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Allegro Microsystems Inc patents


Recent patent applications related to Allegro Microsystems Inc. Allegro Microsystems Inc is listed as an Agent/Assignee. Note: Allegro Microsystems Inc may have other listings under different names/spellings. We're not affiliated with Allegro Microsystems Inc, we're just tracking patents.

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Methods and apparatus for three-phase motor control with error compensation

Method and apparatus for providing error compensation for a magnetic field sensing element in a three-phase motor. In embodiments, a driving angle is determined from zero-crossings of the magnet pole-pairs and error compensation levels for the pole-pairs is determined to reduce distortions in the motor current waveform.. ... Allegro Microsystems Inc

Magnetic field sensor

In one aspect, a magnetic field sensor includes a chopper stabilized amplifier and a plurality of hall-type elements in parallel and connected to the chopper stabilized amplifier. In another aspect, a magnetic field sensor includes a chopper stabilized amplifier and a plurality of hall quad elements in parallel and connected to the chopper stabilized amplifier. ... Allegro Microsystems Inc

Circular vertical hall (cvh) sensing element with dc offset removal

A magnetic field sensor includes a semiconductor substrate, a circular vertical hall (cvh) sensing element comprising a plurality of hall elements arranged over an implant region in a semiconductor substrate, adjacent ones of the plurality of vertical hall element at predetermined angles from each other. A cvh output stage may comprise one or more of drive circuits to drive the plurality of vertical hall elements and produce an analog signal, and a filter coupled to the cvh output stage to receive the analog signal. ... Allegro Microsystems Inc

Current sensor system

Systems and methods are described herein for reducing the effects of magnetic field cross-coupling in a multi-conductor current sensor system. A current sensor system includes one or more current sensors, each positioned proximate to at least one conductor and spaced from at least one other conductor. ... Allegro Microsystems Inc

Methods and apparatus for phase selection in ring magnet sensing

Methods and apparatus for positioning a magnetic field sensor ic package having a first channel for a planar magnetic field sensing element and a second channel for vertical magnetic field sensing element in relation to an axis of a ring magnet to provide a desired phase relationship between the first and second channels. In embodiments, positioning the sensor includes an offset angle and a displacement with respect to a centerline of the ring magnet.. ... Allegro Microsystems Inc

Power on restoration of sensor hysteresis

Described embodiments provide circuits, systems and methods for generating a sensing signal in response to the ambient condition, comparing the sensing signal to a threshold hysteresis range to generate a digital signal, and upon powering on the sensor, determining whether the sensing signal is within the threshold hysteresis range and, if the sensing signal is within the threshold hysteresis range, setting the digital signal to a predetermined level based on a hysteresis restoration state associated with sensor before the sensor is powered off.. . ... Allegro Microsystems Inc

Arrangements for magnetic field sensors that act as movement detectors

Magnetic field sensors can sense speed of movement and direction of movement of a ferromagnetic object. The magnetic field sensors employ both planar hall effect elements and vertical hall effect elements to generate two-state signals in two different signal paths with relative phases that are ninety degrees apart, the ninety degrees having sufficient margin to aid in detection of the direction of motion. ... Allegro Microsystems Inc

Circuit for detecting motion of an object

A circuit for detecting motion of an object includes a semiconductor substrate having first and second opposing surfaces. The circuit also includes a magnetic field sensor disposed on the first surface of the substrate and configured to generate a respective plurality of magnetic field sensor output signals in response to a magnetic field associated with the object. ... Allegro Microsystems Inc

Control circuit

A control circuit includes an oscillator responsive to a control voltage to generate a clock signal having an associated frequency. A counter is responsive to the clock signal to generate a count signal and a comparator is responsive to the count signal and to a threshold signal to generate a comparison signal. ... Allegro Microsystems Inc

Multi-die integrated circuit device with capacitive overvoltage protection

An electronic device includes a package, a plurality of external leads extending outside the package, a first die within the package having one or more first contacts electrically coupled to at least a first one of the external leads, and a second die within the package having one or more second contacts electrically coupled to at least a second one of the external leads. A capacitive coupling may be positioned between the first and second die to allow electrostatic discharge (esd) current to flow between the first die and the second die in response to an esd event and to electrically isolate the first and second die from each other in the absence of the esd event.. ... Allegro Microsystems Inc

