Magnetic sensor circuit
AssigneeSii Semiconductor Corporation
InventorMasao IRIGUCHI
Life of this patent
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Abstract
To provide a magnetic sensor circuit which does not output spike-like voltage errors to a signal processing circuit. A magnetic sensor circuit is provided which is configured so as to output an output signal to a signal processing circuit through a plurality of hall elements driven by a first switch circuit and a second switch circuit controlled by a second control circuit and in which the first switch circuit controls timings at which spikes occur in the output signal of each of the hall elements in such a manner that the timings are not the same, and the second switch circuit selects and outputs an output signal having a period of a timing free of the occurrence of a spike.
Claims4
A magnetic sensor circuit comprising:
- a plurality of hall elements equipped with a plurality of terminals;
- a first switch circuit which is provided between the terminals of the hall elements, and a power supply terminal and a ground terminal and supplies driving currents to the hall elements by switching;
- a second switch circuit which is connected to the terminals of the hall elements and selects and outputs output signals of the hall elements;
- a first control circuit which outputs a first control signal to the first switch circuit;
- a second control circuit which outputs a second control signal to the second switch circuit;
- and
- a signal processing circuit which performs signal processing in response to the output signal outputted from the second switch circuit,
- wherein the first control circuit controls the hall elements in such a manner that timings at which spikes occur in the output signals of the hall elements become different from each other,
- wherein the second control circuit controls the second switch circuit in such a manner that the second switch circuit does not select the output signal having a predetermined period during which spikes occur, out of the output signals of the hall elements, and selects the output signal having a predetermined period free of the occurrence of spikes out of the output signals of the hall elements, and
- wherein at least one output signal of either of the hall elements is selected and outputted during all periods as the output of the second switch circuit.
Dependencies are inferred from the claim text.