SWITCH INPUT CIRCUIT,申请号JP19990236034-传众专利搜索

SWITCH INPUT CIRCUIT

申请公布号：JP2001060857(A)

申请号：JP19990236034

申请日期：1999.08.23

申请公布日期：2001.03.06

申请人：

DENSO CORP

发明人：HAYASHI HIDEAKI;KOJIMA TOSHIMI

分类号：H03K17/00;(IPC1-7):H03K17/00

主分类号：H03K17/00

摘要：PROBLEM TO BE SOLVED: To reliably transmit a plurality of switch inputs with one signal line even when a power supply voltage changes. SOLUTION: Four input terminals 3 to 6 are connected to switches 8 and 9, and each of the terminals 3 to 6 is grounded by turning on the switches 8 and 9. Four Zener diodes D1 to D4 having a different Zener voltage are provided respectively between a battery power supply line (+B) and each of the terminals 3 to 6. A battery voltage being equal to or more than the Zener voltage is applied to the diodes D1 to D4. The diodes D1 to D4 are connected to an output terminal 7, and potential on a power supply side in the diodes D1 to D4 is outputted as a signal corresponding to the states of each of the switches 8 and 9 from the terminal 7.