| 摘要 |
<P>PROBLEM TO BE SOLVED: To identify a defective switch from a plurality of power supply switches that control power supply to a power supply separation circuit. <P>SOLUTION: A power supply switch group 21 comprises a plurality of power supply switches 120 to 122 that control connection between a first power supply 101 and a plurality of power supply terminals 103 to 105. A power supply separation circuit 11 comprises a plurality of internal circuits 140 to 142 connected so as to correspond to each of the plurality of power supply terminals 103 to 105. Switching elements 131 and 132 short-circuit between the plurality of power supply terminals 103 to 105 in a normal operation mode; and performs separation between the plurality of power supply terminals 103 to 105 in a test mode. Voltages VSD in the plurality of power supply terminals 103 to 105 are output to a plurality of monitor terminals 161 to 163 so that they can be monitored. <P>COPYRIGHT: (C)2012,JPO&INPIT |