Light emitting diode driver for dimming and on/off control

In one aspect, an integrated circuit (ic) includes a first magnetic field sensor configured to sense a ring magnet, a second magnetic field sensor configured to sense the ring magnet and processing circuitry configured to receive a first signal from the first magnetic field sensor and to receive a second signal from the second magnetic field sensor. The processing circuitry is further configured to control an on/off state of at least one light emitting diode (led) and brightness of the led based on movement and position of the ring magnet with respect to the first and second magnetic field sensors.. ... Allegro Microsystems Inc

Methods and apparatus for motor startup with sinusoidal phase current

Methods and apparatus for controlling a three-phase motor and providing sinusoidal phase currents during startup. In embodiments, differential outputs from a magnetic field sensing element are used to generate a polarity signal used to provide a motor direction drive signal. ... Allegro Microsystems Inc

Voltage regulator having boost and charge pump functionality

Methods and apparatus for a voltage regulator having a boost module and a charge pump module. In embodiments, the charge pump module is configured to operate in multiple modes. ... Allegro Microsystems Inc

Systems and methods for sensing a voltage transient in a magnetic field sensor integrated circuit

The concepts, systems, circuits and techniques described herein are directed toward sensing a voltage transient within a magnetic field sensor integrated circuit, such as a current sensor. A magnetic field sensor integrated circuit includes a substrate having a first surface and a second opposing surface, at least one magnetic field sensing element supported by a first surface of the substrate, an electromagnetic shield layer disposed on a shielded region of the first surface of the substrate adjacent to an unshielded region of the first surface of the substrate and an electrode disposed in the unshielded region of the first surface of the substrate and configured to permit detection of the voltage transient. ... Allegro Microsystems Inc

05/31/18 / #20180149677

Systems and methods for integrated shielding in a current sensor

Systems and methods described herein are directed towards integrating a shield layer into a current sensor to shield a magnetic field sensing element and associated circuitry in the current sensor from electrical, voltage, or electrical transient noise. In an embodiment, a shield layer may be disposed along at least one surface of a die supporting a magnetic field sensing element. ... Allegro Microsystems Inc

05/17/18 / #20180136999

Diagnostic fault communication

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. ... Allegro Microsystems Inc

04/05/18 / #20180094951

Angle sensing using differential magnetic measurement and a back bias magnet

A magnetic field sensor includes a back bias magnet to generate a dc magnetic field. First and second magnetic field sensing elements of the magnetic field sensor are disposed proximate to at least one ferromagnetic surface of a ferromagnetic target object. ... Allegro Microsystems Inc

03/29/18 / #20180088184

Systems and methods for magnetic field sensors with self-test

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. ... Allegro Microsystems Inc

03/22/18 / #20180083442

Switched electrical overstress protection

An apparatus includes a first terminal, a second terminal, and a conduction path circuit coupled between the first and second terminals. The conduction path circuit includes an input terminal to receive an enable signal which, when activated, allows the conduction path circuit to conduct electrical current between the first and second terminal. ... Allegro Microsystems Inc

03/15/18 / #20180076909

Signal isolator having bidirectional diagnostic signal exchange

Methods and apparatus for a signal isolator having first and second dies separated by a voltage barrier region, wherein transmit and receive paths of the first and second dies provide bi-directional transfer of feedback and/or diagnostic signals between the first and second die. In embodiments, transmitter refresh signals and receiver refresh signals are exchanged to detect fault conditions.. ... Allegro Microsystems Inc

03/15/18 / #20180076176

Signal isolator having bidirectional communication between die

Methods and apparatus for bi-directional communication between first and second die of a signal isolator for feedback and/or diagnostic signals. In embodiments, the first and second die can be matched.. ... Allegro Microsystems Inc

03/15/18 / #20180074137

Hall effect sensing element

In one aspect, a hall effect sensing element includes a hall plate having a thickness less than about 100 nanometers an adhesion layer directly in contact with the hall plate and having a thickness in a range about 0.1 nanometers to 5 nanometers. In another aspect, a sensor includes a hall effect sensing element. ... Allegro Microsystems Inc

