2-Wire Hall Effect Switch
4. Functional Diagram
with Reverse Polarity
5. General Description
The Melexis MLX92241 is based on the Melexis Hall-effect latest platform, designed in mixed signal submicron
The device integrates a voltage regulator, Hall sensor with advanced offset cancellation system and a current sink-
configured output driver and integrated capacitor all in a single package.
Based on the proven in use platform, the magnetic core is using an improved offset cancellation system allowing
faster and more accurate processing while being temperature insensitive and stress independent. In addition a
pre-programmable temperature coefficient is implemented to compensate the natural behavior of certain types
of magnets becoming weaker with rise in temperature.
The included voltage regulator operates from 2.7 to 24V, hence covering a wide range of applications. With the
built-in reverse voltage protection, a serial resistor or diode on the supply line is not required so that even remote
sensors can be specified for low voltage operation down to 2.7V while being reverse voltage tolerant.
In an event of a drop below the minimum supply voltage during operation, the under-voltage lock-out protection
will automatically freeze the device, preventing the electrical perturbation to affect the magnetic measurement
circuitry. The output current state is therefore only updated based on a proper and accurate magnetic
The two-wire interface not only saves one wire, but also allows implementation of diagnostic functions as reverse
polarity connection and malfunction detection.
The on-chip thermal protection also switches off the output if the junction temperature increases above an
abnormally high threshold. It will automatically recover once the temperature decreases below a safe value.
The MLX92241 is delivered in a Green and RoHS compliant Plastic Single-in-Line (TO-92) for through-hole mount,
or in 3-pin Thin Small Outline Transistor (TSOT) for surface mount process.
Rev.002 - Sep 2019
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