KR20050055455A - Keypad circuit of mobile communication terminal - Google Patents

Abstract

The present invention relates to a keypad circuit of a mobile communication terminal that can reduce current consumption by separating a power key and a menu exit key, and directly connects a switch for a power key that performs a power on / off function to a battery. In addition, it is preferable to separately configure the power key and the menu end key by adding a switch for a menu end key that performs a menu end function separately from the power key on a key matrix.

In the present invention, the power key is directly connected to the battery, and by implementing the menu end key on the key matrix separately from the power key, it is possible to reduce the current consumption of the menu end key, thereby increasing the battery usage time. In addition, by separately configuring the power key and the menu exit key, it is possible to reduce the power-off phenomenon due to user carelessness.

Description

KEYPAD CIRCUIT OF MOBILE COMMUNICATION TERMINAL}

The present invention relates to a keypad circuit of a mobile communication terminal, and more particularly, to a keypad circuit of a mobile communication terminal that can reduce current consumption by separating a power key and a menu end key.

In general, a keypad of a mobile communication terminal is provided with a power key used to turn on / off a power and a menu end key used to terminate a menu. Conventionally, as shown in FIG. 1, an MSM (Mobile Station) called ON_SW_SEN / is used. Modem) 's General Purpose Input Output (GPIO) pin is used to turn the power on and off and to exit the menu via a single key.

2 is a road, menu exit key and power key, which exemplarily illustrate a keypad configuration of a conventional mobile communication terminal, are integrated into one key 5. Accordingly, it is necessary to distinguish whether the corresponding key input is a menu end key input or a power key input, which is distinguished by an input time of the corresponding key. That is, if the corresponding key is pressed for a long time, the corresponding key is recognized as the power key to turn on / off the power, and if the corresponding key is pressed shortly, the corresponding key is recognized as the menu exit key to terminate the menu.

As described above, when the power key and the menu exit key are implemented with one key, the ON-SW signal is directly connected to the battery power, and thus, the menu is terminated after the power is turned on to the mobile terminal. Whenever the key is pressed, the menu exit key directly connected to the battery has a problem in that current consumption is increased compared to other menu keys according to Ohm's law, in which the current increases as the voltage increases.

In addition, since the corresponding key is recognized as the power key and the menu end key based on the input time of the corresponding key, there is a problem that a power-off may occur when the user wants to exit the menu due to an operation error of the terminal user.

The present invention has been made to solve the above-described problem, the power key is connected directly to the battery, and by implementing the menu exit key on the key matrix separately from the power key, to reduce the current consumption in the menu exit key It is an object of the present invention to provide a keypad circuit of a mobile communication terminal.

Key path circuit of a mobile communication terminal according to an embodiment of the present invention for achieving the above object, by directly connecting the switch for the power key to perform the power on / off function to the battery, and separately from the power key It is preferable to separately configure the power key and the menu end key by adding a switch for a menu end key for performing a menu end function on the key matrix.

Hereinafter, a keypad circuit of a mobile communication terminal according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a road showing an exemplary configuration of a keypad circuit of a mobile communication terminal according to an embodiment of the present invention, a switch 10 for a power key used for on / off of a power supply is directly connected to a battery, and Use only as a function to turn on / off.

Then, the switch 20 for the menu end key used for the end of the menu is added to the key matrix separately from the power key, and used only as a function for terminating the menu.

As described above, since the menu exit key is implemented on the key matrix and the input of the menu exit key is detected by the MSM through the key input detection (KEY_SEN), the current consumption in the menu exit key is the same as that of other menu keys. do.

4 is a road, a power key 15 and a menu end key 25, each of which illustrates a keypad configuration of a mobile communication terminal according to the keypad circuit configuration of the present invention.

As described above, by separately configuring the power key 15 and the menu end key 25 into separate keys, the terminal user presses only the power key 15 to turn on / off the power, and to exit the menu. Only the end key 25 is pressed.

Accordingly, unless the terminal user presses the power key 15 instead of the menu end key 25 to end the menu, it is possible to eliminate the phenomenon of power off when the user wants to exit the menu.

The keypad circuit of the mobile communication terminal of the present invention is not limited to the above-described embodiment, and can be modified in various ways within the scope of the technical idea of the present invention.

According to the keypad circuit of the mobile communication terminal of the present invention as described above, the power key is connected directly to the battery, and by implementing the menu exit key on the key matrix separately from the power key, to reduce the current consumption at the menu exit key It is possible to increase the battery life. In addition, by separately configuring the power key and the menu exit key, it is possible to reduce the power-off phenomenon due to user carelessness.

1 is a view showing an exemplary configuration of a keypad circuit of a conventional mobile communication terminal.

2 is a diagram illustrating a keypad configuration of a conventional mobile communication terminal by way of example.

3 is a diagram illustrating a configuration of a keypad circuit of a mobile communication terminal according to an embodiment of the present invention.

4 is a diagram illustrating a keypad configuration of a mobile communication terminal according to the keypad circuit configuration of the present invention by way of example.

*** Explanation of symbols for the main parts of the drawing ***

10. Switch to power key, 15, Power key,

20. Switch to menu exit key, 25. Menu exit key

Claims (1)

The switch for the power key to perform the power on / off function is directly connected to the battery, and a new switch for the menu exit key for performing a menu exit function separately from the power key is added on the key matrix, A keypad circuit of a mobile communication terminal that separates the menu exit key.