03/08/18 / #20180067174

Providing information about a target object in a formatted output signal

In one aspect, an integrated circuit (ic) includes a sensor. The sensor includes a processor configured to provide speed and/or direction of a target object based on the speed of the target object; monitor for a diagnostic fault; provide information if the diagnostic fault is detected; monitor for critical faults; and provide information if a critical fault is detected and the sensor recovers from the critical fault.. ... Allegro Microsystems Inc

03/01/18 / #20180062072

Double pinned magnetoresistance element with temporary ferromagnetic layer to improve annealing

A double pinned magnetoresistance element has a temporary ferromagnetic layer, two ptmn antiferromagnetic pinning layers, and two associated synthetic antiferromagnetic (saf) pinned layer structures, the temporary ferromagnetic layer operable to improve annealing of the two ptmn antiferromagnetic pinning layers and the two associated safs to two different magnetic directions that are a relative ninety degrees apart.. . ... Allegro Microsystems Inc

03/01/18 / #20180061820

Multi-die integrated circuit device with overvoltage protection

An apparatus includes a package, a plurality of external connections extending outside the package, and a first die having a first electrical contact coupled to a first connection of the plurality of external connections. The apparatus also includes a second die having a second electrical contact coupled to a second connection of the plurality of external connections. ... Allegro Microsystems Inc

03/01/18 / #20180061784

Multi-die integrated circuit device with capacitive overvoltage protection

An electronic device includes a package, a plurality of external leads extending outside the package, a first die within the package having one or more first contacts electrically coupled to at least a first one of the external leads, and a second die within the package having one or more second contacts electrically coupled to at least a second one of the external leads. A capacitive coupling may be positioned between the first and second die to allow electrostatic discharge (esd) current to flow between the first die and the second die in response to an esd event and to electrically isolate the first and second die from each other in the absence of the esd event.. ... Allegro Microsystems Inc

03/01/18 / #20180059148

Current sensor

A current sensor includes a ferromagnetic core having a substantially central opening for receiving a current conductor and a gap. A detector of the current sensor includes at least one first magnetic field sensing element disposed in a first gap portion and configured to generate a respective first magnetic field signal in response to a first magnetic field having a first angle with respect to the at least one first magnetic field sensing element. ... Allegro Microsystems Inc

02/15/18 / #20180049283

Apparatus and methods for converter mode and load configuration control

A driver coupled to a configurable load includes a first switch coupled between an intermediate node of the load and a converter supply voltage and a second switch coupled between the converter supply voltage and a reference potential. A slew rate control circuit is responsive to a command input signal and to a feedback voltage across the first and second switches and is configured to generate switch control signals with a controllable slew rate for coupling to control terminals of the first and second switches. ... Allegro Microsystems Inc

02/08/18 / #20180038897

Current sensor

A current sensor includes a ferromagnetic core having a substantially central opening for receiving a current conductor and at least two gaps portions, each of the gap portions having an associated gap spacing. A detector of the current sensor includes at least one first sensing element disposed in a first one of the gap portions and configured to generate a respective first magnetic field signal in response to a first magnetic field generated in the first gap portion in response to a current through the current conductor. ... Allegro Microsystems Inc

02/01/18 / #20180033955

Methods for patterning a magnetic sensing layer

The present disclosure is directed towards a method for patterning a magnetic sensing layer. The method includes disposing a protective layer on a first of a substrate, disposing a first insulating layer on a first surface of protective layer. ... Allegro Microsystems Inc

01/18/18 / #20180017638

Temperature-compensated magneto-resistive sensor

In one aspect, an integrated circuit (ic) includes a sensor that includes a first magnetoresistive (mr) element and a second mr element less active to a presence of a magnetic field than the first mr element. The second mr element includes a metal layer diffused into other layers of the second mr element.. ... Allegro Microsystems Inc

01/18/18 / #20180017637

Systems and methods for reducing high order hall plate sensitivity temperature coefficients

The systems and methods described can reduce high order temperature coefficients on the hall plate sensitivity. A temperature coefficient circuit may include a first amplifier to receive a first reference voltage generated in conjunction with a proportional to absolute temperature (ptat) device and a second amplifier to receive a second reference voltage generated in conjunction with a complementary to absolute temperature (ctat) device, the second amplifier having a second output node. ... Allegro Microsystems Inc

