公开(公告)号：US11275127B2

公开(公告)日：2022-03-15

申请号：US16715492

申请日：2019-12-16

Applicant: Allegro MicroSystems, LLC

Inventor： Jay M. Towne ,  Peter Tengstrand ,  Devon Fernandez

IPC: G01R33/00 ,  G01R35/00 ,  G01R33/02 ,  H03M3/00

Abstract: According to aspects of the disclosure, an apparatus is disclosed comprising: a controller; an analog-to-digital converter (ADC) coupled to the controller, the ADC including an input terminal for receiving a sensor signal from a transducer; and a diagnostic circuit coupled to the input terminal of the ADC and to the controller, the diagnostic circuit being configured to: generate a diagnostic signal that indicates whether a voltage at the input terminal of the ADC meets a first threshold, and provide the diagnostic signal to the controller, wherein the controller is configured to: receive a data sample from the ADC, detect whether the data sample meets a second threshold, and transition the apparatus into a safe state when: (i) the diagnostic signal indicates that the voltage at the input terminal does not meet the first threshold, and (ii) the data sample meets the second threshold.

公开(公告)号：US10782363B2

公开(公告)日：2020-09-22

申请号：US15816045

申请日：2017-11-17

Applicant: Allegro MicroSystems, LLC

Inventor： P. Karl Scheller ,  James E. Burgess ,  Steven E. Snyder ,  Kristann L. Moody ,  Devon Fernandez ,  Andrea Foletto

IPC: G01R33/00 ,  G01D5/244 ,  G01P3/487 ,  G01P3/488 ,  G01P21/02 ,  G01R23/00 ,  G01P3/44 ,  G01P13/00 ,  G01R33/06

Abstract: Systems, methods, and apparatuses for magnetic field sensors with self-test include a detection circuit to detect speed and direction of a target. One or more circuits to test accuracy of the detected speed and direction may be included. One or more circuits to test accuracy of an oscillator may also be included. One or more circuits to test the accuracy of an analog-to-digital converter may also be included. Additionally, one or more IDDQ and/or built-in-self test (BIST) circuits may be included.

公开(公告)号：US10712403B2

公开(公告)日：2020-07-14

申请号：US15624898

申请日：2017-06-16

Applicant: Allegro MicroSystems, LLC

Inventor： Mathew Drouin ,  Devon Fernandez ,  Jay M. Towne ,  Alejandro Gabriel Milesi

IPC: G01R33/09 ,  G01R33/00 ,  G01R33/028

Abstract: Electronic circuits used in magnetic field sensors use transistors for passing a current through the transistors and also through a magnetoresistance element.

公开(公告)号：US10216559B2

公开(公告)日：2019-02-26

申请号：US15350400

申请日：2016-11-14

Applicant: Allegro MicroSystems, LLC

Inventor： Devon Fernandez

IPC: G06F11/00 ,  G06F11/07 ,  G01R33/00 ,  G01R33/06 ,  G01R33/07 ,  G01R31/28 ,  G01R31/44 ,  B60R16/023

Abstract: Described embodiments provide circuits, systems and methods for detecting and communicating fault conditions. In an embodiment, an integrated circuit includes a fault detector to detect a fault condition of the integrated circuit and a controller to generate output data of the integrated circuit. An output generator generates an output signal of the integrated circuit. The output signal is generated at a first set of output levels based upon the output data when the fault detector does not detect the fault condition, and the output signal is generated at a second set of output levels based upon the output data when the fault detector detects the fault condition.

公开(公告)号：US20180136999A1

公开(公告)日：2018-05-17

申请号：US15350400

申请日：2016-11-14

Applicant: Allegro MicroSystems, LLC

Inventor： Devon Fernandez

IPC: G06F11/07

CPC classification number: G06F11/0739 ,  B60R16/0232 ,  B60Y2400/303 ,  B60Y2400/3032 ,  G01R31/2829 ,  G01R31/44 ,  G01R33/0023 ,  G01R33/0029 ,  G01R33/0041 ,  G01R33/06 ,  G01R33/072 ,  G06F11/0754 ,  G06F11/0772

Abstract: Described embodiments provide circuits, systems and methods for detecting and communicating fault conditions. In an embodiment, an integrated circuit includes a fault detector to detect a fault condition of the integrated circuit and a controller to generate output data of the integrated circuit. An output generator generates an output signal of the integrated circuit. The output signal is generated at a first set of output levels based upon the output data when the fault detector does not detect the fault condition, and the output signal is generated at a second set of output levels based upon the output data when the fault detector detects the fault condition.

公开(公告)号：US09621140B1

公开(公告)日：2017-04-11

申请号：US14996689

申请日：2016-01-15

Applicant: Allegro Microsystems, LLC

Inventor： Devon Fernandez ,  Eric Burdette

IPC: H03K3/00 ,  H03K5/04 ,  H03K17/64 ,  H03K17/60 ,  G01R33/06

CPC classification number: H03K5/04 ,  G01R33/0023 ,  G01R33/0041 ,  G01R33/06

Abstract: An electronic circuit has a current generator circuit that generates a two-state output current signal for which a transition between states is altered.

