KR101059841B1 - Signal delay circuit device for automatic power on in mobile communication terminal - Google Patents

Abstract

The present invention relates to a signal delay circuit device for automatic power-on in a mobile communication terminal. When high is applied to a power supply (DC voltage) and an allocation pin on an interface connector, the power supply is applied to the DC voltage. A capacitor which rises with a delay of a predetermined time until and the transistor is turned on by using the drain voltage VDD as the drain power when the power source rises to the DC voltage Characterized in that it includes, when designing an external device that requires automatic power on (Auto power on) without the need to additionally configure the circuitry, only a high (high) applied to the pin assigned to the interface connector, that is, AUTO_ON signal, the terminal There is no need to insert an additional delay integrated circuit (IC) inside, and adjust the delay value by changing the capacitor and resistance values in the delay circuit. It has the advantage that you can.

Terminal, signal delay circuit, delay circuit, automatic power-on

Description

SIGNAL DELAY CIRCUIT APPARATUS FOR AUTO-POWER-ON IN PORTABLE COMMUNICATION TERMINAL}

1 is a diagram illustrating a configuration of a mobile communication terminal in which a signal delay circuit is inserted according to the present invention;

2 illustrates a signal delay circuit for automatic power-on in a mobile communication terminal according to the present invention;

3 is a diagram illustrating a PSPICE simulation result for a delay circuit in a mobile communication terminal according to the present invention.

The present invention relates to a mobile communication terminal, and more particularly, to a signal delay circuit device for automatic power on.

In a terminal that is not turned on unless the power key is operated, it is often necessary to automatically power on the terminal by specific conditions such as a terminal production process, HFK, DTC, and the like.

Conventionally, in order to automatically power on a terminal, an external device intended for auto power on is inserted into an interface connector of the terminal, and a specific pin of the connector is inserted. ) Is configured to automatically turn on the terminal according to the state of the pin (pin). In this case, when the power of the terminal is not turned on, only the state of the pin does not turn on automatically, but the state of high to low or low to high is high. Change is needed. In this case, an edge trigger is required to change the state of the pin, and a signal delay circuit is inserted for this purpose.

In the conventional signal delay circuit, a complex circuit is configured in an external device intended for auto power on, and a delay is generated, or a delay is generated in the terminal using an RC delay circuit.

When a signal delay circuit is inserted into an external device intended for auto power on, the signal delay circuit is changed according to whether a separate power is applied to the external device. In addition, in the case of an external device to which power is applied, there is a problem in that the complexity of the signal delay circuit itself increases according to the order of insertion of the terminal connector and power supply of the external device itself.

In addition, when a simple RC delay circuit is inserted into the terminal, the RC delay circuit is composed of a resistor and a capacitor, and generates a signal delay by charging / discharging a signal input through the resistor to a capacitor. . However, there is a problem that the auto power on may fail due to various conditions such as the time of power supply of an external device or the state of capacitor charge / discharge in an internal circuit.

An object of the present invention is to provide a signal delay circuit device for automatic power on in a mobile communication terminal.

Still another object of the present invention is to provide an apparatus for auto power on without failure by inserting only a minimum circuit into a mobile communication terminal.

According to an embodiment of the present invention to achieve the above object, the signal delay circuit device for automatic power-on, when high is applied to the power supply (DC voltage) and the allocation pin (pin) on the interface connector, A capacitor which raises the power supply to the DC voltage with a predetermined time delay, and when the power supply is raised to the DC voltage, the power supply and the drain voltage VDD passed through the capacitor are turned on using the drain power supply ( It characterized in that it comprises a transistor that is turned on).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, a description will be given of a signal delay circuit device for automatic power-on in a mobile communication terminal.