01/18/18 / #20180017616

Magnetic field sensor with shared path amplifier and analog-to-digital-converter

Methods and apparatus for processing a signal comprise at least one circuit configured to generate a measured signal during a measured time period and a reference signal during a reference time period. Also included is at least one dual- or multi-path analog-to-digital converter comprising at least a first processing circuit configured to process the measured signal, at least a second processing circuit configured to process the reference signal, and a third processing circuit configured to process both the measured signal and the reference signal.. ... Allegro Microsystems Inc

01/18/18 / #20180017615

Enabling testing of an integrated circuit at a single temperature

In one aspect, an integrated circuit (ic) includes an output port enabling measurement of a performance characteristic of the ic at a first temperature. The performance characteristic of the ic is a minimum value at the first temperature with respect to any other temperature. ... Allegro Microsystems Inc

01/18/18 / #20180017412

Magnetic field sensor for detecting motion of an object

A magnetic field sensor for detecting motion of an object includes a magnet configured to generate a magnetic field and having a first surface adjacent to the object and a second surface distal from the object. The first surface of the magnet has a centerline axis substantially parallel to and disposed on the first surface, and the centerline axis is diagonal with respect to a motion axis substantially parallel to and disposed on the first surface and parallel to which the object moves. ... Allegro Microsystems Inc

01/11/18 / #20180011150

Methods and apparatus for magnetic sensor having integrated coil

Methods and apparatus for a magnetic sensor having a die and sensor circuitry formed in a device layer of the die with a coil integrated with the die to generate a magnetic field. A magnetoresistive magnetic field sensing element on the die detects changes in the magnetic field generated by the coil as a result of the presence of a ferromagnetic target. ... Allegro Microsystems Inc

01/11/18 / #20180011140

Magnetic field sensor with shared path amplifier and analog-to-digital-converter

A magnetic field sensor comprises at least one magnetic field sensing element configured to generate a measured magnetic field signal responsive to an external magnetic field; a diagnostic circuit configured to generate a diagnostic signal, wherein the diagnostic signal is not dependent on a measured magnetic field; a signal path comprising an amplifier and an analog-to-digital converter for processing the measured magnetic field signal to generate a sensor output signal indicative of the external magnetic field during a measured time period and for processing the diagnostic signal during a diagnostic time period; and a switch coupled to receive the measured magnetic field signal and the diagnostic signal and direct the measured magnetic field signal to the signal path during the measured time period and direct the diagnostic signal to the signal path during the diagnostic time period.. . ... Allegro Microsystems Inc

12/28/17 / #20170371007

Bilayer hardmask

In one aspect, a method includes etching a magnetic field sensor element covered by a bilayer hardmask. In another aspect, a method includes depositing a silicon nitride on a magnetic field sensor element, depositing a silicon dioxide on the silicon nitride, forming the bilayer mask by etching the silicon dioxide and etching the magnetic field sensor element partially covered by the bilayer hardmask. ... Allegro Microsystems Inc

12/21/17 / #20170366120

Determining motor position with complementary driving and detection and current injection

Methods and apparatus for determining a position of a rotor in motor, such as a three-phase motor by determining first and second ones of sectors in which a first one of the magnetic poles of the rotor may be positioned by driving phase pairs with complementary signals and examining a voltage of a floating one of the phases. Embodiments can further include driving first and second currents towards the first and second ones of the sectors and analyzing a time for each of the first and second currents to reach a threshold to identify which of the first and second ones of the sectors is aligned with the first one of the magnetic poles of the rotor.. ... Allegro Microsystems Inc

12/21/17 / #20170366114

Determining motor position with complementary drive and detect and slight move

Methods and apparatus for determining a position of a rotor in a three-phase motor by determining first and second ones of sectors in which a first one of the magnetic poles of the rotor may be positioned by respectively driving phase pairs complementary signals and examining a voltage of a floating one of the phases. Embodiments can include applying torque to the motor by driving at least one phase pair with respective signals aligned in phase and unequal duty cycles to move the rotor a given amount from the rotor position in the first or second ones of the sectors for determining the position of the rotor.. ... Allegro Microsystems Inc

12/14/17 / #20170356967

Magnetic field sensor having error correction

A magnetic field sensor includes a first magnetic field sensing element configured to produce a first signal representing a detected external magnetic field; a circular vertical hall element configured to produce a second signal representing an amplitude of the external magnetic field; and an error compensation circuit coupled to receive the first and second signal, compute an error value based on the amplitude of the external magnetic field, and apply the error value to the first signal to compensate for an error in the first signal.. . ... Allegro Microsystems Inc

