KR100365612B1 - Circuit and method for automatically detecting valid key pressing in mobile communication terminal - Google Patents

Abstract

The present invention relates to a method for improving the battery life of the overall mobile communication terminal by preventing unnecessary loss of battery capacity of the mobile communication terminal, and automatically detects the input of the pressed key irrespective of the user's intention. By ignoring the key value, only the input of the key intentionally pressed by the user automatically performs a corresponding function corresponding to a valid key press.

Description

Effective keypress automatic detection circuit and method of mobile communication terminal {CIRCUIT AND METHOD FOR AUTOMATICALLY DETECTING VALID KEY PRESSING IN MOBILE COMMUNICATION TERMINAL}

The present invention relates to a method for improving battery life of a mobile communication terminal, and more particularly, to an effective keypress automatic detection circuit and method of a mobile communication terminal.

The mobile communication terminal has a keypad including a plurality of keys in its function and a plurality of keys protruding outward. Therefore, protruding keys or keys covered by the keypad cover may be pressed regardless of the user's intention. In particular, the keys are frequently pressed according to the method of carrying the terminal or the position of the terminal.

However, even if such a meaningless key press is performed, the terminal performs a normal key processing operation, and thus a battery usage time is frequently shortened significantly compared to the reference time.

Hereinafter, the prior art of the technical field to which the present invention belongs will be described with reference to FIGS. 2A and 2B.

2A is a diagram illustrating a key matrix structure according to the prior art, and FIG. 2B is a diagram illustrating the structure of a key scan and interrupt circuit according to the prior art. KEYSENSE4-0 of FIG. 2B is the same as KEYSENSE2-0 signal of FIG. 2A, although the number is different, it should be understood that they are shown differently for convenience of description. Referring to FIGS. 2A and 2B, the kisscan operation of the mobile communication terminal according to the related art will be described in detail as follows.

Key processing of the mobile communication terminal is composed of the KEYSENSE and KEYSCAN signal as shown in Figure 2a, and pressing any key button on the keypad 210, by pressing the operation of the key switch on the key matrix 200, two signals KEYSENSE Analyzes and KEYSCAN to recognize the pressed key button. In addition, as shown in FIG. 2B, in order to recognize and process an arbitrary key press at an arbitrary time, the KEYSENSE is interrupted, and an internal interrupt is generated when any key is pressed. Therefore, when an arbitrary key button is pressed, an internal interrupt occurs, and the controller performs a procedure of checking the pressed key again by scanning again.

In the key matrix 200 of FIG. 2A and the corresponding keypad 210 and the key scan and interrupt circuit of FIG. 2B, the KEYSCAN signal and the KEYSENSE signal that are regularly scanned when any key button on the keypad 210 is pressed. The technique of recognizing a key pressed by a value is a well known technique.

Referring to the key matrix of FIG. 2A and the key scan and interrupt operations of the key scan and interrupt circuit of FIG. 2B configured as described above, the KEYSCAN6 outputs a logic 'LOW' pulse to enable the remaining KEYSCAN0-. At 5 it outputs a logic 'HIGH' pulse. Then, if there is a pressed key among the three keys corresponding to the first row among the 21 (= 7x3) keys, the KEYSENSE corresponding to the pressed key of KEYSENSE0-2 becomes logical 'low'. Therefore, in this state, if the states of KEYSCAN5-0 are sequentially read one by one, it is possible to know which key of any key is pressed.

Also, in Figure 2B, any logic (low key entered from any of KEYSCAN6-0 when k2i (i is the key at the position of any of 0-6 on KEYSENSE2 in Figure 2A)) is pressed. 'Makes KEYSENSE2 logical' low ', so the internal interrupt signal KEYSENSE_INT is activated from logic' high 'to' low '.

Therefore, when the mobile radio terminal is in the standby state, that is, when the key is pressed while the flip is closed, it does not appear to process the key in appearance, but in reality, the terminal is in an idle state in the sleep state by the interrupt signal KEYSENSE_INT. Is switched to. When the pressed key is checked and the flip is closed, the key value is ignored and the device goes back to sleep.

Therefore, the conventional key processing method has a problem in that the terminal performs key processing for key input even for unintentional key presses, thereby increasing battery consumption.

Accordingly, an object of the present invention is to automatically activate effective key presses of a mobile communication terminal, which minimizes the loss of battery capacity by preventing the mobile terminal from responding to momentary unintentional instantaneous key presses of the user so as to operate only valid key presses. A detection circuit and method are provided.

