| 摘要 |
PURPOSE:To enable the realization of two different additional control functions using one input terminal by providing one input terminal and the first and the second input circuits which have each different control function in an input switching circuit. CONSTITUTION:If a high level is applied to an input terminal 1, the level of the input terminal 1 is transferred to the input signal IN1 of the first function and a node N5 is made the high level. If the resistance of a high resistance R3 is set to a value which can neglect a voltage drop, a transistor Q3 is made ON. If the resistance ratio of a high resistance R1 and the ON resistance of the transistor Q3 is appropriately set, a node N4 is made a low level and a transistor Q2 is made OFF, an input signal IN2 is clamped to a low level with a high resistance R2, only the first function is made action and the second function is stopped. If the signal to the input terminal 1 is made high or low blowing a fuse element 3 applying negative voltage to the input terminal 1, the second function can be controlled. |