12/14/17 / #20170356966

Magnetic field sensor having alignment error correction

A method of calibrating a magnetic field sensor includes setting a first input signal at a first input node of a processor of the magnetic field sensor to a constant value. While the magnetic field sensor experiences a magnetic field, a first transition at an output node of the processor is measured. ... Allegro Microsystems Inc

12/14/17 / #20170356763

Enhanced neutral gear sensor

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. ... Allegro Microsystems Inc

12/14/17 / #20170356762

Magnetic field sensor for sensing a proximity and/or a location of an object

A back-biased magnetic field sensor can have one or more vertical hall effect elements arranged within a substrate region of a substrate, wherein magnetic fields are oriented substantially vertical to the substrate within the substrate region when a ferromagnetic object is not proximate. When the ferromagnetic object becomes proximate, the magnetic field sensor can sense at least the proximity, and, in some embodiments, can also localize a position of the ferromagnetic object relative to the magnetic field sensor.. ... Allegro Microsystems Inc

12/14/17 / #20170356761

Arrangements for magnetic field sensors that act as movement detectors

Magnetic field sensors can sense speed of movement and direction of movement of a ferromagnetic object. The magnetic field sensors employ both planar hall effect elements and vertical hall effect elements to generate two-state signals in two different signal paths with relative phases that are ninety degrees apart, the ninety degrees having sufficient margin to aid in detection of the direction of motion. ... Allegro Microsystems Inc

12/14/17 / #20170356760

Arrangements for magnetic field sensors to cancel offset variations

Magnetic field sensors can sense speed of movement and direction of movement of a ferromagnetic object. Particular arrangements of magnetic field sensing elements within the magnetic field sensor can automatically cancel offset variations in the magnetic field sensing elements.. ... Allegro Microsystems Inc

12/14/17 / #20170356759

Magnetic field sensor for sensing a proximity of an object

A back-biased magnetic field sensor uses one or more magnetic field sensing elements upon a substrate, each outside of a substrate region in which magnetic field lines are near perpendicular to the substrate and outside of which magnetic field lines are not to the substrate. The back-biased magnetic field sensor can sense an approaching and/or a retreating ferromagnetic object.. ... Allegro Microsystems Inc

11/30/17 / #20170346420

Sensorless brushless direct current (bldc) motor position control

Described embodiments provide circuits, systems and methods for controlling operation of brushless direct current motors that include a plurality of windings. A gate driver provides control signals to switching elements that control a voltage applied to each of the windings of the motor. ... Allegro Microsystems Inc

11/23/17 / #20170336481

Gain equalization for multiple axis magnetic field sensing

A magnetic field sensor for sensing external magnetic fields on multiple axes comprises a coil structure and a gain equalization circuit. The coil structure generates reference fields on magnetic field sensing elements in each axis. ... Allegro Microsystems Inc

11/16/17 / #20170328739

Magnetic field sensor providing a movement detector

A magnetic field sensor has a plurality of magnetic field sensing elements and operates as a motion detector for sensing a rotation or other movement of a target object.. . ... Allegro Microsystems Inc

11/09/17 / #20170324364

Motor control using phase current and phase voltage

Methods and apparatus to control a three-phase bldc motor using phase current and phase voltage at zero current detection and a driving current derived from a bus current, for example. The driving current can be combined with a difference angle with an output provided to a controller to control a speed of the motor/. ... Allegro Microsystems Inc

10/26/17 / #20170307407

Magnetic field sensor to detect a magnitude of a magnetic field in any direction

In one aspect, a magnetic field sensor includes first and second magnetic field sensing elements having respective first and second maximum response axes. The first and second maximum response axes point along respective first and second different coordinate axes. ... Allegro Microsystems Inc

10/05/17 / #20170287894

Devices with an embedded zener diode

In one aspect, a silicon-controlled rectifier (scr) includes a zener diode embedded in the scr. In another aspect, a laterally diffused metal oxide semiconductor (ldmos) includes a zener diode embedded in the ldmos. ... Allegro Microsystems Inc

10/05/17 / #20170285117

Magnetic field sensor and electronic circuit that pass amplifier current through a magnetoresistance element

