KR100796158B1 - Mobile communication terminal for intergration connecting of external device - Google Patents

Abstract

A mobile communication terminal capable of conducting unified connection of an external device is provided to unify plural connector functions so that the functions can be performed by only using one universal earjack, so as to reduce connectors necessary for connection with an external device, thereby decreasing deficiency problems of a PCB(Printed Circuit Board) space. A universal earjack is contacted with a plug of a particular cable among plural cables for connecting a mobile communication terminal with each external device. If the plug of the particular cable is connected to a particular terminal of the earjack, a controller(300) generates/outputs a switching control signal which instructs a type of the particular cable corresponding to a measured reference voltage, based on cable information capable of distinguishing types of cables in accordance with plural reference voltage values and the reference voltage measured by voltage distribution of a resistance value R2. A switching unit(400) performs a signal transmission function between the terminal and an external device corresponding to the type of the particular cable by responding to the switching control signal.

Description

MOBILE COMMUNICATION TERMINAL FOR INTERGRATION CONNECTING OF EXTERNAL DEVICE}

1 is an internal block diagram of a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention.

2 is a diagram illustrating a process of checking a cable type in a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention.

3 is an equivalent circuit illustrating a process of measuring a reference voltage according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: cable 110: plug

200: universal ear jack 300: control unit

400: switching unit

The present invention relates to a mobile communication terminal, and more particularly, to a mobile communication terminal capable of integrated connection of an external device for integrating various connector functions required for connection with an external device.

In general, a mobile communication terminal is provided with an ear jack for connecting a microphone to conduct a voice call, and a 24-pin I / O connector for carrying data for input / output. ).

The 24-pin I / O connector is used to transfer information from an external device to a terminal or terminal to an external device. It is an I / O connector for mobile phone terminal with 24 pins applied.

The 24-pin I / O connector provides an interface to various external devices such as CHARGER, ADAPTOR, HANDFREE, DATA CABLE, PAD, etc. It is possible.

As these mobile communication terminals become more advanced, many chips need to be embedded in a certain PCB space, thereby securing a PCB area. However, since a 24 pin I / O connector and an ear microphone jack are respectively provided, there is a problem that the space of the PCB may be insufficient and the appearance is not good due to unnecessary connectors.

In order to overcome this problem, a mobile communication terminal having a prior art DC jack and ear jack integrator disclosed in Korean Laid-Open Patent Publication No. 2006-0010615 has a DC for connecting an ear jack and a battery charging adapter to connect an ear microphone. A jack combined part provided with a jack, an ear microphone detecting part for detecting an ear microphone inputted by an ear microphone jack of a jack combined part, and a selective output of an audio signal input by an external control signal to an internal speaker or an ear microphone jack. An audio output selection unit, an audio input input unit for selectively outputting an audio signal input to the ear microphone terminal by an external control signal, or an audio signal input to the internal microphone; In the charge switch unit for outputting a predetermined voltage to the battery, and the ear microphone detector And a controller for outputting a predetermined control signal to the voice output selector and the voice input selector according to the detected ear microphone.

The mobile terminal equipped with the DC jack and the ear jack integration device integrates a battery charging adapter and an ear microphone jack, and connectors for USB and UART communication with external devices are not integrated.

Therefore, the above-mentioned mobile communication terminal is not overcoming the design problem due to the connectors that are still present more than necessary, and there are limitations in reducing the size and thickness of the mobile communication terminal since several connectors occupy a predetermined space of the PCB. There is this.

Accordingly, an object of the present invention is to provide a mobile communication terminal capable of integrated connection of an external device for integrating various connector functions required for connection of an external device and a mobile communication terminal into one.

In order to achieve the first object of the present invention described above, a mobile communication terminal capable of integrated connection of an external device according to an aspect of the present invention includes a respective external device and a mobile communication terminal for an ear microphone function or various data input / output functions. A universal ear jack to which a plug of a specific cable is contacted among a plurality of cables to be connected, and when a plug of the specific cable is connected to a specific terminal of the universal ear jack, a reference voltage is measured based on a resistance value corresponding to the specific cable. A controller configured to generate and output a switching control signal indicating the specific cable type based on the reference voltage, and transmit a signal between the external device corresponding to the specific cable type and the mobile communication terminal in response to the switching control signal. It includes a switching unit for performing a function.

