Magnetic Position Sensors
Smarter sensing for motion, angle and linear position.
Allegro’s position sensors deliver accurate, contactless linear and rotary measurements across harsh automotive and industrial environments. With support for multiple output protocols, these sensors simplify design, reduce system complexity, and enable advanced diagnostics in safety-critical applications.
Browse by category
Linear Hall Sensors (1D)
Our linear position sensors deliver high-accuracy one dimensional (1D) position sensing with advanced linearization and strong immunity to air gap variations.
Motor Position Sensors (2D)
Allegro’s 2D angle sensors deliver analog and ultra-low latency (~10 µs) digital outputs for precise motor control in automotive, industrial and robotics applications.
Multi-Axis Linear and Angle Sensors (3D)
Unlock greater mechanical design flexibility and precision with Allegro’s 3DMAG™ multi-axis sensors engineered to capture complex linear and angular motion.
Documentation & Resources
Technical Article
Magnetic Position Sensors Efficiently Drive E-Bike with Pedal Assist Systems
This technical article describes two designs for the pedal-rate measurement: a design using a pair of one-dimensional (1D) magnetic position sensors, which is common; and a two-dimensional (2D) magnetic speed and direction sensor design.
Application Note
Achieving Fast SENT Message Response with A1346 Linear Hall-Effect Sensor ICs on Shared Bus
AN296131 - In safety-critical magnetic sensing applications, such as torque sensing in electronic power steering (EPS) modules, redundant sensors are often the approach used to achieve desired performance while maintaining strict safety requirements.
Application Note
Application and Advantages of Allegro's ATS344LSP Magnetically Back-Biased Differential Linear Sensor IC
AN296157 - This application note aims to give insight on typical use of the Allegro ATS344LSP back-biased differential linear sensor IC. The main application of this sensor is to measure linear movements, such as shaft axial displacement.
Application Note
Joystick with Allegro Position Sensor IC
Joysticks are widely used human-machine interfaces (HMI) that simultaneously report information on direction and amplitude. This document explains how to implement a 2D or 3D magnetic sensor to obtain a joystick with well-defined behavior.
Application Note
Signal Path Delay for A31315 3D Sensor
AN296263 - The delay in a signal path can be described as the trail between the real-time angle and the displayed output angle. This delay represents the time needed to convert the magnetic field data sensed by the Hall plates into angle information.
Application Note
Two-Point-Programming for the A1330
AN296199 - This application note serves as a guide for using a two-point programming algorithm to calculate and program the values needed for short-stroke rotational position sensing with the A1330 angle sensor IC.
Application Note
Using A1330 ASEK DLLs to Make Two-Point Labview Programmer
AN296186 - This application note provides guidelines on how to use the A1330 dynamically linked library (DLL) with LabVIEW.
Application Note
Enhancements to Slide-By Detection with Linear Sensors
AN296200 - This application note presents a modified solution to magnetic sensing in long stroke applications. Through the incorporation of a microcontroller, a lower cost solution can be realized with fewer linear sensors than previously existing arc tangent solutions.
Brochure
3DMAG Position Sensors
Combining our proven planar and vertical Hall technologies, 3DMAG solutions offer robust, high-performing, three-axis magnetic field measurements in a single IC.
Application Note
3D Hall-Effect Sensor Magnetic Tamper Detection Smart Home Systems
AN296223 - The experiment results highlight several advantages of 3D Hall-effect sensors such as their ability to detect strong magnetic fields that are randomly applied to the outside of a smart home device.
Technical Article
Enabling New Levels of Performance and Safety in Magnetic Sensors with xMR
P0224: This article compares Hall-effect and magnetoresistance sensor technologies and discusses solutions to leverage these to minimize tradeoffs and meet the requirements of the most advanced emerging automotive and industrial automation applications.
Technical Article
Enhancing Smart Home Security with 3D Magnetic Sensors
P0173 - As consumers find new ways to outfit their living spaces with simple-to-use smart home and Internet of Things (IoT) products, they may be unaware of certain vulnerabilities and security features.
Application Note
Angle Error Correction with the A33230
This application note describes the mathematics to convert the analog sine/cosine outputs of the A33230 into an angular position.
Application Note
Using the A1335 in a Short Stroke Application
AN296166 - This application note is dedicated to short-stroke magnetic applications using Allegro angular position sensors based on circular vertical Hall (CVH) technology. Analyses and data used in this document are based on the A1335 angle sensor IC.
Application Note
Using the SENT Communications Output Protocol with A1341 and A1343 Devices
AN296108 - This application note provides a description of the Allegro implementation of the SENT protocol, which includes extensions developed by Allegro to enhance the information carrying dimensions of the output from the Allegro sensor IC to the vehicle electronic control units (ECU).