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

09/28/17 / #20170278981

Magnetic field sensor integrated circuit with integral ferromagnetic material

A magnetic field sensor includes a lead frame, a semiconductor die having a first surface in which a magnetic field sensing element is disposed and a second surface attached to the lead frame, and a non-conductive mold material enclosing the die and at least a portion of the lead frame. The sensor may include a ferromagnetic mold material secured to a portion of the non-conductive mold material. ... Allegro Microsystems Inc

09/21/17 / #20170269627

Bandgap reference circuit

A bandgap reference circuit includes a voltage reference circuit configured to generate a reference voltage at a first output and a proportional to absolute temperature (ptat) current source configured to generate a ptat current reference at a second output. A divider circuit is coupled to the reference voltage and configured to generate a divided reference voltage at a third output of the bandgap reference circuit. ... Allegro Microsystems Inc

09/21/17 / #20170268903

Assembly using a magnetic field sensor for detecting a rotation and a linear movement of an object

An assembly has a base structure, a rotatable structure, a first magnet coupled to the base structure, a second magnet coupled to the rotatable structure, and a magnetic field sensor. The magnetic field sensor can identify at least one condition (i.e., position) of the assembly.. ... Allegro Microsystems Inc

09/14/17 / #20170261567

Electronic circuit for compensating a sensitivity drift of a hall effect element due to stress

The present disclosure is directed to an electronic circuit having a hall effect element and a resistor bridge, all disposed over a common semiconductor substrate. The resistor bridge includes a first set of resistive elements having a first vertical epitaxial resistor and a first lateral epitaxial resistor coupled in series, and a second set of resistive elements having a second vertical epitaxial resistor and a second lateral epitaxial resistor coupled in series. ... Allegro Microsystems Inc

09/14/17 / #20170261546

Integrated circuit and method for detecting a stress condition in the integrated circuit

An integrated circuit includes at least one first magnetic field sensing element including at least one first magnetoresistance element configured to provide an output signal of the integrated circuit in response to a detected magnetic field. The integrated circuit also includes at least one second magnetic field sensing element including at least one second magnetoresistance element configured to have a characteristic indicative of a stress condition. ... Allegro Microsystems Inc

09/07/17 / #20170254863

Magnetic field sensor with improved response immunity

A magnetic field sensor includes a plurality of magnetoresistance elements, each having at least one characteristic selected to provide a respective, different response to an applied magnetic field, wherein each of the plurality of magnetoresistance elements is coupled in parallel. Illustrative characteristics selected to provide the respective responses include dimensions and/or construction parameters such as materials, layer thickness and order, and spatial relationship of the magnetoresistance element to the applied magnetic field. ... Allegro Microsystems Inc

08/31/17 / #20170250634

Control timing and sequencing for a multi-phase electric motor

Described embodiments provide an electronic circuit for controlling a motor. The electronic circuit includes a magnetic field sensing circuit responsive to magnetic field sensing elements disposed to sense rotation of the motor. ... Allegro Microsystems Inc

08/31/17 / #20170250143

Integrated circuit device with overvoltage discharge protection

An integrated circuit device includes a package and at least two leads exposed external to the package to permit electrical connections to the package. A first die situated in the package has a first substrate and at least a first terminal electrically coupled to a first one of the leads. ... Allegro Microsystems Inc

08/17/17 / #20170234702

Angle sensing using differential magnetic measurement and a back bias magnet

A magnetic field sensor includes a back bias magnet to generate a dc magnetic field. First and second magnetic field sensing elements of the magnetic field sensor are disposed proximate to at least one ferromagnetic surface of a ferromagnetic target object. ... Allegro Microsystems Inc

08/10/17 / #20170229986

Motor control current zero crossing detector

A driver circuit is provided for driving a load, such as a multi-phase motor. The driver circuit includes a gate driver for providing a control signal to switching elements coupled to the driver circuit. ... Allegro Microsystems Inc

08/03/17 / #20170219665

Circular vertical hall (cvh) sensing element with signal processing and arctangent function

A magnetic field sensor includes a circular vertical hall (cvh) sensing element to produce a signal representing an external magnetic field as detected by the cvh sensing element, a sigma-delta analog-to-digital converter to generate a converted signal, modulators to produce quadrature modulated signals from the converted signal, and a processor to produce an estimated angle of the external magnetic field using the quadrature modulated signals. An arctangent function may be used to calculate the estimated angle. ... Allegro Microsystems Inc