The plurality of cables for connecting each of the external devices and the mobile communication terminal may include at least one of a sound earphone cable, a USB data cable, a universal asynchronous receiver / transmitter (UART) control cable, and a charging cable.

The universal ear jack is a 5-pole ear jack, and among the 5-pole terminals of the universal ear jack, the first pin for cable sensing and the fifth pin for ground are commonly used as cables, and the second, third, and third Four pins can be distinguished by function for each cable.

The controller may predefine a cable pin map for a 5-pole terminal of the universal ear jack, which is divided by function for each cable.

The cable pin map is, in the case of the sound earphone cable, a first pin-cable detection, a second pin / third pin-right / left sound (RIGHT / LEFT SOUND), a fourth pin-mic (MIC). Fifth pin-ground, in the case of the USB data cable, first pin-cable detection, second pin / third pin-data (+,-), fourth pin-power signal (VBUS), fifth pin Ground; in the case of the UART control cable, a first pin-cable detection, a second pin-transmit signal, a third pin-receive signal, a fourth pin-DTR (Data Terminal Ready), a fifth pin-ground; In the case of the charging cable, the first pin-cable detection, the second pin / third pin-power supply, the fourth pin-battery ID (ID), and the fifth pin-ground.

In the case of the UART control cable, the fourth pin can be used only when it is necessary to check whether the data terminal is OK.

The switching unit may receive the switching control signal to distinguish a signal input and output through the 5-pole terminal of the universal ear jack according to the cable pin map corresponding to the cable type.

The first pin of the general-purpose ear jack may be coupled to a reference resistor and directly connected to the controller. The reference voltage may be measured using a resistor corresponding to the cable and the reference resistor, and the reference voltage may be transmitted to the controller. .

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

The present invention can be embodied as computer readable codes on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and are also implemented in the form of a carrier wave (for example, transmission over the Internet). It also includes. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

In describing the drawings, similar reference numerals are used for similar components.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. Hereinafter, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

1 is an internal block diagram of a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention.

Referring to FIG. 1, a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention includes, but is not limited to, a universal ear jack 200, a control unit 300, and a switching unit 400. Does not.

The universal earjack 200 is a 5-pole earjack, also known as a stereo earjack, and is distinguished from a 4-pole mono earjack. The universal ear jack 200 is one pin added to the 4-pole ear jack can accommodate both 24-pin I / O connector function, stereo ear jack function.

The 24-pin I / O connector features a number of features, including charging for mobile terminals, USB data for connecting to a computer, UART control for connecting to other external controllers, and hands-free.

However, some of the functions of the 24-pin I / O connector, including the hands-free function, are not used. Therefore, in the embodiment of the present invention, the charging, USB data, and UART control functions are used as the 24-pin I / O connector. Set it.

Therefore, the universal ear jack 200 includes any one of a sound earphone cable, a USB data cable, a universal asynchronous receiver / transmitter (UART) control cable, and a charging cable to accommodate a stereo ear jack function and a 24-pin I / O connector function. The cable plug 110 is inserted.

In the above, each cable is composed of five lines, one end of the cable is connected to the mobile communication terminal side, the other end of the cable is connected to the external device side. In this case, a plug 110 inserted into the universal ear jack 200 is installed at one end of the cable 100 connected to the mobile communication terminal, and the plug 110 is connected to the 5-pole terminal of the universal ear jack 200. It has five contact poles 115 in contact.

In the above, the external device includes all devices that can transmit and receive data connected to the mobile communication terminal, such as earphone, computer, external control device via a cable.

When the plug 110 of the specific cable 100 is inserted into the first pin of the general-purpose ear jack 200, the first contact electrode 115 of the plug 110 contacts the first pin of the formulation.

When the specific cable 100 has the plug 110 inserted, as shown in FIG. 3, the resistance corresponding to the specific cable 100 is modeled as R2. R2 has different resistance values for each cable.

