| 摘要 |
PROBLEM TO BE SOLVED: To provide an interface circuit for switch signal input capable of responding to many kinds of switch input by simplified and commonized circuit structure. SOLUTION: The optimal constant current is switched and supplied to a switch signal input terminal Te according to a use current range of a resistance value variation type switch SWr connected to the switch signal input terminal Te of the interface circuit 1 for switch signal input. In addition, when a current value variation type switch SWi is connected, current supply capability larger than an absorption current value of the current value variation type switch SWi is provided from a switch power feeding circuit part 2. COPYRIGHT: (C)2008,JPO&INPIT
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