08/03/17 / #20170219664

Circular vertical hall (cvh) sensing element with sliding integration

A magnetic field sensor comprises a circular vertical hall (cvh) sensing element comprising a plurality of vertical hall elements, each vertical hall element comprised of a respective group of vertical hall element contacts selected from among a plurality of vertical hall element contacts. A quadrature modulator circuit is coupled to the digital signal and operable to generate a plurality of quadrature modulated signals. ... Allegro Microsystems Inc

08/03/17 / #20170219663

Circular vertical hall (cvh) sensing element with signal processing

A magnetic field sensor comprises a circular vertical hall (cvh) sensing element having a plurality of vertical hall elements. A cvh output stage is included comprising one or more of drive circuits to drive the plurality of vertical hall elements and produce an analog signal representing a strength of an external magnetic field as detected by the plurality of vertical hall elements. ... Allegro Microsystems Inc

08/03/17 / #20170219662

Method and system for providing information about a target object in a formatted output signal

The present disclosure is directed to methods and systems for providing information about a target based on pulse widths. The information can be provided in a formatted output signal which uses a pulse width protocol to code information by varying amplitudes and widths of successive pulses in an output signal pulse train portion. ... Allegro Microsystems Inc

07/06/17 / #20170191852

Magnetic field sensor and associated method that can establish a measured threshold value and that can store the measured threshold value in a memory device

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.. ... Allegro Microsystems Inc

06/29/17 / #20170187280

Compensating for voltage changes in driver circuits

In one aspect, an integrated circuit (ic) is configured to receive an input signal and includes a boost duty cycle control circuit configured to provide duty cycle control to a power conversion stage configured to drive a load. The power conversion stage is configured to receive an input voltage. ... Allegro Microsystems Inc

06/22/17 / #20170179377

Methods for magnetic sensor having non-conductive die paddle

Methods for providing a sensor integrated circuit package including employing a conductive leadframe and forming a non-conductive die paddle in relation to the leadframe. The method can further include placing a die on the non-conductive die paddle to form an assembly, forming at least one electrical connection between the die and the leadframe, and overmolding the assembly to form an integrated circuit package.. ... Allegro Microsystems Inc

06/22/17 / #20170176566

Circuits and techniques for performing self-test diagnostics in a magnetic field sensor

Systems and methods are provided herein for performing a self-test of a magnetic field sensor using internal diagnostic components for fault detection. The magnetic field sensor includes a magnetic sensing element coupled to a sensor biasing current source and a switching network coupled to the magnetic sensing element. ... Allegro Microsystems Inc

06/08/17 / #20170161218

Device configuration using a magnetic field

Described embodiments provide a device configured to be coupled to a shared bus. The device includes a magnetic field sensing element to sense a magnetic field. ... Allegro Microsystems Inc

06/01/17 / #20170153996

Non-linear transmit biasing for a serial bus transmitter

Described embodiments provide a transmitter for transmitting data over a serial bus coupled to the transmitter. The transmitter includes a controller to generate data for transmission by the transmitter. ... Allegro Microsystems Inc

05/18/17 / #20170141714

Circuits and techniques for voltage monitoring of a solid-state isolator

An isolation switch driver includes a control circuit to control conduction of an isolation switch and a voltage monitor circuit to monitor a control voltage coupled to the isolation switch and to generate a fault indication if the control voltage is less than a predetermined threshold. The isolator driver can drive an isolation switch coupled between a bridge network and a motor in a motor control system. ... Allegro Microsystems Inc

05/18/17 / #20170141562

Circuits and techniques for signaling between devices

A method for signaling between a controller and a driver includes receiving, at a pin of the driver coupled to the controller, a command signal generated by the controller and generating, by the driver at the pin coupled to the controller, a fault signal indicating a fault condition. The driver can be configured to drive a switch and the command signal can be configured to cause the driver to open the switch when the command signal is in a first state and to close the switch when the command signal is in a second state. ... Allegro Microsystems Inc

04/27/17 / #20170117801

Apparatus and methods for extending sensor integrated circuit operation through a power disturbance

