KR100626519B1 - Apparatus of connecting a external device in the mobile communication terminal - Google Patents

Abstract

The present invention relates to an external device connection device in a mobile communication terminal to cut off a voltage induced in a data communication line from an external device when the external device is used in a mobile communication terminal. And an external device access device in a mobile communication terminal equipped with a mobile station modem (MSM) for processing transmission data, which cuts off a voltage induced in a reception and transmission data line through the kit from the external device, And a switching unit for switching the reception and transmission data between the kit and the MSM, thereby preventing a malfunction of the mobile communication terminal due to voltage induced at low cost, and at the same time, a mobile communication terminal and an external device. Stable communication between Can be done.

Description

Apparatus of Connecting a External Device in the Mobile Communication Terminal}

1 is a view for explaining an external device connection apparatus in a general mobile communication terminal.

FIG. 2 is a diagram for explaining data on a receiving and transmitting data line in FIG. 1; FIG.

3 is a block diagram illustrating an external device access apparatus in a mobile communication terminal according to an exemplary embodiment of the present invention.

FIG. 4 is a diagram for explaining data on a receiving and transmitting data line in FIG. 3; FIG.

Explanation of symbols on the main parts of the drawings

31: Carkit

32: MSM (Mobile Station Modem)

33, 34: switching element

The present invention relates to an external device connection device in a mobile communication terminal, and more particularly to an external device connection device in a mobile communication terminal to cut off the voltage induced in the data communication line from the external device when using the external device in the mobile communication terminal. will be.

In a typical mobile communication terminal, an external device connection device includes a kit 21 and an MSM 22, as shown in FIG. 1, between the kit 21 and the MSM 22. It is connected by data line and transmission data line.

The kit 21 is connected to the connection jack of the external device 10 to connect the external device 10 and the mobile communication terminal 10 to transmit and receive data with the external device 10, The MSM 22 processes data received from the corresponding kit 21 through the corresponding receiving data line and transmits data to the corresponding kit 21 via the corresponding transmitting data line.

In this case, when the connection jack of the external device 10, in particular, a traffic information communication terminal (for example, Nate Drive Kit) is connected to the kit 21 and used, In the reception data line and the transmission data line connecting between the 21 and the MSM 22, a predetermined voltage (i.e., 3 (V)) is induced from the external device 10 and directly connected to the MSM 22. If it is applied to, there is a possibility of causing a malfunction of the MSM (22).

In particular, when the mobile communication terminal 20 is turned on after the mobile communication terminal 20 is turned off after connecting with the external device 10, the MSM 22 Before this normal booting, a predetermined voltage is already induced to the data line and is directly applied to the MSM 22, which may cause various malfunctions.

And, as shown in FIG. 2, while the high level of received data applied to the MSM 22 from the external device 10 through the kit 21 is 3 (V), The high level of transmission data applied from the MSM 22 to the external device 10 via the kit 21 is 2.7 (V).

Thus, for stable data communication between the external device 10 and the mobile communication terminal 10, the high level of the received data is lowered to 2.7 (V) before the received data enters the MSM 22. In addition, it is necessary to raise the high level of the transmission data to 3 (V) before the transmission data is transmitted to the external device 10.

As described above, in the conventional mobile communication terminal, the external device connection device has a disadvantage in that a voltage induced by the external device is directly applied to the MSM, which may cause various malfunctions. It needs to change.

In order to solve the above disadvantages or necessity, the present invention provides an external device in a mobile communication terminal to prevent a malfunction of the mobile communication terminal caused by voltage induced in the data communication line when the external device is used in the mobile communication terminal. It is an object to provide a connection device.

In addition, in the present invention, when an external device is connected to the mobile communication terminal, the voltage induced in the data communication line is prevented from entering the MSM, thereby preventing malfunction of the mobile communication terminal and simultaneously between the mobile communication terminal and the external device. The purpose of the data communication is to perform smoothly.

In addition, when the Nate drive kit is connected to the mobile communication terminal and used, the present invention blocks a voltage induced by the Nate drive kit by using a simple circuit element and simultaneously converts the level of communication data to perform stable communication. In order to solve the disadvantages and the necessity of the prior art by using a circuit device of a relatively low price, the object is to.

An external device connection apparatus in a mobile communication terminal according to an embodiment of the present invention for achieving the above object is a mobile communication terminal having a kit for connecting to the external device, and the MSM for processing received and transmitted data. An apparatus for connecting an external device to a device, the apparatus comprising: a switching unit which cuts off a voltage induced in a reception and transmission data line from the external device through the kit and switches the reception and transmission data between the kit and the MSM. Characterized in that made.

The switching unit converts the level of received data applied from the kit to a level suitable for the MSM, and converts the level of transmitted data applied from the MSM to a level suitable for the external device. .

