New Gear Tooth Speed Sensor Assists Transmission Designers


The device’s industry-leading air gap enables increased reliability, efficiency and design flexibility, offering more design options

Measuring the rotation of ferromagnetic gears is the new ATS19480, a giant magnetoresistance (GMR) speed sensor by Allegro MicroSystems. It provides a single channel solution that’s ideal for hybrid and pure electric vehicle transmissions. Use cases include two-wheelers, off-road vehicles and industrial application designs requiring speed-only information. Leading automotive-grade algorithms and packaging technology enable the transmission sensor to addresses the needs of today’s system developers and manufacturers. 

A 50% larger air gap improves the ATS19480’s design-in flexibility, expands design margin and tolerance capability, and facilitates a wider range of sensor installation locations, reducing system complexity, size, weight, cost and energy consumption that boosts efficiency and minimises carbon footprints.

“Our new speed sensor allows designers to do things that haven’t been possible until now. It can be placed virtually anywhere; transmissions can be smaller and lighter than ever before, which is especially important in applications where designers want the speed-only protocol,” said Peter Wells, Business Unit Director at Allegro.

High Integration

Monolithic integration makes it possible for the ATS19480 sensor to achieve exceptional in-system performance and highly accurate speed detection. The fully integrated, single overmold package lessens design complexity and simplifies the development process.

For flexible design-in and system compensation, the three-pin single inline package (SIP) houses the IC, magnet and EMC protection. The precision assembly optimises IC-to-magnet positioning, as a reduced tolerance stack between the IC and magnet increases sensor accuracy and leaves ample margin for in-application installation tolerance.

Flatline conditions are eliminated by advanced signal compensation that occurs due to system dynamics while differential sensing protects against common-mode stray fields. The ATS19480 includes integrated ASIL B diagnostics and a certified safety design process for optional fault reporting Its superior operation under harsh operating conditions reduces failure rates—along with customer returns and warranty service claims.

The back-biased ATS19480 speed sensor IC is available now in a lead (Pb)-free, 3-pin SIP package (suffix SN) with tin leadframe plating. 






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