Magnetic sensor and magnetic sensor device
Provided are a magnetic sensor, which is capable of accurately determining abnormalities, such as disconnection and a short circuit, of wiring of a magnetic sensor device, and the magnetic sensor device. An output control circuit of the magnetic sensor includes a voltage divider circuit, which is connected to an output terminal of the magnetic sensor, and an amplifier, which is configured to control a gate voltage of a MOS transistor, which is connected to the output terminal of the magnetic sensor, so that a voltage of the voltage divider circuit and a reference voltage become equal to each other, with the result that an output voltage of the magnetic sensor is determined by the reference voltage and a voltage dividing ratio of the voltage divider circuit.
1. A magnetic sensor, which has an output terminal connected to an input terminal of a discrimination circuit, and to an external power supply terminal via a pull-up resistor, the magnetic sensor comprising:
a magnetic sensor element;
a determination circuit, to which an output voltage of the magnetic sensor element is input; and
an output control circuit, which is configured to output a signal from the determination circuit to the output terminal of the magnetic sensor,
the output control circuit comprising:
a first resistor and a second resistor, which are connected in series between the output terminal of the magnetic sensor and a ground terminal;
an amplifier, which has a non-inverting input terminal connected to a node between the first resistor and the second resistor;
a switch, which has a control terminal connected to an output terminal of the determination circuit, a first input terminal connected to a first reference voltage circuit, a second input terminal connected to a second reference voltage circuit, and an output terminal connected to an inverting input terminal of the amplifier; and
a MOS transistor, which has a gate connected to the output terminal of the amplifier, a drain connected to the output terminal of the magnetic sensor, and a source connected to the ground terminal.
2. A magnetic sensor device, comprising:
the magnetic sensor of claim 1 ;
a discrimination circuit, which has an input terminal connected to the output terminal of the magnetic sensor; and
a pull-up resistor, which is connected between the output terminal of the magnetic sensor and an external power supply terminal.