MLX92231-AAA-xxx 3-Wire Hall Effect Switch Datasheet 1 Features and Benefits 2 Application Examples Wide operating voltage range: from 2.7V to 24V Automotive, Consumer and Industrial Accurate switching thresholds Solid-state switch Reverse Supply Voltage Protection Brake sensor Output Current Limit with Auto-Shutoff Clutch sensor Under-Voltage Lockout Protection Sunroof/Tailgate opener Thermal Protection Steering Column Lock Traceability with integrated unique ID Open/Close detection High ESD rating / Excellent EMC performance 3 Ordering Information Product Code Temperature Code Package Code Option Code Packing from Code RE MLX92231 L SE AAA-0xx BU MLX92231 L UA AAA-0xx RE MLX92231 L SE AAA-2xx BU MLX92231 L UA AAA-2xx Legend: Temperature Code: L (-40C to 150C) Package Code: SE = TSOT-3L / UA = TO92-3L Option Code: 0xx => Perpendicular sensitive 2xx => Lateral sensitive (IMC version) Packing Form: RE = Reel BU=Bulk Ordering Example: MLX92231LSE-AAA-003-RE Rev.010 April 2021 390109223101 Page 1 of 22 MLX92231-AAA-xxx 3-Wire Hall Effect Switch Datasheet 4 Functional Diagram VDD Voltage Regulator Under- with Reverse Polarity Voltage Protection Lockout Temperature Bop/Brp Thermal Compensation reference Protection Switched OUT Open-Drain Hall Output Plate CDS Amplifier Current Limit & Control Auto-Shutoff GND 5 General Description The Melexis MLX92231 is a Hall-effect unipolar switch designed in mixed signal CMOS technology. The device integrates a voltage regulator, Hall sensor with advanced offset cancellation system, automotive qualified EEPROM and an open-drain output driver, all in a single package. Based on the existing robust 922xx platform, the magnetic core has been equipped with a non-volatile memory that is used to accurately trim the switching thresholds and define the needed output magnetic characteristics (TC, BOP, BRP, Output pole functionality). In addition to that an ID has been integrated on the IC to have a complete traceability throughout the process flow. 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 the 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 state is therefore only updated based on a proper and accurate magnetic measurement result. The chopper-stabilized amplifier uses switched capacitor techniques to suppress the offset generally observed with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to smaller chip size and lower current consumption than bipolar technology. The small chip size is also an important factor to minimize the effect of physical stress. This combination results in more stable magnetic characteristics and enables faster and more precise design. The open drain output is fully protected against short-circuit with a built-in current limit. An additional automatic output shut- off is activated in case of a prolonged short-circuit condition. A self-check is then periodically performed to switch back to normal operation if the short-circuit condition is released. 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. Rev.010 April 2021 390109223101 Page 2 of 22