1 is a diagram illustrating a configuration of a mobile communication terminal in which a signal delay circuit is inserted according to the present invention. In the following description, the mobile communication terminal is a cellular phone, a personal communication system (PCS), a personal digital assistant (PDA), an IMT-2000 (International Mobile Telecommunication-2000) terminal, or the like. It is meant to include all, the following description will be described with a general configuration of the above examples. Here, the mobile communication terminal in addition to the conventional configuration in accordance with the present invention PMIC (Power Management IC) 101, the delay circuit 103, the interface connector 105, the terminal internal guitar circuit 107 It further includes.

Referring to FIG. 1, a controller (MPU) of the mobile communication terminal 101 controls the overall operation of the mobile communication terminal. For example, a function for performing processing and control for voice communication and data communication, and automatically powering on the terminal using the delay circuit 115 according to the present invention in addition to the usual functions. To process. In other words, a function for auto power on is processed according to the power applied from the PMIC 113. Therefore, in the following description, description regarding the processing and control of the normal control unit 101 is omitted.

The memory 103 may be composed of a ROM, a RAM, and a flash ROM. The ROM (ROM: Read Only Memory) stores a microcode and various reference data of a program for processing and control of the controller 101. In particular, according to the present invention stores a program for automatically powering on the terminal using a delay circuit. The random access memory (RAM) is a working memory of the controller 101, and stores temporary data generated during execution of various programs. The flash ROM stores various updatable storage data such as document data.

The key input unit 105 includes 0 to 9 numeric key buttons, a menu button (menu), a cancel button (clear), an OK button, a call button (TALK), an end button (END), an internet access button, a navigation key ( Or a plurality of function keys such as arrow keys, buttons (▲ / ▼ / ◀ / ▶), and provide key input data corresponding to a key pressed by the user to the controller 101. The display unit 107 displays status information generated during the operation of the portable terminal, a limited number of characters, a large amount of moving images and still images, and the like. The display unit 107 may use a color liquid crystal display (LCD).

The voice processing unit 109 connected to the control unit 101 and the speaker and microphone connected to the voice processing unit 109 are voice input / output blocks used for telephony communication and voice recording. The voice processing unit 109 converts the digital data provided from the control unit 101 into an analog voice signal and transmits it through the speaker, and converts the voice signal received through the microphone into digital data to control the control unit 101. To provide.

In addition, the communication unit 111 performs a function of transmitting and receiving a radio signal input and output through the antenna. For example, in the case of transmission, after channel coding and spreading data to be transmitted, RF (Radio Frequency) processing is performed, and in the case of reception, the received RF signal is baseband. It performs a function of restoring data by despreading and channel decoding.

The PMIC (Power Management IC) 113 receives an external device recognition signal nEX_ON from the delay circuit 115, and after the power supply (DC Voltage) of the terminal is applied, receives the external device recognition signal. When a state change from high to low is detected, power is supplied to the controller 101 to automatically power on the terminal.

The delay circuit 115 receives an AUTO_ON signal from a power supply (DC Voltage) and an interface connector 117, and when the power supply and the AUTO_ON signal are changed from low to high, the PMIC 113. The high state of the external device recognition signal nEX_ON input to is delayed for a predetermined time to change to a low state. In other words, when the power and AUTO_ON signals are changed from low to high, the external device recognition signal becomes high with a slight curve and then the capacitor C1 and the resistor R2. Drop to Low with a delay according to the value.

The interface connector 117 assigns a specific pin (hereinafter referred to as AUTO_ON) so that the delay circuit 115 is detected when an insertion of an external device intended to auto power on is detected. A high level is applied to the AUTO_ON signal inputted through).

2 is a diagram illustrating a signal delay circuit for automatic power on in a mobile communication terminal according to the present invention. Herein, the allocation pin (hereinafter referred to as AUTO-ON) on an interface connector has a high state for the auto power on, and the external device recognition signal ( NEX_ON hereinafter) should have a state change from high to low.

