US 2019/0195661 A1Published application

Magnetic sensor, semiconductor device, and electric device

AssigneeRohm Co., Ltd.

InventorTatsuya MANO

Life of this patent

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Abstract

A magnetic sensor detects presence or absence of a magnetic field and its polarity. South pole and north pole magnetic fields are respectively detected by the south pole detection operation and the north pole detection operation. A signal processing circuit of the magnetic sensor performs a unit operation including at least one of the south pole detection operation and the north pole detection operation repeatedly at an interval. In this case, if the south pole is detected in the i-th unit operation, the south pole detection operation is performed first in the (i+1)th unit operation. If the south pole is detected in the south pole detection operation, the north pole detection operation is not performed in the unit operation. If the north pole is detected in the i-th unit operation, operations are performed oppositely to the above.

Claims17

Dependent claims

A magnetic sensor comprising:

a magnetoelectric conversion element arranged to output a signal corresponding to an applied magnetic field;
and
a signal processing circuit including a detection circuit and a control circuit, the detection circuit being capable of distinguishing and detecting a magnetic field having a first polarity and a magnetic field having a second polarity opposite to the first polarity by using an output signal of the magnetoelectric conversion element, the control circuit being arranged to control the detection circuit to perform a first detection operation to detect the magnetic field having the first polarity and a second detection operation to detect the magnetic field having the second polarity, wherein
the signal processing circuit performs a unit operation repeatedly at an interval, the unit operation including at least one of the first detection operation and the second detection operation, and controls content of (i+1)th unit operation in accordance with a detection result of the magnetic field in i-th unit operation (i is a natural number).

1 more element

A magnetic sensor comprising:

a magnetoelectric conversion element arranged to output a signal corresponding to an applied magnetic field;
and
a signal processing circuit including a detection circuit and a control circuit, the detection circuit being capable of distinguishing and detecting a magnetic field having a first polarity and a magnetic field having a second polarity opposite to the first polarity by using an output signal of the magnetoelectric conversion element, the control circuit being arranged to control the detection circuit to perform a first detection operation to detect the magnetic field having the first polarity and a second detection operation to detect the magnetic field having the second polarity, wherein
the signal processing circuit performs a unit operation repeatedly at an interval, the unit operation including at least one of the first detection operation and the second detection operation, and performs one detection operation out of the first detection operation and the second detection operation without first performing the other detection operation in each unit operation, and if a magnetic field having the corresponding polarity is detected, the signal processing circuit does not perform the other detection operation in the unit operation.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 16/224,152Filed 18 Dec 2018
Priority: JP 201724632522 Dec 2017
Published: 27 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01D 5/24476
Error correction: signal processing
G01D 5/145
Using Hall-effect devices: influenced by the relative movement between the Hall device and magnetic fields
G01R 33/06
Measuring direction or magnitude of magnetic fields or magnetic flux: using galvano-magnetic devices
G01R 33/072
Hall effect devices: constructional adaptation of the sensor to specific applications