INTEGRATED CIRCUIT FOR CONTACTLESS DETECTION SWITCH

摘要

PURPOSE:To select freely the current consumption and operating speed by providing a switching circuit for the operating current of a detection circuit subject to circuit integration. CONSTITUTION:The detection circuit 2 gives a pulse signal from an internal pulse generating circuit to a base of a transistor (TR) 6 via a terminal 108. The TR 6 receives a power voltage from a power terminal 103 and gives a projected light pulse current to an LED 8 in response to the pulse from the detection circuit 2. The light of the LED 8 is received by a photo TR 10, and the photodetection signal from the photo TR 10 is inputted to the detection circuit 2. The detection circuit 2 discriminates whether or not a path between the LED 8 and the photo TR 10 is shut by something. When both terminals 106 and 107 are connected to a current consumption switching circuit 11, an injector current of the TR is increased to attain high speed operation of the detection circuit 2.