In order to achieve the above object, the present invention provides an effective keypress automatic detection circuit of a mobile communication terminal, wherein a transistor switch circuit of a resistor-capacitor (RC) delay circuit detects a keypress periodically forming an arbitrary key switch. A resistor connected to one side of the KEYSENSE signal port corresponding to the KEYSCAN signal port for reducing the power supply voltage and charging the capacitor when the power switch voltage is inputted, and the base terminal of the resistor and the transistor; A capacitor connected to one side thereof to ground and the other side grounded to charge a charge of a voltage drop in the supply voltage inputted through the resistor, and to apply a charged charge to a base terminal of a transistor when there is no input of the power supply voltage; The keyswitch is opened by being connected to the connection node of the capacitor. Characterized by when the supply voltage is not input, the capacitor is discharged, while all of the electric charge charged, made of an transistor for outputting a signal from the emitter terminal is INT_PU conduction by said discharge voltage signal.

In addition, the present invention for achieving the above object is a method for automatically detecting effective key presses of a mobile communication terminal, and determines whether the flip of the mobile communication terminal is closed, if the flip is closed, the mobile communication terminal sleeps only when there is a valid key input. Enabling the port of the mode control interrupt signal INT_UP to switch from mode to idle mode, disabling the internal interrupt signal KEYSENSE_INT, which is always active against keypresses in the key matrix, and then Switching the mode of the mobile communication terminal to the sleep mode; determining whether the key press time corresponding to the key input is longer than the RC delay time when there is a key input in the sleep mode; If key press is detected for a while, mode control interrupt signal INT_PU is generated. A process of switching to the IDLE mode, activating the KEYSENSE_INT signal, deactivating the mode control interrupt signal INT_PU, performing a corresponding function corresponding to the input key, and then performing a corresponding function. When the process is completed, the process of returning to the process of determining whether the flip is closed is characterized in that it is made.

1 is a block diagram of a mobile communication terminal to which the present invention is applied;

2a illustrates a key matrix structure according to the prior art;

2B is a view showing the structure of a key scan and interrupt circuit according to the prior art;

3 is a diagram illustrating a transistor switch circuit caused by a resistor-capacitor (RC) delay in an effective keypress automatic detection circuit of a mobile communication terminal according to an embodiment of the present invention;

4 is a control flowchart illustrating a valid key press automatic detection method of a mobile communication terminal according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations are omitted when it is determined that the detailed description may unnecessarily obscure the subject matter of the present invention.

1 is a block diagram of a mobile communication terminal to which the present invention is applied.

In FIG. 1, the control unit 10 controls the overall operation. The memory 20 is electrically programmable with a read only memory (ROM) for storing a predetermined operating program and a random access memory (RAM) for temporarily storing data generated during execution of the operating program. It consists of an Electrical Erasable Programmable Read Only Memory (EEPROM) that stores parameters and data set by the user.

The key input unit 30 is a user interface means. As shown in the keypad 210 of FIG. 2A, the key input unit 30 includes keys for selecting a menu or various functions, numeric keys for dialing, and the like. Is generated and output to the control unit 10. In the present invention, the three key buttons 212 shown in FIG. 2A are illustrated as an embodiment as key buttons to be used as effective key presses using an automatic detection circuit and method, but according to the setting of the KEYSENSE signal, A key can also be used, and can also be used as a key button corresponding to the effective key press by using a volume control key provided on the terminal.

The display unit 40 receives and displays display data corresponding to the key data input from the key input unit 30 from the control unit 10, and displays the operation state and a plurality of information of the mobile communication terminal as text and icons. The tone generator 70 generates a tone for a key input by the key input unit 30 under the control of the controller 10. The RF unit 50 modulates a radio signal received through the antenna ANT to an intermediate frequency, modulates a predetermined intermediate frequency into a radio signal, and transmits the radio signal through the antenna. The signal processing unit 60 processes the signal of the intermediate frequency input from the RF unit 50 into the original voice signal and outputs it to the speaker, encodes the voice signal input from the microphone (MIC), and then The signal is converted into a signal and output to the RF unit 50. In addition, the signal processor 60 outputs the tone generated by the tone generator 70 through the speaker SP.

3 is a diagram illustrating a transistor switch circuit caused by a resistor-capacitor (RC) delay in an effective keypress automatic detection circuit of a mobile communication terminal according to an embodiment of the present invention, and FIG. A control flow chart illustrating a valid key press automatic detection method of a mobile communication terminal. Hereinafter, the present invention will be described in detail with reference to FIGS. 1, 3, and 4.

