Monolithically integrated linear Hall sensor for ASIL D systems

infineon0619 At the Sensor + Test trade fair, Infineon is the first semiconductor manufacturer to bring a monolithically integrated linear Hall sensor onto the market that has been developed entirely in accordance with the ISO26262 safety standard for automotive applications: the "Xensiv TLE4999I3" enables the development of fault-tolerant systems with just one component that must meet the highest requirement level for functional safety (ASIL D).

These include, for example, electric steering systems, electric throttle valve system and pedal applications. The ISO26262 standard requires that a system function properly even if a single error occurs, for example, a module fails. With the help of the TLE4999I3, uninterrupted operation is possible at the system level. The device consists of a single silicon, on which two independent Hall elements are located. Their signal paths are designed separately. Internal control mechanisms already carry out a plausibility check of the sensor data within the block. In addition, the linear Hall sensor provides the system with extensive status information.

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In addition to functional safety, the TLE4999I3 offers very high magnetic sensitivity with a fault tolerance of less than 2%. The offset error drift of the main channel, also an important parameter for a magnetic sensor for determining the absolute position in a magnetic field, is a maximum of 100 μT. This makes it only half as high as comparable products. The values of these parameters apply over the entire temperature range and product life.

With the TLE4999I3, two magnetic ranges of ± 12,5 and 25 mT can be set. These low values allow the use of relatively small and therefore more cost-effective magnets. The block has a PSI5 communication interface.

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