Preferably, the switching unit comprises: a first switching element for blocking a voltage induced in the received data line and converting the level of received data applied to the received data line to a level suitable for the MSM and switching to the MSM; And a second switching element which cuts off the voltage induced in the transmission data line, converts the level of transmission data applied from the MSM into a level suitable for the external device, and switches to the kit via the transmission data line. It is characterized by.

Further preferably, the first switching element is an NPN transistor.

Also preferably, the first switching element may include a pull-down resistor for forming a pull-down voltage of a level suitable for the MSM.

Also, preferably, the first switching device blocks the voltage induced by the received data line by not receiving the pull-down voltage until the MSM is normally booted, and switches on the received data through the received data line. And switch the pull-down voltage to the MSM.

Further preferably, the second switching element is a PNP type transistor.

Also preferably, the second switching element may include a pull-up resistor for forming a pull-up voltage of a level suitable for the external device.

Also preferably, the second switching element cuts off the voltage induced in the transmission data line before the MSM is normally booted, and is switched off by receiving transmission data from the MSM to switch the pull-up voltage to the transmission data line. Switching to the khaki through.

According to the present invention, when an external device (especially a traffic information communication terminal) is connected to a mobile communication terminal, a simple circuit element, i.e., a switching element (e.g., By blocking the voltage induced in the data line from the external device using a transistor, it is possible to prevent the malfunction of the mobile communication terminal caused by the induced voltage induced. In addition, the present invention is to use the switching element as a relatively low-cost transistor, to perform data communication between the mobile communication terminal and the external device using a transistor having a short switching time, and together with the pull-up and pull-down voltage When the data communication between the mobile communication terminal and the external device is converted to a level suitable for each other, it is possible to provide a stable communication between the mobile communication terminal and the external device with a cost reduction effect. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the mobile communication terminal according to an embodiment of the present invention, as shown in FIG. 3, an external device connection apparatus includes a kit 31, an MSM 32, a first switching element 33, and a second switching element. 34 is made.

The kit 31 may be connected to an external device, in particular, a connection jack of a traffic information communication terminal (for example, a Nate drive kit) to connect the external device to the mobile communication terminal to transmit and receive data with the external device. The data received from the corresponding external device (that is, the received data) is applied to the first switching element 33 through the receiving data line, and from the second switching element 34 through the transmission data line. The data to be switched (that is, the transmission data) is transmitted to the corresponding external device. At this time, the high level of the received data and the transmitted data on the side of the kit 31 is 3 (V) as shown in Fig. 4A, that is, the high level of the received data and the transmitted data used in the corresponding external device. It is the same as phosphorus 3 (V).

The MSM 32 processes the received data switched from the first switching element 33 and processes the transmission data to apply to the second switching element 34. At this time, the high level of the received data and the transmitted data on the MSM 32 side is 2.7 (V) as shown in (b) of FIG. 4, that is, the high level of the received data and the transmitted data used by the MSM 32. It is the same level as 2.7 (V).

The first switching element 33 is a simple circuit element provided on the receiving data line, and switches the received data applied from the kit 31 through the receiving data line to the MSM 32. While blocking the voltage (for example, 3 (V)) induced in the received data line from the external device through the khaki 31, at the same time through the received data line from the khaki 31 The level of the received received data (i.e., 3 (V)) is converted to a level suitable for the MSM 32 (i.e., 2.7 (V)) to switch the converted received data to the MSM 32.

For example, as shown in FIG. 3, the first switching element 33 uses an NPN transistor having a short switching time, and a pull-down voltage (ie, 2.7 (V)) at the emitter terminal side. And a pull-down resistor R1 for forming the same. For example, when the first switching element 33 is a corresponding NPN transistor, when the power of the mobile communication terminal is turned off (that is, before the MSM 32 is normally booted), the power of the mobile communication terminal Since a power supply (i.e., 2.7 (V)) is not applied at the collector terminal side from a supply block (not shown in the drawing for convenience of description), the external device is connected to the receiving data line through the kit 31. Even if the induced voltage (for example, 3 (V)) is input to the base terminal side, it does not switch to the MSM 32, while the reception from the kit 31 is received when the mobile communication terminal is turned on. Receive data is received from the base terminal through the data line, and when the level of the received data is 'low' (ie, 0 (V)), it is switched off to supply power to the mobile communication terminal. The power source (i.e., 2.7 (V)) applied from the block is not switched to the MSM 32, and is switched on when the level of the corresponding received data is 'high' (ie, 3 (V)). The power applied from the power supply block of (i.e., 2.7 (V)) is formed in the corresponding pull-down resistor R1 to switch to the MSM 32.

