Patent ID: 8093879
Filing Date: 2012-01-10
Classification: H02M

Abstract:
1. A semiconductor circuit comprising: a first terminal section to be connected to a connection point between two external resistors which are connected in series; a second terminal section to be connected to an input terminal of an external circuit; a voltage circuit section having a first terminal connected to the second terminal section; a reference voltage circuit section which outputs a predetermined voltage; an operational amplifier having a first input terminal connected to the reference voltage circuit section, a second input terminal connected to the first terminal section, and an output terminal connected to a second terminal of the voltage circuit section; an abnormality detecting circuit which detects an abnormal voltage of the first terminal section; a normal signal generating unit which generates a normal signal; and a switching circuit which, when the abnormality detecting circuit detects an abnormal voltage, does not output a voltage based on the first terminal section to the second terminal section and instead outputs a normal voltage based on the normal signal to the second terminal section.