Wheel Speed Sensors
Our patented, best-in-class GMR technology provides low jitter and high air gap over the widest installation tolerance—it also offers high accuracy for extremely precise wheel speed and position measurement, ideal for advanced braking and autonomous vehicle applications. Allegro's advanced, dynamic algorithms compensate for anomalies in driving behavior, guaranteeing steady state output behavior in the presence of system variation.
Allegro also offers a full line of Hall-based wheel speed devices for applications with both ferrous and ring magnet targets.
Plus, safety is one of our top priorities. Allegro’s latest portfolio offerings are designed to ISO 26262 specifications with integrated diagnostics and a certified safety design process.
Wheel Speed Sensor ICs Selection Guide
Selection & Solution Guides
Allegro Product Selection Guide (PDF)
Documentation & Resources
Application Note
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.
Application Note
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.
Technical Article
The Future of Automotive Wheel Sensing with GMR
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.
Application Note
Differential Hall-Effect Sensors: Safer and More Reliable for Two-Wheelers of the Future
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.
Application Note
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
Brochure
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.
Application Note
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 safety standards.
Application Note
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.
Brochure
Brochure: Allegro Wheel Speed Sensor ICs
Options to meet your evolving needs.
Application Note
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 this demand.
Application Note
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.
Application Note
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.
Video
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.