公开(公告)号：US11561257B2

公开(公告)日：2023-01-24

申请号：US17130161

申请日：2020-12-22

Applicant: Allegro MicroSystems, LLC

Inventor： Ezequiel Rubinsztain ,  Pablo Javier Bolsinger

IPC: G01R31/3185 ,  G01R31/319 ,  G01R31/316 ,  G01R31/3167 ,  G01R31/3163

Abstract: A method for testing a signal path in a sensor, the signal path including a filter circuit and a comparator circuit, the method including: closing a first signal line that is arranged to bypass a first capacitor in the filter circuit; injecting a test signal into the signal path after the first signal line is closed; and detecting whether a signal that is output by the comparator circuit in response to the test signal satisfies a predetermined condition.

公开(公告)号：US10746814B2

公开(公告)日：2020-08-18

申请号：US16014075

申请日：2018-06-21

Applicant: Allegro MicroSystems, LLC

Inventor： Ezequiel Rubinsztain ,  Pablo Javier Bolsinger

IPC: G01R33/00 ,  G01R33/02 ,  G01R35/00

Abstract: Apparatus and methods provide an output signal indicative of a failure of a filter circuit and/or a Schmitt trigger circuit of a magnetic field sensor. A magnetic field sensor includes one or more magnetic field sensing elements that generate a magnetic field signal, a filter circuit that filters the magnetic field signal, a Schmitt trigger circuit that compares the filtered signal to a Schmitt trigger threshold during a first time period, and a diagnostic circuit coupled to the filter circuit that compares the Schmitt trigger threshold to a diagnostic threshold during a second time period that does not overlap with the first time period. An output signal indicative of a failure is output when the diagnostic threshold is greater than a predetermined percentage or absolute value above or below the Schmitt trigger threshold.

公开(公告)号：US10725122B2

公开(公告)日：2020-07-28

申请号：US16040716

申请日：2018-07-20

Applicant: Allegro MicroSystems, LLC

Inventor： Ezequiel Rubinsztain ,  Pablo Javier Bolsinger

IPC: G01R33/00 ,  G01R33/02 ,  G08B21/18

Abstract: A sensor includes an output circuit configured to generate a sensor output signal based on an input signal having a logic high or low level, as may be provided by a Schmitt trigger circuit. During normal operation, the output switches between a first percentage of the supply voltage for logic high and a second percentage of the supply voltage for logic low. To convey a failure at the output, an output signal is output as either ground or the supply voltage when a fault is detected. As such, a fault can be communicated any time the output voltage is not equal to the first percentage or the second percentage of the supply voltage.

公开(公告)号：US20190094313A1

公开(公告)日：2019-03-28

申请号：US15714067

申请日：2017-09-25

Applicant: Allegro MicroSystems, LLC

Inventor： Pablo Javier Bolsinger

IPC: G01R33/07 ,  G01B7/02 ,  G01R33/00 ,  G01R33/09 ,  H01L43/06

Abstract: A sensor is provided having a magnetic field sensing element to generate a magnetic field signal, a switching circuit coupled to receive the magnetic field signal and generate a switching signal that changes a polarity of the magnetic field signal at a predetermined frequency, and a comparison device configured to receive the switching signal and generate an output signal that changes a level in response to the switching signal crossing a predetermined threshold. The switching circuit is disposed between the magnetic field sensing element and the comparison device and can provide the comparison device an input signal (i.e., the switching signal) that changes polarity at the predetermined frequency. The comparison device can sense characteristics, such as but not limited to crossing operate and release threshold levels, of both north and south polarity magnetic field signals using the switching signal.

公开(公告)号：US20150268312A1

公开(公告)日：2015-09-24

申请号：US14661042

申请日：2015-03-18

Applicant: Allegro MicroSystems, LLC

Inventor： Manuel Rivas ,  Juan Manuel Cesaretti ,  Pablo Javier Bolsinger

IPC: G01R33/00 ,  G01R33/07 ,  G01R33/09 ,  H03K5/125

CPC classification number: G01R33/0023 ,  G01R33/07 ,  G01R33/09 ,  H03K5/125

Abstract: An electronic comparison circuit can identify at least three conditions of an input signal received by the electronic comparison circuit. A first one of the at least three conditions occurs when a value of the input signal is less than a first threshold value, a second one of the at least three conditions occurs when a value of the input signal is greater than the first threshold value and less than a second threshold value, and a third one of the at least three conditions occurs when a value of the input signal is greater than the second threshold value. A magnetic field sensor can use the electronic comparison circuit.

Abstract translation: 电子比较电路可以识别由电子比较电路接收的输入信号的至少三个条件。 当输入信号的值小于第一阈值时，发生至少三个条件中的第一个，当输入信号的值大于第一阈值时，发生至少三个条件中的第二个条件，并且 小于第二阈值，并且当输入信号的值大于第二阈值时，发生至少三个条件中的第三条件。 磁场传感器可以使用电子比较电路。