New 3D Hall Sensor Series for Automotive Applications

TE Connectivity's new on-chip 3D Hall sensors offer technical and economic advantages over conventional Hall sensor designs. The new platform T40MC2 (linear) and R360MC2 (angular) products work with unusually compact permanent magnets, which helps bring down the cost of rare earth materials. As a rule of thumb, a target magnet in a linear Hall sensor application should measure at least 60% of the travel length. With its new 3D Hall sensors, TE Connectivity has reduced this requirement significantly: To detect 30 mm of linear travel, the new sensor can work with a 6 mm magnet, depending on the application.

This major advance makes it much easier to integrate a right-size permanent magnet inside a compact target system, thereby supporting increasingly dense packaging of components in modern cars. At the same time, the new 3D Hall sensor offers increased linearity. As the new sensor measures two magnetic field vectors (Y and Z axes) instead of absolute magnetic flux, it delivers a good linear signal even in the boundary areas of the travel path. Moreover, the non-contact desgn principle supports applications that necessitate a larger distance between target magnet and sensor. Its superior vibration resistance is yet another benefit of 3D field vector measuring.

Because of its non-contact measurement principle, the sensor can be fully encapsulated which makes it very robust in harsh environments. It neither interacts with the target system nor is it subject to mechanical wear, resulting in excellent durability. The sensor permits a temperature range of up to 150 °C. Its ASIC can provide position information within <1 microsecond. Under nominal conditions the integrated signal processing has a linearity error of considerably less than 1%. To adapt the sensor to individual applications, integrated EEPROMs can be parameterized. The sensor provides up to three programmable signal outputs as a PWM signal and/or as switched outputs.

As position detection can be safety-critical in automotive applications, the new TE 3D Hall sensor meets the ASIL-B standard (ISO 26262, functional safety). To make wiring easier, the sensor does not require a separate voltage supply, but can be operated with 12 volts. An energy-efficient sleep mode makes it possible to keep the sensor connected to the battery at all times for applications such as brake cylinder detection.

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