Hall-Effect Sensors
Theory and Application

Every engineer needs to know about Hall effect sensors- one of the most common sensors on the market.

Edward Ramsden (Author)

9780750679343, Elsevier Science

Hardback, published 23 March 2006

272 pages, Approx. 100 illustrations
22.9 x 15.1 x 2.2 cm, 0.66 kg

Without sensors most electronic applications would not exist—sensors perform a vital function, namely providing an interface to the real world. Hall effect sensors, based on a magnetic phenomena, are one of the most commonly used sensing technologies today. In the 1970s it became possible to build Hall effect sensors on integrated circuits with onboard signal processing circuitry, vastly reducing the cost and enabling widespread practical use. One of the first major applications was in computer keyboards, replacing mechanical contacts. Hundreds of millions of these devices are now manufactured each year for use in a great variety of applications, including automobiles, computers, industrial control systems, cell phones, and many others. The importance of these sensors, however, contrasts with the limited information available. Many recent advances in miniaturization, smart sensor configurations, and networkable sensor technology have led to design changes and a need for reliable information. Most of the technical information on Hall effect sensors is supplied by sensor manufacturers and is slanted toward a particular product line. System design and control engineers need an independent, readable source of practical design information and technical details that is not product- or manufacturer-specific and that shows how Hall effect sensors work, how to interface to them, and how to apply them in a variety of uses. This book covers:• the physics behind Hall effect sensors• Hall effect transducers• transducer interfacing• integrated Hall effect sensors and how to interface to them• sensing techniques using Hall effect sensors• application-specific sensor ICs• relevant development and design toolsThis second edition is expanded and updated to reflect the latest advances in Hall effect devices and applications! Information about various sensor technologies is scarce, scattered and hard to locate. Most of it is either too theoretical for working engineers, or is manufacturer literature that can’t be entirely trusted. Engineers and engineering managers need a comprehensive, up-to-date, and accurate reference to use when scoping out their designs incorporating Hall effect sensors.

1. Hall Effect Physics
The theory and math behind the Hall effect.
2. Practical Hall Effect Transducers
Key characteristics, integrated Hall transducers, transducer geometry, examples.
3. Transducer Interfacing
Modeling Hall transducers, biasing, amplifiers, temp. compensation, offset adjustment.
4. Integrated Sensors, Linear and Digital Devices
Linear sensors, switches and latches, speed sensors, application-specific devices.
5. Interfacing to Integrated Hall Sensors
Interface issues, line driver circuits, the pull-up resistor, interfacing to standard logic devices, discrete logic, driving loads, LED interface, incandescent lamps, relays, solenoids, and inductive loads, wiring reduction schemes, encoding and serialization, digital to analog encoding, voltage regulation and power management.
6. Proximity Sensing Techniques
Head-on sensing, slide-by sensing, magnet null-point sensing, float-level sensing, linear position sensing, rotary position sensing, Vane switches,
7. Current Sensing
Resistive current sensing, free-space current sensing, toroidal current sensors, digital current sensor, closed-loop current sensors.
8. Speed and Timing Sensors
Competitive technologies, magnetic targets, vane switches, geartooth sensing, single-point sensing, differential fixed threshold, differential variable-threshold, speed and direction sensing.
9. Application-Specific Hall Sensor ICs
Micro-power switches, two-wire switches, networkable sensors, power devices, smart motor control.
10. Development Tools for Hall Effect Sensors
Electronic bench equipment, magnetic instrumentation, mechanical tools, magnetic simulation software.
Appendix A. Brief Introduction to Magnetics
Appendix B. Suppliers List
Glossary
References and Bibliography
Index

Subject Areas: Applied optics [TTB], Microprocessors [TJFD1], Electronics engineering [TJF], Electrical engineering [THR], Precision instruments manufacture [TDPB], Geographical information systems [GIS & remote sensing RGW]