Allegro MicroSystems ATS19581 GMR Gear Tooth Sensor

Allegro MicroSystems ATS19581 Giant Magnetoresistance (GMR) Gear Tooth Sensor offers an extensive feature set for high flexibility, reliability, and performance levels in transmission applications. This sensor IC is specifically designed for automotive transmission applications, including Electric Vehicles (EVs), where speed/speed and direction information is required using ferromagnetic gear-tooth targets. The ATS19581 gear tooth sensor is built on SolidSpeed digital architecture from Allegro and state-of-the-art GMR technology to offer robust and reliable gear tooth sensing.

Features

GMR technology senses ‘at near’ or ‘far’ air gaps for optimal design-in flexibility
Integrated EMC circuit protects against harsh supply line transients eliminating the need for a large bypass capacitor and twisted pair harness
System compensation for vibration, mechanical shifts, and thermal gradients to ease controller burden and increase signal reliability
Single-in-line overmolded package reduces tolerance stack of GMR IC, EMC protection, and magnet

Test pin access for system characterization within the application environment
Speed or Speed and Direction output protocol allows a single qualification to cover multiple applications
IC measures differentially to reject common-mode stray magnetic fields
Orientation compatible with Hall-effect technology for ease of drop-in replacement in existing designs
Integrated ASIL diagnostics and certified safety design process (optional fault reporting)

Functional Block Diagram with Application Circuit

Block Diagram - Allegro MicroSystems ATS19581 GMR Gear Tooth Sensor

The ATS19581 GMR sensor is capable of compensating for system dynamics such as startup and running mode vibration, mechanical air gap jumps, and thermal gradients. Two available air gap ranges maximize installation flexibility and compatibility for small, spatially constrained systems. The ATS19581 is provided in a single overmolded Lead (Pb) free 3-pin SIP package (ST) with tin lead-frame plating.

Allegro MicroSystems ATS19581 GMR Gear Tooth Sensor

Features

Functional Block Diagram with Application Circuit

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