MLX92221-AAA
2-Wire Hall Effect Latch
Features and Benefits
Application Examples
Wide operating voltage range: from 2.7V to 24V
Integrated self-diagnostics
Automotive, Consumer and Industrial
Wiper motor
Chopper-stabilized amplifier stage
Programmable Built-in negative temperature coefficient
Reverse Supply Voltage Protection
Under-Voltage Lockout Protection
Thermal Protection
Window lifter
Seatbelt buckle
Seat positioning
Sunroof/Tailgate opener
Electrical power steering
High ESD rating / Excellent EMC performance
Ordering Information
Part No.
Temperature Code
Package Code
Comment
BU (Bulk)
RE (Reel)
MLX92221LUA-AAA-xxx-BU
MLX92221LSE-AAA-xxx-RE
L (-40°C to 150°C)
L (-40°C to 150°C)
UA (TO92-3L)
SE (TSOT-23)
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.
1 Functional Diagram
VDD
Voltage Regulator
with Reverse Polarity
Protection
Under-
Voltage
Lockout
TEST
Temperature
Compensation
Bop/Brp
reference
Thermal
Protection
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 measurement result.
Switched
Hall
Plate
Output
Current Sink
CDS
Amplifier
Trimming
Register
Control
GND
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.
2 General Description
The Melexis MLX92241 is a new generation of Hall-
effect switches designed in mixed signal submicron
CMOS technology.
With latching magnetic characteristics the supply
current state is turned high by a sufficiently strong
South Pole facing the package branded side. Toggling
the state of the supply current from high to low is
possible by applying low or no magnetic field.
The device integrates a voltage regulator, Hall sensor
with advanced offset cancellation system and a current
sink-configured output driver, all in a single package.
Based on a brand new 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 temperature coefficient is implemented to
compensate the natural behaviour of certain types of
magnets becoming weaker with rise in temperature.
The MLX92221 is delivered in a Green and RoHS
compliant Plastic Single-in-Line (TO-92 flat) for
through-hole mount or PCB-less design or in 3-pin Thin
Small Outline Transistor (TSOT) for surface mount
process
390109224100 Rev. 1
Page 1 of 14
June/13
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