In the effective method of automatically detecting key presses of the mobile communication terminal according to the present invention, first, the control unit 10 of FIG. 1 determines whether the flip of the mobile communication terminal is closed in step 100 of FIG. The controller 10 proceeds to step 102 if the flip is closed in step 100, and proceeds to step 122 if the flip is open. The controller 10 proceeds to step 102 to activate a port of the INT_PU, which is a mode control interrupt signal output from the emitter terminal of the transistor Q shown in FIG. 3. After activating the INT_PU port, the controller 10 proceeds to step 104 to deactivate the internal interrupt signal KEYSENSE_INT. Thereafter, the internal interrupt signal KEYSENSE_INT is not generated for a meaningless key input such as an unintended short key press except for a valid key input by the user.

The controller 10 switches to the sleep mode in step 106. In the sleep mode, only the basic call waiting function, time display, and basic screen display function are performed while the mobile terminal is closed. In the sleep mode of step 106, even if any key is pressed, the signal generated by pressing the key switch k2i is not applied to the KEYSENSE, but is applied to the transistor switch circuit 300 due to the RC delay as shown in FIG. . The applied signal is then charged in the capacitor C of the RC delay circuit so as not to generate any interrupts therein. At this time, the mobile communication terminal can be switched to the idle mode only by an external interrupt such as a flip open / close operation of the terminal or an incoming call.

The control unit 10 proceeds to the sleep mode in step 106 of FIG. 4 detects a key input in step 108 and proceeds to step 110. The controller 10 compares the key press time with the RC delay time by the RC delay circuit in step 110 and proceeds to step 112 when the key press time is longer. On the other hand, if the key press time is shorter than the RC delay time, that is, meaningless ??, the key input is ignored and the sleep mode of step 106 is maintained. The determination of steps 108 and 110 is a valid keypress automatic detection circuit, and in the present invention, the transistor switch circuit 300 by the RC delay of FIG. 3 is implemented in hardware.

In the effective keypress automatic detection circuit of the mobile communication terminal, the transistor switch circuit 300 by the RC delay circuit detects the keypress periodically, which constitutes any key switch k2i, i = 4, 5, 6; Connected to one side of the KEYSENSE signal port corresponding to the KEYSCAN signal port, and when the power switch is pressed by pressing the key switch k2i, i = 4, 5, 6, the power supply voltage is dropped to the capacitor C. One side is connected to a resistor (R) for charging the battery and a base terminal of the resistor (R) and the transistor, and the other side is grounded to charge the charge of the voltage drop of the supply voltage inputted through the resistor (R). If there is no input, the key switch (C) is connected to the connection of the capacitor (C), the capacitor (C), the resistor (R) and the capacitor (C) to apply charged charge to the base terminal of the transistor. k2i, i = 4,5,6 ) Is open and the power supply voltage is not input, while the capacitor C discharges all of the charged charges, the transistor C is turned on and outputs an INT_PU signal from the emitter terminal. .

In the present invention, the time constant determined by the resistor R and the capacitor C of the RC delay circuit as shown in FIG. 3 determines the keypress time for determining the effective keypress. That is, if there is a key press for a time longer than the delay time of the RC delay circuit, the arbitrary voltage switch (k2i, i = 4, 5, 6) is inputted to the capacitor C through the resistor R, and the voltage drop of the supply voltage. The capacitor C is provided with sufficient time to charge the electric charge of the capacitor C. Thus, after any key switch k2i, i = 4, 5, 6 is opened, it is charged by the capacitor C. The charge is applied to the base terminal of the transistor, and the transistor Q is conducted by the discharged signal while the capacitor C discharges all of the charged charge, thereby outputting the mode control interrupt signal INT_PU from the emitter terminal. .

On the other hand, if there is a key press for a time shorter than the key press time for determining the effective key press due to the time constant determined by the resistor R and the capacitor C of the RC delay circuit as shown in FIG. The capacitor C may be provided with sufficient time for the position k2i, i = 4, 5, 6 to charge the capacitor C with the charge of the voltage drop in the supply voltage inputted through the resistor R. There will be no. Thus, after any key switch k2i, i = 4, 5, 6 is opened, a reverse voltage is sufficient to allow the charge applied to the base terminal of the transistor to conduct the transistor Q by the discharge of the capacitor C. The control unit 10 does not generate the mode control interrupt signal INT_PU of the emitter terminal. In addition, no interruption is generated internally. Therefore, the mobile communication terminal does not respond to momentary unintentional momentary key presses of the user as intended in the present invention, so that it operates only on valid key presses. Provided is a valid keypress automatic detection circuit and method of a mobile communication terminal that minimizes losses.

