Redundant and Diverse Magnetic Field Digital Linear Hall Sensor Concept for ASIL D Applications

Paper #:
  • 2017-01-0053

Published:
  • 2017-03-28
Abstract:
Authors: DI(FH) Wolfgang Granig, Infineon Technologies Austria AG Dr. Friedrich Rasbornig, Infineon Technologies Austria AG Dr. Dirk Hammerschmidt, Infineon Technologies Austria AG DI Mario Motz, Infineon Technologies Austria AG Abstract: Functional safe products fulfilling the ISO26262 standard are getting more important for automotive applications where additional redundant and diverse functionality is needed for higher rated ASIL levels. This can result in a very complex and expensive system setup. Here we show a two channel redundant and also diverse implemented magnetic field sensor concept on one silicon die, which is used for ASIL D applications like power-steering torque measurement. This solution is beneficial because of implementation on a single chip in one chip-package but anyway fulfilling ASIL D requirements. The detailed concept will be described in this paper containing following methodologies and technologies: - Two independent linear Hall magnetic field measurement signal paths - Diverse signal path characteristics (slope, sensitivity, noise) - Temperature and mechanical chip-stress compensated output signal for high accurate outputs resulting in a small deviation for an external safety mechanism comparing the two outputs with tight limits achieving high diagnostic coverage - Diverse implementation of compensation signal ranges and slopes for temperature and stress signals - Two independent hardware signal processing units and program ROMs for both signal paths - Diverse implementation of firmware on algorithmic and timing level to avoid systematic failures - Independent mapping of two signal path outputs onto one single interface protocol including sufficient diagnostic coverage and independence, which saves a complex second independent interface. - Internal Safety Mechanisms for supply-monitoring, signal and data plausibility checks and configuration data redundancy checks - External Safety Mechanisms easy to implement by the System-Integrator like output data comparison or interface response and CRC checks
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