The second switching element 34 is a simple circuit element provided on the transmission data line. The second switching element 34 switches the transmission data applied from the MSM 32 to the kit 31 through the transmission data line. While blocking the voltage (for example, 3 (V)) induced in the transmission data line from the external device through the kit 31, the level of transmission data applied from the MSM 32 ( That is, 2.7 (V)) is converted to a level suitable for the external device (that is, 3 (V)) to switch the converted transmission data to the kit 31 through the transmission data line.

For example, as shown in FIG. 3, the second switching element 34 uses a short switching time PNP transistor, and a pull-up voltage (ie, 3 (V)) at the emitter terminal side. It comprises a pull-up resistor (R2) to be formed. For example, when the second switching element 34 is a corresponding PNP type transistor, when the power of the mobile communication terminal is turned off, the power supply (that is, 3 (V)) is already received from the power supply block of the mobile communication terminal. Since the transmit data line is not applied at the emitter terminal side and is connected to the emitter terminal side, a voltage (for example, 3 (V) induced from the external device to the transmit data line through the kit 31. Even if the)) is input, it does not switch to the MSM 32, whereas when the mobile communication terminal is powered on, transmission data is received from the MSM 32 at the base terminal side. 'Low' (i.e., 0 (V)) is switched on to ground the power (i.e., 3 (V)) applied from the power supply block of the mobile communication terminal to ground through the transmission data line. When the level of the corresponding transmission data is 'high' (that is, 3 (V)), the power is applied to the power supply block of the mobile communication terminal (i.e., 3 (3)). V)) is formed in the corresponding pull-up resistor R2 to switch to the kit 31 via the transmission data line.

Referring to the operation of the external device access device in the mobile communication terminal according to an embodiment of the present invention.

In this case, when an external device, in particular, a traffic information communication terminal (for example, a Nate drive kit) is connected to the mobile communication terminal and used, the received data between the kit 31 and the MSM 32 of the mobile communication terminal. A simple circuit element, that is, switching elements 33 and 34 implemented on a line and a transmission data line, respectively, may be used, and the data may be received from the corresponding external device using the switching elements 33 and 34. The description will be made by dividing the data to the external device.

First, when receiving data from the external device, the kit 31 is connected to the connection jack of the external device to connect between the external device and the mobile communication terminal, the data from the external device In response to the received data, the received data is applied to the first switching device 33 through the receiving data line. Here, the high level of the received data is 3 (V) as shown in Fig. 4A.

However, when the mobile communication terminal is turned on after connecting with the external device in a state where the mobile communication terminal is turned off, before the MSM 32 is normally booted, the car is already received from the external device. A predetermined voltage (for example, 3 (V)) is induced to the receiving data line through the kit 31, wherein the first switching element 33 is induced to the receiving data line. For example, 3 (V)) can be blocked to prevent a malfunction that may occur when using the external device.

In more detail, the first switching element 33 uses an NPN transistor having a short switching time, for example, as shown in FIG. 3, but before the MSM 32 boots normally. Since a power supply (ie, 2.7 (V)) is not applied from the power supply block of the mobile communication terminal on the collector terminal side, even when a voltage induced (for example, 3 (V)) is input to the received data line, The MSM 32 serves to block the voltage so as not to induce voltage.

In addition, the first switching element 33 adjusts a level (ie, 3 (V)) of received data applied from the kit 31 through the reception data line to a level suitable for the MSM 32. , 2.7 (V) to convert the received received data into the MSM 32, so that the MSM 32 switches the received data (i.e., 2.7 ( V)).

That is, as shown in FIG. 3, the first switching device 33 receives received data from its kit terminal 31 through its received data line at its base terminal, and at this time, the level of the received data. Is low (i.e., 0 (V)), it is switched off and does not switch power (i.e., 2.7 (V)) applied from the power supply block of the mobile communication terminal to the MSM 32. The received data applied to the MSM 32 also becomes '0'.

On the other hand, when the level of the received data is 'high' (i.e., 3 (V)), it is switched on to supply the power (i.e., 2.7 (V)) applied from the power supply block of the mobile terminal. It is formed in the pull-down resistor (R1) connected to the emitter terminal side to switch to the MSM 32, so that the shift instead of the level of the received data applied through the receive data line (i.e., 3 (V)). A signal of '1' is applied to the MSM 32 at a level of power applied from a power supply block of a communication terminal (ie, 2.7 (V)), and a voltage of 3 (V) is applied to the MSM 32. Is applied to the MSM 32.

Secondly, when transmitting data to the external device, the MSM 32 processes the data to be transmitted to the external device and applies the processed transmission data to the second switching element 34. At this time, the high level of the transmission data is 2.7 (V) as shown in FIG.