Here, the signal delay circuit, when high is applied to the power supply (DC voltage) 201 and the allocation pin (206) on the interface connector 117, the power supply 201 to the DC voltage A capacitor 202 that rises with a delay of a predetermined time until the power supply 201 rises to the DC voltage, and the power supply 201 and the predetermined resistance 3 204 that have passed through the capacitor 202 The transistor 208 is turned on using the passed drain voltage VDD 203 as a drain power source. Here, the transistor 208 has a delay according to the value of the resistor 2 (209) of the capacitor 202 and the source terminal, and the voltage applied to the assignment pin (AUTO_ON) on the interface connector has a predetermined resistance of 1 (207). It passes through and is input to the gate voltage of the transistor 208.

Referring to FIG. 2, when an external device intended for auto power on is inserted while the power supply (DC voltage) 201 and the VDD 203 in the terminal are turned off, the delay circuit is inserted. The power supply (DC voltage) 201 input to the 200 and the AUTO-ON signal 206 from the interface connector 117 are simultaneously applied high. At this time, the power (DC voltage) input to the external device recognition signal (nEX_ON) 205 is increased to the DC voltage while drawing a slight curve by the DC blocking capacitor 1 (C1) 202. Here, the VDD 203 passes through the resistor 3 (R3) 204 and outputs the external device recognition signal 205.

Thereafter, when the power source rises to the DC voltage, transistor 1 (TR1) 208 is turned on, so that current flows from the drain of the transistor 230 to the source. . Here, R1 207 is set to a value capable of sufficiently turning on the transistor 1 208. The current flowing from the drain to the source may vary depending on the values of the capacitor 1 (C1) 202 and the resistor 2 (R2) 209. Accordingly, the voltage output to the external device recognition signal 205 has a delay of τ by the capacitor 1 202 and the resistor 2 209, that is, C1 × R2, and the DC voltage, that is, high ( Fall from high to low. At this time, the PMIC (Power Management IC) 113 detects a state change from the high to the low of the external device recognition signal 205 and automatically transmits it to the controller 101 of the terminal. Apply power for power on. Therefore, the delay value may be adjusted by changing the values of the capacitor 1 202 and the resistor 2 209. For example, in the case of the delay circuit applying the values of the capacitor 1 (C1) and the resistor 2 (R2) to a value of 1 uF and 470 ohm, the delay value τ, that is, C1 × R2 is 470usec.

3 is a diagram illustrating a PSPICE simulation result of a delay circuit in a mobile communication terminal according to the present invention. Referring to FIG. 3, the power supply (DC voltage) 301 is increased to the DC voltage while drawing a slight curve by the capacitor (C1) 202 inside the terminal. At this time, the voltage input to the external device recognition signal 303 rises by the DC voltage while drawing a slight curve, and then delays according to the values of the capacitor 202 and the resistor 209 included in the delay circuit. ) And drop into Low.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

An object of the present invention is to automatically turn on the power through a simple signal delay circuit in a mobile communication terminal, so that no additional circuit is required when designing an external device requiring automatic power on. It is advantageous to apply only high to the assignment pin on the interface connector, that is, the AUTO_ON signal. In addition, there is no need to insert an additional delay integrated circuit (delay IC) in the terminal, there is an advantage that the delay value can be adjusted by changing the value of the capacitor and the resistance in the delay circuit.

Claims (4)

A signal delay circuit device for automatic power on in a mobile communication terminal, A capacitor that raises the power supply with a delay of a predetermined time to the DC voltage when high is applied to a power supply (DC voltage) and an allocation pin on an interface connector; And a transistor turned on using the power source and the drain voltage (VDD) that pass through the capacitor as a drain power source when the power source is raised to the DC voltage. The method of claim 1, The DC pin and an assignment pin on the interface connector apply high by inserting an external device intended for automatic power on. The method of claim 1, And the transistor has a delay depending on the resistance of the capacitor and the source terminal. The method of claim 1, And the signal delay circuit device outputs the voltage at the capacitor output terminal as an external device recognition signal (nEX_ON).

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