The first pin for cable sensing is directly connected to the ADC pin of the controller 300 through the reference resistor R1. Therefore, the reference voltage is measured based on Equation 1 below and transferred to the analog / digital converter (ADC) pin.

Since the reference voltage has a different value according to the cable 100 connected to the universal ear jack 200 since the R2 of each cable is different, the ADC in the control unit 300 can distinguish the cable type according to the reference voltage value. It stores the cable information. The cable information includes reference voltage values according to the cable type.

Therefore, when the reference voltage is transferred to the ADC pin, the controller 300 checks the cable type corresponding to the reference voltage in the previously stored cable information, and the switching unit 400 performs a switching operation according to the cable. Generate and output a switching control signal.

The controller 300 includes an analog / digital converter for converting an analog signal into a digital signal that can be processed by the system.

The control unit 300 previously defines a cable pin map for the 5-pole terminal of the universal ear jack 200, which is divided by function for each cable (see Table 1), and the cable control map is connected to the switching control signal. Contains information.

Cable pin map Cable type First pin Second pin 3rd pin 4th pin 5th pin Sound earphone Detection (recognition) Right sound Left sound mic GND USB data Detection (recognition) data + Data- VBUS (5V) GND UART control Detection (recognition) TXD RXD DTR GND charge Detection (recognition) Power Power BATT ID GND

As shown in Table 1, the five-pole terminal of the general-purpose ear jack 200 is the first common pin for cable detection and the fifth pin for grounding use a common cable, the second pin, third pin, and fourth pin is Each cable is categorized by function.

Especially, in case of charging cable, 4V or more is input during charging so that two terminals are assigned to the power pin for safe charging, and in the case of UART control cable, the fourth pin for DTR has a data terminal. It is a pin that checks whether it is OK, so it is used only when necessary.

The switching unit 400 receives the switching control signal and allows a signal input / output through the plug 110 of the cable to be connected to a corresponding functional block based on the cable pin map.

That is, the switching unit 400 uses the second, third, and fourth pin signal lines of the general-purpose ear jack according to the switching control signal when the type of the cable is a sound ionphone cable. 510, a USB data cable to a USB function block 520, a UART control cable to a UART interface (I / F) function block 530, and a charging cable To the charging function block 540.

In the above description, the stereo sound 510, the USB 520, and the UART I / F 530 may be included in the controller 300 to operate in software.

Hereinafter, a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

2 is a diagram illustrating a process of checking a cable type in a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention.

Referring to FIG. 2, a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention may include a cable connected to the plug 110 when the plug 110 is inserted into the universal ear jack 200. Resistor R2 is connected to ground and reference resistor R1.

When the reference voltages V _f of R1 and R2 are measured and transmitted to the control unit 300, the control unit 300 checks the cable type according to the voltage value of the reference voltage in the cable information, and the cable corresponding to the checked result. A switching control signal is generated to include the pin map information and transmitted to the switching unit 400.

The switching unit 400 is operated by a switching control signal. The switching unit 400 classifies signals input and output through the plug 110 based on cable pin maps classified according to types of cables, and the signals are configured to provide a specific function in the mobile communication terminal. The signal is connected to the corresponding function block so that it can be executed.

For example, in the case of an external device that performs a stereo ear jack function, a plug of a sound earphone cable is inserted into the universal ear jack 200. In addition, the ADC pin of the controller 300 receives a resistance R2 value corresponding to the sound earphone cable and a reference voltage V _f based on the reference resistor R1, and the controller 300 receives cable information according to the reference voltage. Check that the cable type is sound earphone cable.

The controller 300 generates a switching control signal indicative of the sound earphone cable based on the cable pin map corresponding to the sound earphone cable, and transmits the switching control signal to the switching unit 400, and the switching unit 400 uses a switching control signal for general purpose. The signals input and output from the second, third and fourth pins of the ear jack 200 are connected to the stereo sound function block 510.

That is, the switching unit 400 outputs the right / left sound through the second pin / third pin of the general-purpose ear jack 200 and inputs the sound through the fourth pin.

In the above, the mobile communication terminal can be applied to a portable terminal such as a mobile phone, a PMP, and an MP3 capable of integrating an existing stereo ear jack and a TTA standard 24-pin I / O connector into one universal ear jack.

