Wheel Speed Sensors

The Future of Automotive Wheel Sensing with GMR

February 23, 2022

P0083 - With the rise of vehicle electrification, computerized control systems, and subsystem reliability monitoring, it has become essential for systems to have accurate rotational information for each wheel of the vehicle.

Effect of Ring Magnet Dimensions on Differential Speed Sensor Performance

AN296251 - In this application note, we describe how ring magnet dimensions affect speed sensor performance is given.

Giant Magnetoresistance versus Hall-effect: A Comparison of Technologies for Speed Sensor Applications

Allegro MicroSystems giant magnetoresistance (GMR) effect technology offerings build on lessons learned from experience with Hall-effect devices to enable new options for speed sensing system design.

Differential Hall-Effect Sensors: Safer and More Reliable for Two-Wheelers of the Future

August 27, 2019

AN296173 - The use of electronic controls for engine, transmission, and wheel speed in two- and three-wheeled vehicles is growing, particularly in developing nations. This trend is largely driven by mandates to improve air quality, fuel efficiency, and vehicle safety worldwide.

Brochure: Allegro Wheel Speed Sensor ICs

Options to meet your evolving needs.

Brochure: High-Resolution GMR Wheel Sensing

The Allegro A19360 high-resolution wheel speed and distance sensor provides all the robustness of a standard differential speed sensor, but with up to four times the incremental resolution from the same magnetic encoders used today.

Speed Sensor Protocols

AN296246 - This application note provides a detailed description of commonly used output protocols implemented in speed sensors. It also lists the benefits and drawbacks of each and provides information on the safety mechanisms these protocols offer to achieve compliance with the latest automotive ...

Methods and Validation of Stray Magnetic Field Mitigation in Magnetic Speed Sensor ICs

AN296250 - This document provides an overview of the phenomena of stray magnetic fields, its various sources, solutions developed to minimize its effects, and product proposals tolerant to stray field perturbations.

System Advantages of High-Resolution Wheel Speed Sensing

AN296228 - With the vehicle market trending toward autonomous driving in the near future, the need for high resolution in the wheel speed sensor (WSS) business becomes essential. Allegro, with input from market leaders, has released the first high-resolution wheel speed sensor (HRWSS) that targets ...

Wheel Speed Sensors Operating in Harsh Environments

Wheel speed sensors (WSS) operate in harsh environments with limited shielding and temperature control. Allegro Microsystems has developed innovative algorithms and high-performance sensors to operate in these environments.

Fundamental Properties of Speed Sensors

The aim of this application note is to provide a solid foundation for understanding and comparing the fundamental properties of speed sensors that are valid not only for Allegro products but for speed sensors in general.

Understanding Input Signal Variation in Sensor ICs with SolidSpeed Digital Architecture

AN29622 - This application note is to be used to aid the understanding of these datasheet line items. This specification change can be seen in the A19302 and A19571 datasheets and will continue to be used in many parts that use this technology moving forward

Guidelines for Mapping Speed Sensor Targets

AN296283: This application note describes the various techniques that can be used to map customer targets for speed sensors.

Allegro Differential Speed Sensor System Solutions

Seth Prentice, Strategic Marketing Manager for Allegro MicroSystems Speed Sensor IC group, discusses IC solutions for designing speed sensing applications including automotive transmissions, washing machine drum speeds, and fork lift positioning requiring reliable consistent output signals.