A19571: Large Air Gap, Vibration-Tolerant GMR Transmission Speed and Direction Sensor IC

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.