| 摘要 |
PURPOSE: A circuit for sensing a key input signal of a mobile communication terminal is provided to improve the efficiency of the key number recognizable with the equal signal line and ports of a CPU by using a three-dimensional matrix structure, thereby reducing signal lines and ports of electric appliances including the mobile communication terminal. CONSTITUTION: In a circuit for sensing a key input signal of a mobile communication terminal, two-dimensional matrices are made of a plurality of signal lines(1-8) and three-dimensional matrices are made of the rest signal line(9) by using X, Y, Z. The level of each pulled up signal is converted by switches(SW31-SW62) and the corresponding key signal is sensed by discriminating the converted signals.
|
