公开(公告)号：US20220107207A1

公开(公告)日：2022-04-07

申请号：US17060235

申请日：2020-10-01

Applicant: Allegro MicroSystems, LLC

Inventor： Philip Suyderhoud ,  Logan G. Stewart ,  Steven E. Snyder

IPC: G01D5/14 ,  G01P13/00

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 motion of the object and a detector responsive to the magnetic field signal and to a threshold signal and configured to generate a comparison signal having edges occurring in response to a comparison of the magnetic field signal to the threshold signal. A threshold generator is configured to generate the threshold signal at a first level when a peak-to-peak value of the magnetic field signal is greater than a first predetermined value and at a second level when the peak-to-peak value of the magnetic field signal is less than a second predetermined value different than the first predetermined value.

公开(公告)号：US11029370B1

公开(公告)日：2021-06-08

申请号：US16881238

申请日：2020-05-22

Applicant: Allegro MicroSystems, LLC

Inventor： Jonathan Zimmermann ,  Steven E. Snyder ,  Pablo Daniel Pareja Obregón

IPC: G01R33/07 ,  G01R33/00 ,  G01R19/155 ,  G01R1/20

Abstract: A sensor configured to generate a sensor output signal at a sensor output coupled to a pull up voltage through a pull up resistor includes a sensing element configured to generate a sensing element output signal indicative of a sensed parameter and a processor responsive to the sensing element output signal and configured to generate a processor output signal indicative of the sensed parameter. A digital output controller is responsive to the processor output signal and to a digital feedback signal and is configured to generate a controller output signal. An analog output driver is responsive to the controller output signal and configured to generate the sensor output signal at a first predetermined level or at a second predetermined level and a feedback circuit coupled between the sensor output and the digital output controller is configured to generate the digital feedback signal in response to the sensor output signal.

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：US10156461B2

公开(公告)日：2018-12-18

申请号：US14529497

申请日：2014-10-31

Applicant: Allegro MicroSystems, LLC

Inventor： Steven E. Snyder ,  Craig McConnell ,  Peter G. Wells

IPC: G01R33/09 ,  G01P3/487 ,  G01P13/04 ,  G01P3/488 ,  G01D18/00 ,  G01D5/14 ,  G01P21/02

Abstract: A magnetic field sensor for detecting motion of an object includes error detection circuiting and processing. Magnetic field sensing elements are configured to generate at least two magnetic field signals in response to a magnetic field associated with the object which signals are used by detectors to generate right and left channel signals with edges indicative of motion of the object. A direction calculation processor responsive to right and left channel signals generates a direction signal having a state indicative of a direction of motion of the object and an output signal generator generates an output signal having a pulse indicative of the direction of motion of the object in response to the direction signal. An error detection processor responsive to the output signal and to the direction signal is configured to detect an error in at least one of the direction signal and the output signal.