Magnetic position sensor meets ASIL-D

May 18, 2021 // By Christoph Hammerschmidt
Magnetic position sensor meets ASIL-D
Allegro MicroSystems has introduced a magnetic sensor IC that delivers the accuracy and performance needed to meet stringent ASIL-D requirements of safety-critical automotive applications. With its properties, the device is regarded as enabler for next-gen ADAS applications.

The A31315, as the newest member of Allegro’s 3DMAG family of rotary and linear magnetic position sensor ICs for automotive and industrial applications, addresses the performance and functional safety 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, says Allegro.   

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 3DMAG devices also support 3D magnetometer applications in which all three magnetic components (B X, B Y, B Z) are required to track complex magnetic movements.  

Addressing the critical safety needs of autonomous driving systems and ADAS applications, the 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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