However, when the mobile communication terminal is turned on after the mobile communication terminal is connected to the external device while the mobile communication terminal is turned off, the MSM 32 is already booted normally as described above. A predetermined voltage (e.g., 3 (V)) is induced from the external device to the transmission data line through the khaki 31, wherein the second switching element 34 is induced in the transmission data line. Blocking the voltage (for example, 3 (V)) to prevent the malfunction that may occur when using the external device.

In more detail, the second switching element 34 uses a short switching time PNP type transistor, as shown in FIG. 3, for example, before the MSM 32 boots normally. Since the transmission data line is connected to its emitter terminal side without receiving power (i.e., 3 (V)) from the power supply block of the mobile communication terminal on the emitter terminal side, the transmission data line is rejected. Even if a voltage (for example, 3 (V)) is input, the MSM 32 serves to block the voltage so as not to be induced.

The second switching element 34 converts the level of the transmission data applied from the MSM 32 (ie, 2.7 (V)) to a level suitable for the external device (ie, 3 (V)). The converted transmission data is switched to the khaki 31 through the transmission data line, so that the khaki 31 is switched from the second switching element 34 through the transmission data line ( That is, 3 (V)) is transmitted to the external device.

That is, as shown in FIG. 3, the second switching element 34 receives the transmission data from the MSM 32 at its base terminal side, wherein the level of the corresponding transmission data is 'low' (ie, 0 (V)), the kit 31 is switched on through the transmission data line by grounding the power supply (that is, 3 (V)) applied from the power supply block of the mobile communication terminal. The transmission data applied to the external device via this also becomes '0'.

On the other hand, when the level of the transmission data is 'high' (i.e., 3 (V)), it is switched off to supply the power (i.e., 3 (V)) applied from the power supply block of the mobile communication terminal. It is formed in the pull-up resistor R2 connected to the emitter terminal side and switched to the kit 31 through the transmission data line, so that the level of transmission data applied from the MSM 32 (i.e., 2.7 ( V)) is transmitted to the external device via the kit 31 via the transmission data line at the level of power applied from the power supply block of the mobile communication terminal (i.e., 3 (V)), and A voltage of 3 V is applied to the external device, and a signal of '1' is applied to the external device.

As described above, in the mobile communication terminal according to an embodiment of the present invention, the external device connection device performs data communication using switching of the transistors 33 and 34. The transistors 33 and 34 are connected to each data line. To cut off the voltage induced by the external device. In this case, the transistors 33 and 34 use a short switching time to prevent data communication, and to adjust the high level of data using a pull-up voltage. This prevents malfunctions that may occur when using an external device, changes to a level suitable for each other during data communication between the external device and the mobile communication terminal, and enables stable communication, and also provides a relatively low-cost transistor ( 33, 34) to solve the conventional problems to provide a cost-saving effect.

As described above, when an external device is connected to a mobile communication terminal using a simple circuit element having a relatively low cost, the voltage induced by the external device is blocked from entering the MSM, and By appropriately converting the communication data level between the mobile communication terminal and the external device, it is possible to prevent the malfunction of the mobile communication terminal due to voltage induced at low cost and to perform stable communication between the mobile communication terminal and the external device. .

Claims (9)

An external device access apparatus in a mobile communication terminal having a kit for connecting to an external device and a mobile station modem (MSM) for processing received and transmitted data, And a switching unit which cuts off a voltage induced in a receiving and transmitting data line from the external device through the kit and switches the receiving and transmitting data between the kit and the MSM. External device connection device in the terminal. The method of claim 1, The switching unit converts the level of the received data applied from the khaki to a level suitable for the MSM, and converts the level of transmission data applied from the MSM to a level suitable for the external device. External device connection device in the terminal. The method of claim 1, The switching unit cuts off a voltage induced in the received data line and converts the level of the received data applied to the received data line into a level suitable for the MSM and switches to the MSM; And a second switching element which cuts off the voltage induced in the transmission data line, converts the level of transmission data applied from the MSM into a level suitable for the external device, and switches to the kit via the transmission data line. External device connection device in the mobile communication terminal, characterized in that. The method of claim 3, And the first switching element is an NPN transistor. The method of claim 3, The first switching device includes a pull-down resistor for forming a pull-down voltage of a level suitable for the MSM, the external device connecting device in the mobile communication terminal. The method of claim 5, The first switching device blocks the voltage induced in the receiving data line by not receiving the pulldown voltage until the MSM is normally booted, and is switched on by receiving the receiving data through the receiving data line. And an external device connection device in a mobile communication terminal. The method of claim 3, And the second switching element is a PNP type transistor. The method of claim 3, And the second switching element includes a pull-up resistor for forming a pull-up voltage of a level suitable for the external device. The method of claim 8, The second switching element cuts off the voltage induced on the transmission data line before the MSM normally boots, and is switched off by receiving transmission data from the MSM to switch the pull-up voltage to the khaki through the transmission data line. External device connection device in the mobile communication terminal, characterized in that.

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