Allegro MicroSystems, Inc. recently announced the release of the A31315 sensor, the newest member of the 3DMAG™ family of rotary and linear magnetic position sensor ICs for automotive and industrial applications. 3DMAG sensors combine Allegro’s proven planar and vertical Hall-effect technologies to measure magnetic field components along three axes (X, Y, Z), enabling true 3D sensing capabilities with a wide magnetic dynamic range without saturation.

Continued advancements in advanced driver assistance systems (ADAS) and autonomous driving systems present new performance and functional safety challenges for system integrators. The A31315 sensor addresses these challenges by delivering the measurement accuracy and performance necessary to meet the stringent requirements of safety-critical automotive applications including steering, braking, transmission and throttle systems.

The sensors’ flexible 3D Hall front end and configurable signal processing architecture enable highly accurate, absolute linear position and rotary position measurements up to 360° while easing system integration challenges by providing greater freedom in sensor placement. Existing Allegro 3DMAG devices, such as the ALS31300 and ALS31313 sensors, also support 3D magnetometer applications in which all three magnetic components (BX, BY, BZ) are required to track complex magnetic movements. 

“Building on Allegro’s decades of automotive magnetic sensing innovation, the 3DMAG family expands our range of industry-leading position sensing solutions to include virtually any moving magnet system while offering the performance and functional safety capabilities required to enable the next generation of ADAS solutions,” said Scott Milne, Business Unit Director for Magnetic Position Sensors at Allegro MicroSystems. “ADAS is a key growth engine for the automotive industry, and our early position in this market—combined with a robust new product pipeline—provides our customers with the sensing solutions they need to accelerate the adoption of ADAS features in smart, autonomous vehicles.”

Addressing the critical safety needs of autonomous driving systems and ADAS applications, the highly accurate A31315 position sensor contains advanced on-chip diagnostic features to ensure reliable, safe operation. It supports both rotary and linear position sensing in a robust design with excellent native angle error over temperature in any plane (<1.2° over the sensor’s full -40°C ~ +150°C operating range). Following Safety Element out of Context (SEooC) functional safety guidelines, the A31315 sensor supports ASIL-B (single die) and ASIL-D (dual die) system-level integration in accordance with ISO 26262 and is automotive qualified to AEC-Q100 Grade 0.

The A31315 sensor is available as a single die in a compact SOIC-8 package, and as a fully redundant stacked dual die in a TSSOP-14 package for applications requiring redundancy or higher levels of measurement. Unlike traditional side-by-side dual die configurations, Allegro’s stacked die construction closely aligns the sensing elements of both die, ensuring the measurement of nearly identical magnetic fields. This innovative design enables the dual-die A31315 sensor to offer superior channel matching performance and tighter channel comparison thresholds common in fully redundant safety systems.

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