pin line  143 . A first switch  1721  is located at an end of a second pin line  142  in the first switch unit  172   a . A second switch  1722  is located at an end of a third pin line  143  in the second switch unit  172   b . The first switch unit  172   a  may move the first switch  1721  so as to be in contact with one of the UART(TXD) line  181 , the USB(D+) line  183 , the EAR(L) line  185 , or the MIC line  187  or to open the first switch  1721 . Further, the second switch unit  172   b  may moves the second switch  1722  so as to be in contact with one of the UART(RXD) line  182 , the USB(D−) line  184 , or the EAR(R) line  186  or to open the second switch  1722 . 
     The power supply  173  connects with the main processor  171 , the first switch unit  172   a , the second switch unit  172   b , and a first pin of the connector  140 , and supplies power to them. A fourth pin may be used for a ground (GND)  144  and may be used for an antenna function. 
     While the invention has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.