Allegro Microsystems, LLC

Emil Pavlov

Ahmad Nour Halawani

Andreas P Friedrich

Simon Rock

Emanuele Andrea Casu

Cédric Gillet

Florencia Ferrer

Nicolás Rigoni

Till-Jonas Ostermann

Apparatus and methods for measuring a shunt resistance through which an input current flows, wherein the input current has a first frequency range, include a voltage source configured to generate an AC voltage having a second frequency range that is higher than the first frequency range. An inductor, a capacitor, and the shunt resistance form an RLC network to which the voltage source is coupled. Processing circuitry coupled to receive a superimposed voltage across the shunt resistance is configured to generate a measured resistance indicative of the shunt resistance in response to the superimposed voltage.

Circuits and methods for shunt resistance measurement

A signal encoding and decoding protocol to convey discrete sets of information combined in a single carrier signal is disclosed. The protocol uses modulation of both amplitude and pulse width to carry multiple sets of information. A first signal is pulse width modulated to encode a first data and a second signal is pulse amplitude modulated to encode a second data. The two modulated signals are combined to generate a carrier signal encoded with both the first and second data.

Output signal protocol

A method comprising: transmitting a data block that is part of a message, the data block including a plurality of data block symbols; detecting a duration of an end portion of the message, the duration being detected based on a difference between: (i) a time that is allotted for transmitting the message and (ii) a time needed for transmitting the data block as well as any other element of the message that precedes the end portion; and transmitting one or more auxiliary data symbols as part of the end portion of the message, wherein the end portion has a flexible duration that is selected to synchronize a total duration of the message to the time that is allotted for transmitting the message, and wherein each of the data block symbols and each of the auxiliary data symbols is encoded by using pulse-width modulation (PWM).

Method and apparatus for transmitting data

A sensor integrated circuit (IC) includes a sensing element configured to sense a parameter associated with a target, a processor coupled to the sensing element and configured to generate a sensed signal indicative of the parameter associated with the target, and an output module coupled to receive the sensed signal. The output module is configured to transmit absolute data on a message line at a first rate and transmit incremental data on one or more index lines at a second rate, wherein the second rate is faster than the first rate, wherein the incremental data comprises data associated with changes in the absolute data and wherein an edge or a pulse is used to indicate an incremental change has occurred in the absolute data.

Sensor signaling of absolute and incremental data

Methods and apparatus for a magnetic field sensor having first and second arrays of magnetic field sensing elements with at least first and second orthogonal axes of sensitivity. The first array of magnetic field sensing elements is spaced a first distance from the second array of magnetic field sensing elements. A turns counter counts a number of times a magnetic pole pair of a moving target passes the magnetic field sensing elements with a selected pole pair resolution and a module determines absolute angular position of the target from differential signals from the first and second arrays of magnetic field sensing elements and the turns counter. The first distance is configured to match a pitch of the poles of the target.

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Heidelberg, Germany

Emil Pavlov