KR20040026759A - Circuit for detecting earjack automatically ane method thereof - Google Patents

Abstract

PURPOSE: A circuit and a method for automatically sensing an ear jack are provided to prevent the terminal from being damaged from the mistake of the user by inserting a logic circuit capable of automatically recognizing whether one of strobe and ear/mike set is inserted into the ear jack or not. CONSTITUTION: A circuit for automatically sensing an ear jack includes a mobile station modem(MSM)(210), a strobe controller, a sensing block(240), an ear/mike set controller and an ear jack. The MSM(210) receives a sensing signal and a plug discrimination signal, outputs a charge control signal and a shut control signal when the plug discrimination signal is a second logic stage. And MSM(210) outputs an audio signal when the plug discrimination signal is the first logic stage and receives mike signal. The strobe controller receives a power voltage, the charge control signal and the shut control signal in the MSM(210), and it outputs the shut signal in response to the shut control signal. The sensing block(240) outputs the sensing signal to the MSM(210) when the plug is inserted. The ear/mike set controller generates the speaker signal and outputs the speaker signal. The ear/mike set controller generates the mike signal and outputs the mike signal to the MSM(210). And, the ear jack transforms the status of the plug insertion to the sensing block(240) and outputs the plug discrimination signal to the MSM(210).

Description

Ear jack automatic detection circuit and method {CIRCUIT FOR DETECTING EARJACK AUTOMATICALLY ANE METHOD THEREOF}

The present invention relates to an ear jack automatic detection circuit and method, and more particularly, to an ear jack automatic detection circuit and method for automatically detecting a strobe and earphone / microphone set connected through an ear jack in a terminal equipped with a digital camera.

In general, with the advancement of the terminal technology and advanced and diversified functions such as digital camera function is required, many implementation methods have been proposed. The terminal camera is mainly built-in, the strobe (camera flash) function is required It is becoming.

1 is a block diagram illustrating a conventional ear jack interface device, which includes: an MSM 110 that outputs a charge control signal and a shut control signal upon receiving a first sensing signal; The strobe control unit receives a power supply voltage, receives a charge control signal or a shut control signal from the MSM 110, integrates the power supply voltage and the charge control signal into the charging power, and outputs a shut signal according to the shut control signal. 120); The sensing unit 130 outputs the first sensing signal to the MSM 110 when the first sensing control signal is input, and outputs the second sensing signal to the MSM 110 when the second sensing control signal is input. ; An ear microphone controller 140 for maintaining a microphone voice signal line and a speaker signal line in a high impedance state when an external strobe module is applied; And a microphone voice signal line and a speaker signal line are connected, the charging power is applied from the strobe controller 120 to charge the external strobe module, the shut-off signal is input from the strobe controller 120 to discharge the external strobe module, and the external strobe module is connected. In this case, the first sensing control signal is output to the sensing unit 130, and when the external ear microphone module is applied, the ear jack 150 outputs the second sensing control signal to the sensing unit 130.

However, in the above-described conventional ear jack interface device, since the user has to perform a procedure for checking whether or not to use on the menu of the terminal, an external strobe must be inserted and used, which causes a very troublesome problem. In addition, when a user accidentally inserts an ear / microphone set and operates a strobe, there is a problem in that the instant strobe charging / discharging current has a fatal effect on the terminal.

The present invention devised to solve the above problems, by adding a logic circuit that can automatically recognize which of the strobe and ear / microphone set is inserted into the ear jack, to prevent the terminal damage due to the user's mistake, It is an object of the present invention to provide an ear jack automatic sensing circuit and method for convenience.

1 is a block diagram showing a conventional ear jack interface device,

2 is a block diagram showing an automatic ear jack detection circuit according to an embodiment of the present invention;

3A is a circuit diagram showing in detail the components mounted in the ear jack automatic sensing circuit according to an embodiment of the present invention;

3B and 3C are exemplary views showing ear / mic plugs and strobe plugs,

Figure 4 is a block diagram showing an automatic ear jack detection method according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

210: MSM220: Melody IC

230: strobe control unit 240: detection unit

250: ear / microphone set control unit 260: ear jack

In order to achieve the above object, the ear jack automatic detection circuit of the present invention receives a detection signal and a plug separation signal, and outputs a charge control signal and a shut control signal when the plug separation signal is a second logic step. An MSM for outputting a voice signal and receiving a microphone signal when the plug separation signal is the first logic step; Receiving a power supply voltage, receiving the charge control signal or the shut control signal from the MSM, integrating the power supply voltage and the charge control signal into a charging power source, and outputting a shut signal according to the shut control signal; Strobe controller; A detector for outputting the detection signal to the MSM when a plug is inserted; An ear / microphone set control unit configured to receive and amplify a voice signal from the MSM to generate a speaker signal, output the speaker signal, generate a microphone signal by receiving a microphone voice signal, and output the microphone signal to the MSM; And an ear jack for transmitting a plug insertion state to the detection unit and outputting the plug separation signal to the MSM.

