Sensor self-diagnosis using multiple signal paths

Abstract

Embodiments relate to systems and methods for self-diagnosis and / or false detection using multiple signal paths in sensor and other systems. In one embodiment, a sensor system comprises at least two sensors such as magnetic field sensors, and separate signal paths which belong to each of the sensors. A first signal path can be coupled to a first sensor and a first digital signal processor (DSP), and a second signal path can be coupled to a second sensor and a second digital signal processor. A signal from the first digital signal processor can be compared with a signal from the second digital signal processor either on-chip or off-chip to detect defects, errors, and other information in connection with the operation of the sensor system. Embodiments of these systems and / or methods can be configured to satisfy or exceed relevant safety or other industry standards, such as safety integrity level (SIL) standards.

Description

[0001] relevant application

[0002] This application is a continuation-in-part (CIP) of US Application Serial No. 12 / 889,749, filed September 24, 2010, which is hereby incorporated by reference in its entirety. technical field

[0003] The present invention relates generally to integrated circuit (IC) sensors and more particularly to self-diagnostics of IC sensors using multiple communication signal paths. Background technique

[0004] As part of the development of automotive electronics, the recent trend in automotive drive technology is to build passive safety systems such as seat belts and airbags, through active safety systems such as anti-lock braking systems (ABS), electronic stability systems (ESP) and electric power steering to provide an increased range of driver assistance functions. As has been the case in powertrains for some time, system complexity is also increasing here in order to detect dangerous driving situations and help avoid accidents through active ...

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