In the past, at least four external devices with charging, USB data, and UART control, including stereo earjacks, were used to connect to mobile terminals, at least stereo earjacks and 24-pin I / O connectors.

However, a mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention integrates a stereo ear jack function and a 24-pin I / O connector function so that only one 5-pole ear jack can be connected to the external device. Is designed.

Therefore, the mobile communication terminal capable of integrated connection of an external device according to an embodiment of the present invention can reduce the space required for the connection to the external device compared to the existing device, the PCB space shortage problem or the cost of parts can be reduced.

According to the mobile communication terminal capable of integrated connection of the external device as described above, the integrated design of the plurality of connector functions to be possible with only one universal ear jack reduces the connector space required for the connection with the external device compared to the conventional one, resulting in a shortage of PCB space. In addition to being reduced, there is an effect that the unit cost of parts can be reduced.

In addition, according to the mobile communication terminal capable of integrated connection of the external device as described above, since only one universal ear jack is installed in the mobile communication terminal and the problem of shortage of PCB space is solved to some extent, it is possible to realize the light and small size of the mobile communication terminal. It works.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (8)

A general-purpose ear jack to which a plug of a specific cable is contacted among a plurality of cables for connecting each external device and a mobile communication terminal for an ear microphone function or various data input / output functions; When the plug of the specific cable is connected to a specific terminal of the general-purpose ear jack, the reference voltage and the plurality of reference voltage values measured by voltage division of the resistance value R2 with respect to the reference resistance R1 and the resistance value R2 corresponding to the specific cable A controller configured to generate and output a switching control signal indicative of the specific cable type corresponding to the measured reference voltage based on cable information capable of classifying a cable type according to the types of cables; And A switching unit for performing a signal transfer function between the external device corresponding to the type of the specific cable and the mobile communication terminal in response to the switching control signal. A mobile communication terminal capable of integrated connection of an external device including a. The method of claim 1, The plurality of cables for connecting each external device and the mobile communication terminal includes at least one of a sound earphone cable, a USB data cable, a universal asynchronous receiver / transmitter (UART) control cable, and a charging cable Mobile communication terminal capable of integrated connection of external devices. The method of claim 1, The universal earjack is a 5-pole earjack, Among the five-pole terminals of the general-purpose ear jack, the first and second pins for detecting cables are used as a common cable, and the second, third, and fourth pins are distinguished by function for each cable. A mobile communication terminal capable of integrated connection of an external device. The method of claim 3, The control unit is a mobile communication terminal capable of integrated connection of an external device, characterized in that for pre-defining a cable pin map (cable pin map) for the 5-pole terminal of the general-purpose ear jack for each cable. The method according to claim 2 or 4, The cable pin map is, In the case of the sound earphone cable, the first pin-cable detection, the second pin / third pin-right / left sound (RIGHT / LEFT SOUND), the fourth pin-mic (MIC). 5th pin to ground, In the case of the USB data cable, the first pin-cable detection, the second pin / third pin-data (+,-), the fourth pin-power signal (VBUS), the fifth pin-ground, In the case of the UART control cable, the first pin-cable detection, the second pin-transmit signal, the third pin-receive signal, the fourth pin-DTR (Data Terminal Ready), the fifth pin-ground In the case of the charging cable, the first pin-cable detection, the second pin / third pin-power supply, the fourth pin-battery ID (ID), characterized in that the fifth pin-ground of the external device Mobile communication terminal with integrated access. The method of claim 5, In the case of the UART control cable, the fourth pin is used only when it is necessary to check whether the data terminal is OK. The method of claim 4, wherein The switching unit receives the switching control signal and distinguishes signals input and output through the 5-pole terminal of the universal ear jack according to a cable pin map corresponding to the cable type. terminal. The method of claim 3, The first pin of the universal ear jack is coupled to the reference resistor R1 and directly connected to the control unit, and the reference voltage is divided by a voltage division of a resistor corresponding to the cable to the reference resistor R1 and a resistor corresponding to the cable. And the reference voltage is transmitted to the controller at the same time when the measurement is performed.

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