Configure your ideal sensor with factory-programmable digital Hall effect devices

December 23, 2013 // By Graham Prophet
Melexis Technologies has introduced two parts to its programmable digital Hall effect sensor line; MLX92231 and MLX92211 feature EEPROM memory, allowing magnetic switching thresholds to be configured (including hysteresis). Both are factory pre-programmed to precise Hall effect switch or latch specifications, bringing tailored results that match your specific application requirements.

MLX92211 targets applications requiring Hall effect latch magnetic characteristics. MLX92231 supports applications for Hall effect switch magnetic behaviour. A 32 bit unique ID code in each sensor gives lifetime traceability.

Constructed on a proprietary mixed signal CMOS process technology, the MLX92231 and MLX92211 ICs integrate a Hall sensor element with advanced offset cancellation mechanism, a voltage regulator and an open-drain output driver in industry standard 3-pin SIP and TSOT23 packages. The programmable architecture enables high accuracy switching thresholds and an integrated factory programmed thermal compensation value to be set. These features simplify manufacturing of precision, thermally stable sensor modules using low cost magnet materials, while avoiding complex, expensive temperature testing.

Covering a wide operational voltage range (2.7 to 24V) and supporting an extensive operational temperature range (-40°C to +150°C), these AEC-Q100-qualified devices are suited to use in the most demanding of automotive and industrial settings. Output current limit, under-voltage lockout and thermal shutdown ensure on-going reliability, while also lowering the overall bill of materials required. Target automotive applications for the MLX92231 and MLX92211 include seat positioning systems, clutch position sensors, or brake light sensors. Both ICs are also suitable for industrial position sensing roles in robotics, factory automation equipment, material handling, valve positions and process controls.

The devices both feature a low voltage capability, differentiating them from other Hall effect sensors, by allowing them to interface with microcontrollers and other digital ICs placed on supply lines at under 3V. A built-in reverse voltage protection feature does not require a serial resistor or diode on the supply line, so that even remote sensors can be specified for low voltage operation down to 2.7V while still being reverse voltage tolerant.