Transmission Sensor ICs
Transmission Sensor ICs
Setting a New Standard in Transmission Speed Sensor Performance
Allegro offers the most comprehensive transmission speed sensor portfolio on the market. Using leading Hall and GMR technologies Allegro’s selection includes various output interfaces and protocols, SIP packages with magnet and protection component options, and optional ASIL reporting. Our transmission speed sensors are built with decades of system level expertise, providing industry leading vibration immunity and dynamic air gap capability. And our advanced dynamic algorithms compensate for system level disturbances, guaranteeing stable output in the presence of system anomalies.
Our latest offering is a back biased GMR gear tooth sensor IC for larger air gap performance without the sacrifice of industry leading performance capabilities our sensors are known for in transmission applications. And, with Safety in mind, all of our latest transmission speed sensor ICs are designed to ISO 26262—the first in the market.
Features include:
- Front and back-biased solutions for magnetic encoder or ferrous target sensing
- Two-and three-wire output protocols supporting speed, direction, and ASIL error reporting (optional)
- Integrated solutions include IC, magnet (optional), and EMC protection component(s) in a single overmolded miniature package
- Differential sensing offers inherent common-mode stray field immunity
- Low jitter for high edge accuracy
- Flexible orientation GMR technology for xMR or Hall replacement and application installation flexibility
- EEPROM enables factory traceability throughout the production process
Featured Products
ATS19480
Large Air Gap, GMR Speed Sensor IC for Gear Tooth Sensing
ATS19520
The ATS19520 is an advanced Hall-effect transmissions sensor that uses an integrated back-bias magnet to measure the speed and direction of rotating ferrous targets.
A19520
The A19520 is an advanced vibration-tolerant Hall-effect integrated circuit (IC) that measures the speed and direction of rotating targets, ideal for transmission applications.
Transmission Speed Sensor ICs Selection Guide
Selection & Solution Guides
Allegro Product Selection Guide (PDF)
Documentation & Resources
Application Note
Transmission Gear Tooth Sensing
AN296221 - In this application note learn how our industry-leading, time-proven algorithms included on our transmission ICs have been designed to handle the most stringent application conditions.
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.
Application Note
Target Design for Hall Transmission Sensors
AN296178 - This application note details the impact of multiple target design parameters on the maximum air gap achievable with Allegro’s ATS692LSH and ATS19520LSN transmission sensors, allowing for measurement of speed and direction of rotating targets.
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
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.
Application Note
A19520/ATS19520 Sensor IC Outputs Under Vibration Conditions
AN296232 - This application note details the Allegro A19520 and ATS19520 sensor IC outputs for general target and sensor vibration scenarios.
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.
Brochure
Brochure: State-Of-The-Art Back-Biased GMR Speed Sensing
Allegro pioneers the first back-biased GMR Sensor with 50% larger air gaps. This larger air gap operation enables smaller and lighter transmissions that achieve reduced fuel consumption to help meet today's fuel economy standards.
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.