公开(公告)号：US20220128379A1

公开(公告)日：2022-04-28

申请号：US17647350

申请日：2022-01-07

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Jeffrey Eagen ,  Damien Dehu ,  Paul A. David ,  Andrea Foletto ,  Maxime Rioult

IPC: G01D5/16 ,  G01R33/09

Abstract: Methods and apparatus that can include a rotatable target to generate a sinusoidal signal in a magnetic field sensor, wherein the target includes a plurality of sinusoidal teeth to reduce angular error. A magnetic field sensor can be configured to determine a position of the target. In embodiments, a rotatable target to generate a sinusoidal signal in a magnetic field sensor can include a plurality of sinusoidal teeth and a number of harmonics to reduce angular error.

公开(公告)号：US20220107369A1

公开(公告)日：2022-04-07

申请号：US17060276

申请日：2020-10-01

Applicant: Allegro MicroSystems, LLC

Inventor： Florian Kulla ,  Andrea Foletto

IPC: G01R33/025 ,  G01R33/09 ,  G01R33/07

Abstract: A magnetic field sensor for detecting motion of an object includes one or more magnetic field sensing elements configured to generate a magnetic field signal in response to a magnetic field associated with the object and a detector configured to generate a comparison signal having edges occurring in response to a comparison of the magnetic field signal and a threshold signal and occurring at a rate corresponding to a speed of motion of the object. A speed monitor responsive to the comparison signal is configured to generate a speed signal having a value indicative of the speed of motion of the object. A threshold generator having an input coupled to receive the speed signal from the speed monitor and an output coupled to the detector is configured to generate the threshold signal at a first level when the value of the speed signal indicates that the speed of motion of the object is greater than a predetermined speed and at a second level when the value of the speed signal indicates that the speed of motion of the object is less than the predetermined speed.

公开(公告)号：US11294000B1

公开(公告)日：2022-04-05

申请号：US17060276

申请日：2020-10-01

Applicant: Allegro MicroSystems, LLC

Inventor： Florian Kulla ,  Andrea Foletto

IPC: G01R33/025 ,  G01R33/07 ,  G01R33/09

Abstract: A magnetic field sensor for detecting motion of an object includes one or more magnetic field sensing elements configured to generate a magnetic field signal in response to a magnetic field associated with the object and a detector configured to generate a comparison signal having edges occurring in response to a comparison of the magnetic field signal and a threshold signal and occurring at a rate corresponding to a speed of motion of the object. A speed monitor responsive to the comparison signal is configured to generate a speed signal having a value indicative of the speed of motion of the object. A threshold generator having an input coupled to receive the speed signal from the speed monitor and an output coupled to the detector is configured to generate the threshold signal at a first level when the value of the speed signal indicates that the speed of motion of the object is greater than a predetermined speed and at a second level when the value of the speed signal indicates that the speed of motion of the object is less than the predetermined speed.

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：US20200225020A1

公开(公告)日：2020-07-16

申请号：US16244452

申请日：2019-01-10

Applicant: Allegro MicroSystems, LLC

Inventor： Rémy Lassalle-Balier ,  Jeffrey Eagen ,  Andrea Foletto ,  Paul A. David

IPC: G01B7/14 ,  G01R33/09

Abstract: Methods and apparatus for s sensor having magnetic field sensing elements coupled in a differential bridge and a signal processor configured to receive signals from the bridge to determine a distance from the magnetic field sensing elements to a magnet from flux line divergence of magnetic flux generated by the magnet.

公开(公告)号：US20200080867A1

公开(公告)日：2020-03-12

申请号：US16686439

申请日：2019-11-18

Applicant: Allegro MicroSystems, LLC

Inventor： Andrea Foletto ,  Zachary Richards

IPC: G01D5/14 ,  G01D5/16

Abstract: A magnetic field sensor includes a plurality of magnetic field sensing elements configured to generate at least two measured magnetic field signals indicative of a magnetic field affected by an object and having a first predetermined phase difference with respect to each other and a controller responsive to the at least two measured magnetic field signals. The controller is configured to generate an angle signal and to compare the angle signal to at least one angle signal threshold. The angle signal can be compared to a plurality of angle signal thresholds to generate a plurality of output transitions, each output transitions indicative of the angle signal crossing the corresponding angle signal threshold. The number of angle signal thresholds can be dependent upon a desired number of output transitions per pole-pair of the angle signal.