A sensor integrated circuit includes an energy storage device having a first terminal coupled to a functional circuit and a blocking circuit coupled between a power supply pin and the first terminal of the energy storage device. The blocking circuit permits the energy storage device to store energy from an external power supply coupled to the power pin. ... Allegro Microsystems Inc

04/27/17 / #20170115362

Methods and apparatus for sensor having fault trip level setting

Methods and apparatus for a sensor having non-ratiometric fault trip level setting. In embodiments, a sensor has a sensing element with a fixed gain. ... Allegro Microsystems Inc

04/20/17 / #20170110652

Integrated circuit having first and second magnetic field sensing elements

An integrated circuit can have a first substrate supporting a magnetic field sensing element and a second substrate supporting another magnetic field sensing element. The first and second substrates can be arranged in a variety of configurations. ... Allegro Microsystems Inc

04/06/17 / #20170099037

Electronic amplifier with a feedback circuit that includes a transconductance amplifier

An electronic amplifier has a feedback circuit with a transconductance amplifier.. . ... Allegro Microsystems Inc

03/30/17 / #20170089987

Magnetic field sensors and methods using mixing in a magnetoresistance element

A magnetic field sensor and an associated method use one or more magnetoresistance elements driven with an ac mixing current and experiencing an ac mixing magnetic field to generate a dc voltage signal or a dc voltage signal component related to a slope of a transfer curve of the one or more magnetoresistance elements.. . ... Allegro Microsystems Inc

03/23/17 / #20170084831

Vertical hall effect element with improved sensitivity

A vertical hall effect element includes a low voltage p-well region disposed at a position between pickups of a vertical hall effect element to result in an improved sensitivity of the vertical hall effect element. A method results in the vertical hall effect element having the improved sensitivity.. ... Allegro Microsystems Inc

02/23/17 / #20170054363

Systems and methods for dc power conversion

A system for regulating voltage includes a power supply input node configured to receive a power supply voltage. The system also includes a voltage reduction circuit having an input node coupled to the power supply input node and an output node. ... Allegro Microsystems Inc

02/09/17 / #20170038437

Magnetic sensor having enhanced linearization by applied field angle rotation

Method and apparatus for a current sensing device including a magnetoresistive magnetic field sensing element positioned with respect to a shaped conductor such that an applied field generated by current through the shaped conductor forms an offset angle theta defined by the applied field and a field of a pinning layer of the magnetoresistive element. The offset angle increases a linearity of the device output for current in the shaped conductor flowing in a first direction. ... Allegro Microsystems Inc

02/02/17 / #20170030980

Structure and system for simultaneous sensing a magnetic field and mechanical stress

A structure having collocated magnetic field sensing elements can be used to simultaneously determine magnetic field and mechanical stress. A primary magnetic field sensing element generates a primary signal responsive to a magnetic field and a secondary magnetic field sensing element generates a secondary signal responsive to mechanical stress. ... Allegro Microsystems Inc

02/02/17 / #20170030979

Circuits and methods for removing a gain offset in a magnetic field sensor

A magnetic field sensor and a method include a modulator coupled in a feedback arrangement and operable to modulate a calibration feedback signal with a modulator clock signal having a selected frequency and a selected relative phase operable to remove a gain error in the magnetic field sensor and in the method.. . ... Allegro Microsystems Inc

01/19/17 / #20170019015

Switching regulator with controllable dead time and quick start

A driver circuit for driving a switching transistor includes a dead time calibration circuit and/or a quick start circuit. The dead time calibration circuit includes a delay comparator to compare a present delay between the low side switch turning off or the high side switch turning off and a voltage at a switch node between the high side switch and the low side switch to a past delay and a controller responsive to the comparison is configured to adjust the delay of an adjustable delay element coupled to a control terminal of a switching transistor. ... Allegro Microsystems Inc

01/19/17 / #20170016965

Methods and apparatus for trimming a magnetic field sensor

Method and apparatus for trimming a magnetic field sensor having a first magnetic field sensing element. In embodiments, trimming includes the use of a curve for normalized sensitivity of the first magnetic field sensing element derived from a first curve corresponding to current through a coil in a first direction at a first time to produce a field affecting the first magnetic field sensing element versus an external field and a second curve corresponding to current through the coil in a second direction opposite to the first direction at a second time to produce a field affecting the first magnetic field sensing element versus an external field.. ... Allegro Microsystems Inc








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