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Hall sensor saves PCB space for car, industrial apps

22 Sep 2014

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Melexis Technologies NV has improved its MLX92242 Hall effect switch/latch IC, which offers end-of-line (EOL) programmability and support for 2-wire operation, with its latest version that the company said enables easier implementation and saves space. Working on its innovative 'No PCB' design concept, the MLX92242 has a built-in capacitor so that the device can be implemented directly into the design without inclusion of supplementary board level components, which would increase the overall dimensions and necessitate additional soldering.

The company achieves all this while still delivering identical performance and functionality to the original MLX92242, as well keeping the standard industry TO-92/UA package form factor, enabling drop-in replacement solutions, Melexis indicated.


As with the standard MLX92242, a Hall sensing element, a voltage regulator (covering 2.7-24V), a current sink-configured output driver and a series of sophisticated IC protection mechanisms (over-voltage, reverse voltage, thermal shutdown, etc.) are all included, plus an EEPROM via which EOL programming can be executed. The EEPROM allows suitable magnetic thresholds to be set for the particular application scenario, then subsequently locked. Alternatively pre-programming can be carried out by Melexis to customers' specifications. A magnetic switching range spanning from 1-64mT and a magnetic latching range of -64mT to 64mT is achievable. Also its temperature compensation capacity can counter the effects of magnetic drift, added the company.

Key uses for this device (as well as the standard MLX92242) are within the seat track position and seatbelt buckle latch detection systems needed to acquire vehicle occupancy data for maximising the effectiveness of air bag deployment, as well other applications such as electric power steering systems, door release latches and window lifter actuators. There are also broad spectrums of industrial applications for which it can be used.

The MLX92242 is housed in a single compact industry standard 3-pin TO-92-Flat package. The pin ordering has been changed so as to facilitate simpler connection. The VDD and GND pins are spaced 2.54mm apart so they match with legacy fitting configurations while also simplifying assembly directly to lead frames and insert moulded connectors. This means that lead forming, which could potentially compromise the device's operation is not necessary

As MLX92242 devices permit 2-wire operation, as opposed to a conventional 3-wire arrangement, while still delivering full diagnostic capabilities, they reduce the quantity of wiring required for implementation. This optimises them for space-constrained designs. They are highly robust devices, operating across a temperature range extending across -40°C to 150°C and exhibiting strong resilience to electro-static discharge (ESD) strikes, with more than 8kV human body mode ESD compliance.

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