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Large Air Gap, Vibration-Tolerant GMR Transmission Speed and Direction Sensor IC

A19571

High-Performance GMR AK Protocol Wheel Speed and Direction Sensor IC

A19571 ECAD Model
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Description

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Packaging

The A19571 is a magnetic sensor integrated circuit (IC) that uses giant magnetoresistance (GMR) technology to encode the speed and direction of rotating ring magnets. Using a state-ofthe-art GMR stack design integrated with a BiCMOS process, the IC differentially measures magnetic fields and applies advanced digital processing to robustly measure ring magnets commonly used in automotive transmissions.

The A19571 features Allegro’s SolidSpeed Digital Architecture™ for robust and reliable target tracking that adapts to changes in the air gap and the environment. Its advanced algorithms distinguish vibration from rotation to provide reliable speed and direction information to a controller.

The IC has been designed to a certified ISO 26262 design process to allow easy integration into high safety level systems. Integrated diagnostics are used to detect an IC failure that impacts the output protocol’s accuracy, providing coverage compatible with ASIL B compliance (pending assessment).

The A19571 is provided in a 2-pin miniature SIP package (suffix UB) that is lead (Pb) free, with tin leadframe plating. The UB package includes an IC and capacitor integrated into a single overmolded package, with an additional molded leadstabilizing bar for robust shipping and ease of assembly.
 
  • GMR technology delivers high magnetic sensitivity for large air gaps and minimal jitter
  • SolidSpeed Digital Architecture™ provides robust, adaptive performance with advanced algorithms that provide vibration immunity over the full target pitch
  • Flexible sensing orientation allows parallel or perpendicular placement to the magnet
  • ISO 26262 ASIL B with integrated diagnostics and certified safety design process (pending assessment)
  • Two-wire current source output with protocol options
  • EEPROM enables traceability throughout product life cycle

The A19571 is provided in a 2-pin miniature SIP package (suffix UB) that is lead (Pb) free, with tin leadframe plating. The UB package includes an IC and capacitor integrated into a single overmolded package, with an additional molded leadstabilizing bar for robust shipping and ease of assembly.

UB Package Documentation

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Part Number Specifications and Availability

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. 

Documentation and Resources

Documentation

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Documents Found: 32
Document Type Document Name
Application Note
Giant Magnetoresistance versus Hall-effect: A Comparison of Technologies for Speed Sensor Applications
Application Note
Fundamental Properties of Speed Sensors
Application Note
Understanding Input Signal Variation in Sensor ICs with SolidSpeed Digital Architecture