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—ideal for applications demanding precise, contactless motion tracking.
Featured Products
A31015
The A31015 is a nanopower linear Hall sensor with an enable pin for full power control. It offers <1nA sleep current for maximum battery life.
CT130
The CT130 is a 1D linear TMR sensor that is sensitive in the Z axis and has very low noise, enabling a high signal-to-noise ratio (SNR).
CT120
The CT120 is a 1D rotational TMR sensor that is sensitive in the X/Y plane with very low linearity error and high temperature stability.
A31020 and A31021
Ultra-Low-Power, Programmable Linear Hall-Effect Sensors with SPI and I2C Interfaces
Product Selection Guide
Documentation & Resources
Application Note
Chopper-Stabilized Amplifiers With Track-and-Hold Signal Demodulator
The conventional signal demodulator of a chopper amplifier can be substituted by track-and-hold (T/H) and averaging functions. This arrangement provides offset cancellation without requiring low-pass filters and can ignore the residual offset generated by input spikes.
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
Position and Level Sensing Using Hall-Effect Sensing Technology
This paper introduces Hall-effect technology, then explores how it has been applied, in particular, differentiating between the primary types of Hall sensor ICs and the highly differentiated range of sensing behaviors they can support.
Application Note
Analysis of a Hall-Effect System With Two Linear Sensor ICs for 30 mm Displacement
In this application note we are investigating how to extend the displacement range for linear detection by using two sensor ICs, using typical Allegro™ MicroSystems devices as examples.
Application Note
Guidelines for Using Allegro Angular Sensors
Many applications in different industries, such as in industrial automation and automotive sensors and actuators, require monitoring the angle of a rotating shaft either in an on-axis or off-axis arrangement. This application note is dedicated to a review of on-axis magnetic applications.
Application Note
Microcontroller-Based Linearization of Angular Sensor ICs
AN296160 - Magnetic angle sensors are often a good choice for fast, reliable, contactless measurement of the angular position of a system, especially in dirty environments where optical encoders may not be a good fit.
Application Note
Omnipolar Switch Hall-Effect IC Basics
There are four general categories of Hall-effect IC devices that provide a digital output: unipolar switches, bipolar switches, omnipolar switches, and latches. Omnipolar switches are described in this application note.
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
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
Unipolar Hall-Effect Sensor IC Basics
There are four general categories of Hall-effect IC devices that provide a digital output: unipolar switches, bipolar switches, omnipolar switches, and latches. Unipolar switches are described in this application note.
Application Note
3D Linear or 2D Angle Sensing with the ALS31300 and ALS31313 Hall-Effect ICs
AN296140 - This application note describes the use of the ALS31300 and ALS31313 3D Linear Hall-Effect Sensor integrated circuits (ICs) from Allegro MicroSystems for 3D linear sensing and 2D angle sensing applications.
Application Note
A1340, A1341, and A1343 Sensor Temperature Compensation
AN296122 - Sensor output can change over temperature due to sensor imperfections or temperature-dependent properties of the magnetic system. The purpose of applying temperature compensation inside the sensor is to keep the sensor output value independent of the temperature and only dependent on the input magnetic field strength.
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
Non-Contact Based Controller Solutions
AN296227 - Implementing controller functions through non-contact solutions provides both performance and reliability advantages over typical contact-based input methods.
Application Note
Calculating Temperature Compensation Using A1342 Linear Hall-Effect Sensor ICs
AN296121 - This application note provides information on how to use A1342 customer-adjustable compensation parameters to reduce systems errors as a result of ambient temperature changes.