Programmable Hall sensor supports 2-wire operation

September 17, 2014 // By Julien Happich
Extending Melexis' innovative 'No PCB’ design concept, the new MLX92242 programmable Hall sensor has a built-in capacitor, so it can be implemented directly into a design without inclusion of supplementary board level components.

It 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.

As with the standard MLX92242, a Hall sensing element, a voltage regulator (covering 2.7V to 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 memory for End-of-Line (EOL) programming.

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 1mT to 64mT and a magnetic latching range of -64mT to 64mT is achievable. Also its temperature compensation capacity can counter the effects of magnetic drift.

Key uses for this device are within the seat track position and seatbelt buckle latch detection systems needed to acquire vehicle occupancy data for maximizing the effectiveness of air bag deployment, as well other applications like electric power steering systems, door release latches and window lifter actuators.

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 that they match with legacy fitting configurations while also simplifying assembly directly to leadframes and insert molded connectors

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 optimizes 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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