In addition, in order to achieve the above object, the automatic ear jack detection method of the present invention comprises the steps of: determining whether a plug is inserted into the ear jack; When the plug is inserted into the ear jack, determining whether the inserted plug is a strobe plug-in ear / microphone plug-in; And when the inserted plug is a strobe plug-in, performing a strobe operation.

Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the technical idea of the present invention. .

First, Figure 2 is a block diagram showing the ear jack automatic detection circuit according to an embodiment of the present invention, the ear jack automatic detection circuit of the present invention, MSM (Mobile Station Modem) 210, melody IC 220, The strobe controller 230, the detector 240, the ear / microphone set controller 250, and the ear jack 260 are included.

The MSM 210 outputs an operation control signal to the melody IC 220 to be described later, receives a plug classification signal from the ear jack 260 to be described later through the sensing unit 240 to be described later, and the plug classification signal. Is a second logic step (High) to output a charge control signal and a shot control signal to the strobe control unit 230 to be described later, when the plug separation signal is a first logic step (Low) to be described later It outputs a voice signal to the ear microphone set control unit 250, and receives a microphone signal from the ear microphone set control unit 250 to be described later. Here, the MSM 210 may be configured as an embedded processor, MSMxxxx, etc. of Qualcomm as a main control plug. That is, the MSM 210 performs overall control of the terminal.

In addition, the melody IC 220 receives the operation control signal from the MSM 210, and outputs a reception bell signal to the ear / microphone set control unit 250 to be described later according to the operation control signal.

Meanwhile, the strobe controller 230 receives a power supply voltage, receives a charge control signal or the shot control signal from the MSM 210, and integrates the power supply voltage and the charge control signal into a charging power source. It is applied to the ear jack 260 to be described later, and serves to output a shot signal to the ear jack 260 to be described later in accordance with the shot (shot) control signal.

In addition, the sensing unit 240 is connected to the ear jack 260 to be described later, and serves to output the detection signal to the MSM 210 when a plug is inserted into the ear jack 260 to be described later.

In addition, the ear / microphone set control unit 250 receives the amplified voice signal from the MSM 210 to generate a speaker signal, and outputs the speaker signal to the ear jack 260 which will be described later. It receives the microphone voice signal from the (260) generates a microphone signal, and serves to output the microphone signal to the MSM (210).

Meanwhile, when the plug is inserted, the ear jack 260 outputs a plug classification signal to the MSM 240 and charges an external strobe (not shown) by receiving charging power from the strobe controller 230. And receiving a shut signal from the strobe controller 230 to discharge an external strobe (not shown), and receiving an speaker signal from the ear / mic set controller 250 to receive an external ear microphone (not shown). And transmits a microphone voice signal from an external ear microphone (not shown) to the ear / microphone set control unit 250.

3A is a circuit diagram illustrating in detail the components mounted in the ear jack auto sensing circuit according to an embodiment of the present invention, and FIGS. 3B and 3C are exemplary views illustrating ear / microphone plugs and stroboscopic plugs. As follows.

The MSM 210 is assigned a GPIO terminal having a resistance Ra of about 64 mA, and includes a resistor 311 and a buffer 312.

The resistor 311 mounted in the MSM 210 has a first terminal connected to a power supply voltage Vcc and a second terminal connected to a plug classification signal input line to provide a resistance value. Here, the power supply voltage is about 3V.

In addition, the buffer 312 mounted in the MSM 210, an input terminal is connected to the second terminal of the resistor 311, and receives the plug classification signal to temporarily store and then outputs the output. .

The ear jack 260 may include a first terminal g connected to a speaker terminal b of an ear / microphone set plug or a shot terminal e of a strobe plug, and a second terminal j of the ear jack 260. The third terminal h is connected to the GPIO pin of the MSM 210, and the fourth terminal i is grounded.

Referring to the operation of the ear jack automatic detection circuit of the present invention described above are as follows.

First, when the ear / microphone set plug is inserted into the ear jack 260, the microphone terminal a is connected to the third terminal h of the ear jack 260, and the speaker terminal b is connected to the first terminal g. ), And the ground terminal (c) is connected to the fourth terminal (i). Afterwards, when it is detected that the plug is inserted through the second terminal j of the ear jack 260, the sensing unit 240 outputs a sensing signal to the MSM 210. Next, when the MSM 210 receives the detection signal from the detection unit 240, the MSM 210 receives the plug classification signal from the third terminal h of the ear jack 260, and the ear / microphone set plug is inserted. The impedance Rb of the microphone terminal interfaced with the GPIO satisfies approximately 1.2 Hz. Therefore, the voltage Vi level value of the component as shown in the following formula is input to the GPIO.

: First logic level

That is, since the plug separation signal is the first logic step Low, the voice signal is output to the ear / microphone set control unit 250, and the microphone signal is received from the ear / microphone set control unit 250. Subsequently, the ear / microphone set control unit 250 receives and amplifies a voice signal from the MSM 210 to generate a speaker signal, outputs the speaker signal to the ear jack 260, and outputs a microphone from the ear jack 260. When the voice signal is input, a microphone signal is generated, the microphone signal is output to the MSM 210, and when the strobe plug is applied to the ear jack 260, the microphone voice signal line and the speaker signal line are maintained in a high impedance state.