公开(公告)号：US20140333295A1

公开(公告)日：2014-11-13

申请号：US13891519

申请日：2013-05-10

Applicant: ALLEGRO MICROSYSTEMS, LLC

Inventor： Devon Fernandez ,  Paul David ,  William P. Taylor

IPC: G01B7/00

CPC classification number: G01B7/003 ,  G01R33/0023

Abstract: A magnetic field sensor with enhanced immunity to external magnetic interference is presented. Included is a magnetic field signal generator and a demodulator. The magnetic field signal generator produces a magnetic field signal having a modulated signal portion in a first frequency band based on a sensed modulated AC bias magnetic field. The modulated AC bias magnetic field is produced by movement of ferromagnetic target relative to a bias coil when an AC signal is applied to the bias coil. When the magnetic field signal also includes an unwanted signal portion in a second frequency band based on external magnetic interference, demodulation performed by the demodulator results in the modulated signal portion being shifted from the first frequency band to a third frequency band and the unwanted signal portion being shifted to the first frequency band. The bias coil may be provided as part of the magnetic field sensor.

Abstract translation: 提出了一种具有增强的对外部磁干扰的免疫力的磁场传感器。 包括磁场信号发生器和解调器。 磁场信号发生器基于感测的调制AC偏置磁场产生具有在第一频带中的调制信号部分的磁场信号。 当AC信号施加到偏置线圈时，调制的交流偏置磁场是通过铁磁体相对于偏置线圈的运动而产生的。 当磁场信号还包括基于外部磁干扰的第二频带中的不需要的信号部分时，由解调器执行的解调使得调制信号部分从第一频带移动到第三频带，并且不需要的信号部分 被移动到第一频带。 偏置线圈可以被设置为磁场传感器的一部分。

公开(公告)号：US20140232380A1

公开(公告)日：2014-08-21

申请号：US14259662

申请日：2014-04-23

Applicant: Allegro Microsystems, LLC

Inventor： Andrea Foletto ,  Devon Fernandez ,  Eric Burdette

IPC: G01D5/12

CPC classification number: G01D5/12 ,  G01D5/145 ,  G01D5/2448 ,  G01P3/487 ,  G01P3/488 ,  G01P3/489 ,  G01P21/02 ,  G01R25/005

Abstract: A motion sensor has a state processor to identify states associated with a magnetic field signal provided by a magnetic field sensing element. The state processor includes a state peak logic module configured to generate states that have a reduced amount of state chatter.

Abstract translation: 运动传感器具有状态处理器，用于识别与由磁场感测元件提供的磁场信号相关联的状态。 状态处理器包括状态峰值逻辑模块，其被配置为产生具有减少的状态抖动量的状态。

公开(公告)号：US20210181268A1

公开(公告)日：2021-06-17

申请号：US16715492

申请日：2019-12-16

Applicant: Allegro MicroSystems, LLC

Inventor： Jay M. Towne ,  Peter Tengstrand ,  Devon Fernandez

IPC: G01R33/00 ,  H03M3/00 ,  G01R33/02 ,  G01R35/00

Abstract: According to aspects of the disclosure, an apparatus is disclosed comprising: a controller; an analog-to-digital converter (ADC) coupled to the controller, the ADC including an input terminal for receiving a sensor signal from a transducer; and a diagnostic circuit coupled to the input terminal of the ADC and to the controller, the diagnostic circuit being configured to: generate a diagnostic signal that indicates whether a voltage at the input terminal of the ADC meets a first threshold, and provide the diagnostic signal to the controller, wherein the controller is configured to: receive a data sample from the ADC, detect whether the data sample meets a second threshold, and transition the apparatus into a safe state when: (i) the diagnostic signal indicates that the voltage at the input terminal does not meet the first threshold, and (ii) the data sample meets the second threshold

公开(公告)号：US09970996B2

公开(公告)日：2018-05-15

申请号：US14600826

申请日：2015-01-20

Applicant: ALLEGRO MICROSYSTEMS, LLC

Inventor： Devon Fernandez ,  Mathew Drouin

IPC: G01P3/00 ,  G01R33/09 ,  G01P13/00 ,  G01R33/07 ,  G01P3/487 ,  G01R33/00 ,  G01P13/04 ,  F02P7/067

CPC classification number: G01R33/09 ,  F02P7/067 ,  G01P3/487 ,  G01P13/00 ,  G01P13/045 ,  G01R33/0029 ,  G01R33/07

Abstract: A magnetic field sensor for detecting motion of an object includes threshold generation circuitry and processing. Magnetic field sensing elements are configured to generate a magnetic field signal in response to a magnetic field associated with the object. A motion detector responsive to the magnetic field signal and to a threshold signal is configured to generate a detector output signal having edges occurring in response to a comparison of the magnetic field signal and the threshold signal. A speed detector responsive to the detector output signal generates a speed signal indicative of a speed of motion of the object. A threshold generator responsive to the speed signal generates the threshold signal having a level that varies in response to the speed signal.