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Highly integrated Hall-effect sensor meets ASIL D

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By Christoph Hammerschmidt

The XENSIV TLE4999I3 enables the development of fault-tolerant systems with a single component, which must meet the highest functional safety requirement (ASIL D). Applications include, for example, electric steering systems, electric throttle valve systems and pedal applications.

The ISO26262 standard requires a system to function correctly even if a single fault occurs, for example if a component fails. The TLE4999I3 thus enables uninterrupted operation at system level. The device consists of a single silicon crystal on which two independent Hall elements are located. Their signal paths are separate from each other. Internal control mechanisms already carry out a plausibility check of the sensor data within the device. In addition, the new linear Hall sensor provides the system with extensive status information.

In addition to functional safety, the TLE4999I3 offers high magnetic sensitivity with an error 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, amounts to a maximum of 100 µT. This is only half as high as for comparable products. The values of these parameters apply over the entire temperature range and the product service life.


With the TLE4999I3, two magnetic ranges of ±12.5 mT and 25 mT can be set. These low values make it possible to use relatively small and thus inexpensive magnets. 

The device has a PSI5 communication interface. From a physical point of view, it is a current interface whose advantages are low wiring effort and excellent electromagnetic performance. The TLE4999I3 is well suited for applications in which it is connected to the control unit over long distances: it supports cable lengths up to 12m.

The TLE4999I3 sensor is housed in a PG-SSO-3 package, which offers a high degree of design flexibility with its small footprint and design. The device is qualified according to AEC-Q100 Grade 0 and can therefore also be used in applications with permanent ambient temperatures of 150°C. The PG-SSO-3 package is designed for use in applications with high ambient temperatures.

Further information: www.infineon.com/linear-hall


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