公开(公告)号：US10385964B2

公开(公告)日：2019-08-20

申请号：US15176524

申请日：2016-06-08

Applicant: Allegro MicroSystems, LLC

Inventor： Yannick Vuillermet ,  Cédric Gillet ,  Andrea Foletto ,  Andreas P. Friedrich

IPC: G01P3/44 ,  G01P21/00 ,  G01P3/487 ,  G01P3/488 ,  G01D18/00 ,  G01D5/14 ,  F02D41/22 ,  F02D41/00 ,  F16H59/04

Abstract: Embodiments provide systems and methods for determining a position of a gear shift lever of a vehicle. A ferromagnetic target object having selected characteristics influences a magnetic field generated by a back bias magnet. A magnetic field sensor includes magnetic field sensing elements disposed proximate to the target object. Each magnetic field sensing element generates an electronic signal in response to sensed magnetic fields. The gear shift lever moves among a plurality of gears of the vehicle. The magnetic field sensor selects a set of the magnetic field sensing elements to determine a magnetic field difference based on a difference of amplitudes between the electronic signals that is related to a current position of the gear shift lever. Characteristics of the target object enable the magnetic field sensor to detect the position of the gear shift lever. The characteristics include edges proximate to a perimeter of the target object.

公开(公告)号：US20170191852A1

公开(公告)日：2017-07-06

申请号：US15466894

申请日：2017-03-23

Applicant: Allegro MicroSystems, LLC

Inventor： Andrea Foletto ,  Peter Cisar ,  Eric Shoemaker

IPC: G01D5/14 ,  G01D18/00

CPC classification number: G01D5/145 ,  G01D5/142 ,  G01D5/2449 ,  G01D5/247 ,  G01D18/008 ,  G01P3/488

Abstract: A magnetic field sensor includes a true power on state (TPOS) detector for which a measured threshold value is stored prior to power down and recalled upon power up. A corresponding method is associated with the magnetic field sensor.

公开(公告)号：US09644999B2

公开(公告)日：2017-05-09

申请号：US14250574

申请日：2014-04-11

Applicant: Allegro Microsystems, LLC

Inventor： Andrea Foletto ,  Peter Cisar ,  Eric Shoemaker

IPC: G01B7/30 ,  G01D18/00 ,  G01D5/247 ,  G01P3/488 ,  G01D5/244 ,  G01D5/14

CPC classification number: G01D5/145 ,  G01D5/142 ,  G01D5/2449 ,  G01D5/247 ,  G01D18/008 ,  G01P3/488

Abstract: A magnetic field sensor includes a comparator coupled to receive a calculated threshold value based upon a temperature signal, a stored value of a temperature coefficient signal, and a stored value of a measure threshold signal, and also coupled to receive a signal representative of a magnetic field signal. The comparator is configured to compare the calculated threshold value with the signal representative of the magnetic field signal to generate an output signal. A corresponding method is associated with the magnetic field sensor.

公开(公告)号：US09411023B2

公开(公告)日：2016-08-09

申请号：US14550202

申请日：2014-11-21

Applicant: Allegro MicroSystems, LLC

Inventor： Andreas P. Friedrich ,  Andrea Foletto ,  Gary T. Pepka

IPC: G01R33/07 ,  H01L43/08 ,  G01R33/00 ,  H01L43/06

CPC classification number: G01R33/072 ,  G01R33/0052 ,  G01R33/077 ,  H01L43/065

Abstract: A magnetic field sensor includes a circular vertical Hall (CVH) sensing element and at least one planar Hall element. The CVH sensing element has contacts arranged over a common implant region in a substrate. In some embodiments, the at least one planar Hall element is formed as a circular planar Hall (CPH) sensing element also having contacts disposed over the common implant region. A CPH sensing element and a method of fabricating the CPH sensing element are separately described.

Abstract translation: 磁场传感器包括圆形垂直霍尔（CVH）感测元件和至少一个平面霍尔元件。 CVH感测元件具有布置在衬底中的公共植入区域上的触点。 在一些实施例中，至少一个平面霍尔元件形成为也具有布置在公共植入区域上方的触点的圆形平面霍尔（CPH）感测元件。 分别描述CPH感测元件和制造CPH感测元件的方法。