Hall sensor for safety-critical automotive torque-sensing applications

April 06, 2020 //By Christoph Hammerschmidt
Hall sensor for safety-critical automotive torque-sensing applications
Safety-critical automotive system such as electric power steering is the targeted field of application of Melexis’ new MLX91377 ASIL-ready Hall sensor IC. The device offers high linearity along with low drift.

With an ambient operating temperature up to 160°C and combining high linearity with excellent thermal stability, including low offset and sensitivity drift, the MLX91377 supports dependable torque sensing in EPAS (electric power-assisted steering systems) to enable safe control in conventional and autonomous driving.

Developed as a Safety Element Out of Context (SEooC), the MLX91377 complies with the ISO 26262 standard and is qualified to AEC Q-100 Grade 0. Supporting functional safety level ASIL-C in digital (SENT or SPC) mode and ASIL-B in analog mode, the MLX91377 offers a high level of functional safety, per die, and can detect internal failures and enter a safe state to prevent unintended vehicle behavior. The available dual die TSSOP-16 package further expands this by offering two fully redundant dies to enable support for safety critical applications like steering and braking systems.

In addition to functional-safety applications, the MLX91377 satisfies a variety of automotive and industrial contactless position-sensing use cases including steering torque sensors, acceleration, brake, or clutch pedal sensors, absolute linear position sensors, float-level sensors, non-contacting potentiometers, small-angle position sensors and small stroke position sensors.

The programmable measurement range and multi-point calibration enhance flexibility for designers, and the variety of output protocols enables one IC to be used in multiple applications reducing requalification efforts and costs. The Short PWM Code (SPC) protocol permits measurements to be taken and transmitted upon detection of a trigger pulse. Up to four MLX91377 sensors can be synchronized up to 2 kHz, enabling simultaneous magnetic measurements with deterministic latency to ensure high accuracy. In addition, the low-noise and high refresh rate allow high control-loop speeds enabling systems to deliver fast response times with minimal filtering.

More information: https://www.melexis.com/en/documents/documentation/datasheets/datasheet-mlx91377

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