Driving device

Abstract

Abstract PURPOSE:To save number of load drive lines by providing plural series circuits consisting each of a current limit resistor, a load having directinality in the drive voltage and a switch and connecting a connecting point between the resistor and the load and to a connecting point between the load and the switch of the other series circuit. CONSTITUTION:Series circuits each comprising current limit resistors 2, 3, 4, light emitting diodes 15, 16, 17 being direction load connected to them, and switches 8, 9, 10 are provided between a power supply and a common, and a connecting point between the resistor 2 and the load 15 and a connecting point between the load 16 and the switch 9 are connected, and a connecting point between the resistor 3 and the load 16 and a connecting point between the load 15 and the switch 8 are connected respectively. When the level of a terminal A of a microcomputer 1 is logical 1 and a terminal B is logical 0, the switch 8 is closed, the load 15 is lighted, a reverse bias is given to an anode voltage of the load 15 to the cathode of the load 16 to prevent the load 16 from lighting. When the level of the terminal A is logical 0 and the level of the terminal B is logical 1, the load 16 is lighted similarly. When the level of the terminals A, B is logical 1, the load 17 is lighted via an AND circuit 13. In this case, the anode of the loads 15, 16 is connected to common at the switches 9, 8 and the loads are not lighted.

Inventors

• 👤 Yuji Deguchi
• 👤 出口　裕司

Bibliographic Details