MLX92231-AAA-xxx
3-Wire Hall Effect Switch
Features and Benefits
Application Examples
Wide operating voltage range: from 2.7V to 24V
Accurate switching thresholds
Automotive, Consumer and Industrial
Solid-state switch
Reverse Supply Voltage Protection
Output Current Limit with Auto-Shutoff
Under-Voltage Lockout Protection
Thermal Protection
Traceability with integrated unique ID
High ESD rating / Excellent EMC performance
Thin SOT23 3L Green Compliant package
Brake sensor
Clutch sensor
Sunroof/Tailgate opener
Steering Column Lock
Open / Close detection
Ordering Information
Part No.
MLX92231LSE-AAA-xxx-RE
MLX92231LUA-AAA-xxx-BU
Temperature Code
L (-40°C to 150°C)
L (-40°C to 150°C)
Package Code
SE (TSOT-3L)
UA (TO-92)
Comment
RE (Reel)
BU (Bulk)
1 Functional Diagram
In addition to that an ID has been integrated on the IC
to have a complete traceability throughout the
process flow.
VDD
Voltage Regulator
Under-
with Reverse Polarity
Protection
Voltage
Lockout
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.
Temperature
Compensation
Bop/Brp
reference
Thermal
Protection
Switched
Hall
Plate
OUT
Open-Drain
Output
CDS
Amplifier
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.
Current
Limit &
Auto-Shutoff
Control
GND
2 General Description
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.
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).
390109223101 – REV 2
Page 1 of 12
Sept/14
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