In addition, when the strobe plug is inserted into the ear jack 260, the charge control signal terminal d is connected to the third terminal h of the ear jack 260, and the shut terminal e is connected to the first terminal g. Ground terminal (f) is connected to the fourth terminal (i). Subsequently, if it is detected that the plug is inserted through the second terminal j of the ear jack 260, the sensing unit 240 outputs a sensing signal to the MSM 210. Next, when the MSM 210 receives the detection signal from the detection unit 240, the MSM 210 receives the plug classification signal from the third terminal h of the ear jack 260. The impedance of the charge control signal terminal to be interfaced satisfies approximately 2 kW. Therefore, the voltage Vi level value of the component as shown in the following formula is input to the GPIO.

: Second logic level (High Level)

That is, since the plug classification signal is the second logic step High, the charging control signal and the shot control signal are output to the strobe controller 230. Subsequently, the strobe controller 230 receives a power supply voltage, receives a charge control signal or a shot control signal from the MSM 210, integrates the power supply voltage and the charge control signal into the charging power, and connects the ear jack 260. Is applied to the third terminal (h) and outputs a shut signal to the ear jack 260 according to the shut control signal.

As shown in the above results, the impedance value of the ear / mic set plug terminal is relatively small with respect to the pull-up resistance of the GPIO of the MSM chip, whereas the impedance of the stroboscopic plug satisfies an extremely large value. The input voltage level is satisfied.

That is, since the first logic stage Low is inserted when the ear / microphone set is inserted and the second logic stage High when the strobe is inserted, the type of plug can be detected. Here, the ear / microphone set may be three-pole or four-pole, and the configuration of the ear jack may be different for each company.

4 is a block diagram illustrating an automatic ear jack detection method according to an embodiment of the present invention.

First, it is determined whether the plug is inserted into the ear jack 260 (S401). In this case, when the plug is not inserted into the ear jack 260, the general call operation of the terminal is performed (S404).

When the plug is inserted into the ear jack 260, it is determined whether the inserted plug is a strobe plug-in ear / microphone plug (S402).

If the inserted plug is a strobe plug-in, the MSM 210 outputs a charge control signal and a shot control signal to the strobe controller 230. Subsequently, the strobe controller 230 receives a power supply voltage, receives a charge control signal or a shot control signal from the MSM 210, integrates the power supply voltage and the charge control signal into the charging power, and connects the ear jack 260. The third terminal h is applied to the third terminal h, and the shot signal is output to the ear jack 260 according to the shot control signal (S403).

In addition, when the inserted plug is an ear / microphone set plug-in, the ear / microphone set control unit 250 receives the audio signal from the MSM 210 to amplify the speaker signal, and generates a speaker signal, and then converts the speaker signal into the ear jack 260. And outputs a microphone voice signal from the ear jack 260 to generate a microphone signal, and outputs the microphone signal to the MSM 210, and when the strobe plug is applied to the ear jack 260, the microphone voice signal line and the speaker The signal line is maintained in a high impedance state (S405).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings shown.

The present invention has the advantage of preventing terminal damage due to a user mistake and providing convenience by adding a logic circuit that can automatically recognize which of the strobe and the ear / microphone set is inserted in the ear jack.

Claims (6)

A detection signal and a plug separation signal are input, and when the plug separation signal is a second logic stage, a charge control signal and a shut control signal are output. When the plug separation signal is a first logic stage, a voice signal is output. MSM receiving a microphone signal; Receiving a power supply voltage, receiving the charge control signal or the shut control signal from the MSM, integrating the power supply voltage and the charge control signal into a charging power source, and outputting a shut signal according to the shut control signal; Strobe controller; A detector for outputting the detection signal to the MSM when a plug is inserted; An ear / microphone set control unit configured to receive and amplify a voice signal from the MSM to generate a speaker signal, output the speaker signal, generate a microphone signal by receiving a microphone voice signal, and output the microphone signal to the MSM; And Ear jack for transmitting whether the plug is inserted into the detection unit, and outputs the plug identification signal to the MSM Ear jack auto-sensing circuit comprising a. The method of claim 1, wherein the MSM, A first terminal connected to a power supply voltage, and a second terminal connected to a plug division signal input line; And An input terminal is connected to the second terminal of the resistor, a buffer for receiving and temporarily storing the plug-in signal and then outputting the buffer. Ear jack auto-sensing circuit comprising a. The method of claim 1, The ear jack has a plurality of terminals, one terminal of which is connected to a GPIO pin of the MSM. Ear jack automatic detection circuit, characterized in that. Determining whether a plug is inserted into the earjack; When the plug is inserted into the ear jack, determining whether the inserted plug is a strobe plug-in ear / microphone plug-in; And If the inserted plug is a strobe plug-in, performing a strobe operation Earjack detection method comprising a. The method of claim 4, wherein If the plug is not inserted into the earjack, performing a general call operation of the terminal Earjack detection method comprising a. The method of claim 4, wherein If the inserted plug is an ear / microphone set plug-in, performing the ear / microphone operation Earjack detection method comprising a.