According to a preferred embodiment of the present invention, it may be an RC delay circuit including a capacitor R having a resistance R of 1.2 mA and a capacitance of 1 mA. The transistor Q of the transistor switch circuit 300 due to the RC delay may use 2SA1579. Although the values of the respective preferred elements of the transistor switch circuit 300 due to the RC delay have been disclosed, this should only be understood as an embodiment of the present invention, and various modifications may be made without departing from the scope of the present invention.

If the key press time is longer than the RC delay time in step 110, the controller 10 proceeds to step 112 to generate the mode control interrupt signal INT_PU, and proceeds to step 114 to switch the mobile communication terminal to the idle mode. That is, a mode control interrupt signal INT_PU is generated by the valid key press, which causes the mode control interrupt signal INT_PU to switch the sleep mode of the terminal to the idle mode. Thereafter, the controller 10 proceeds from step 114 to step 116 to activate the KEYSENSE_INT signal so that all key buttons on the keypad 210 of FIG. 2A can be normally input.

The controller 10 deactivates the INT_PU signal in step 118 and proceeds to step 120 to perform a corresponding function corresponding to the input key. The controller 10 deactivates the INT_PU signal in step 118 to perform normal key input even if any key button on the keypad 210 is pressed for a longer time than the RC delay time. After the completion of the corresponding function, the controller 10 returns to the process of determining whether the flip of step 100 is closed.

Of course, when the flip of the mobile communication terminal is opened, the controller 10 proceeds to step 122 and performs a normal key button input process when there is a key input.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be defined by the claims and equivalents of the claims.

As described above, when the effective keypress automatic detection circuit and method of the mobile communication terminal according to the embodiment of the present invention are used, the mobile communication terminal does not react to the momentary unintentional instantaneous key press of the user so that only the effective key press is used. By operating, there is an advantage of minimizing the loss of meaningless battery capacity, that is, long battery life of the mobile communication terminal.

Claims (3)

In the effective key press automatic detection method of the mobile communication terminal, Determining whether the flip of the mobile communication terminal is closed and activating a port of a mode control interrupt signal for switching the sleep mode of the mobile communication terminal to an idle mode if the flip is closed; Activating a port of the mode control interrupt signal, and then deactivating an internal interrupt signal which is always activated with respect to the pressing of a key switch in a key matrix; Switching the mode of the mobile communication terminal to a sleep mode after deactivating the internal interrupt signal; Generating a mode control interrupt signal to a port of the mode control interrupt signal when there is a valid key press in the sleep mode; Switching the sleep mode to an idle mode by the mode control interrupt signal; Activating an internal interrupt signal after switching to the idle mode; Deactivating the mode control interrupt signal port; Performing a corresponding function corresponding to a key input in the idle mode; And automatically returning to the process of determining whether the flip is closed when the corresponding function is completed. The method of claim 1, If there is a valid key press in the sleep mode, generating a mode control interrupt signal to a port of the mode control interrupt signal may include determining whether the key press time is longer than a delay time of a resistor-capacitor delay circuit; And if the key is detected for a longer time than the delay time, generating the mode control interrupt signal to a port of the mode control interrupt signal. In the effective keypress automatic detection circuit of a mobile communication terminal, When the key switch is pressed and connected to one side of a key sense signal port corresponding to a key scan signal port for periodically detecting key presses constituting respective key switches in the key matrix of the mobile communication terminal, the key scan signal is inputted. A resistor for dropping the key scan signal to charge the capacitor to automatically detect the valid keypress; One side is connected to the resistor and the base terminal of the transistor, and the other side is grounded to charge the voltage-dropped key scan signal input through the resistor, and if no key scan signal is input, the charged charge is transferred to the base terminal of the transistor. The capacitor to be applied to, When the key switch is open and the key scan signal is not input when the key switch is connected to the connection node of the resistor and the capacitor, the capacitor is conducted by the discharge voltage signal while the capacitor discharges all the charged charge. A valid keypress automatic detection circuit for a mobile communication terminal, characterized by comprising a transistor switch circuit comprising a resistor-capacitor delay circuit comprising a transistor for outputting a mode control interrupt signal from a terminal.