MLX92221LSE-AAA-002
2-Wire Hall Effect Latch
Features and Benefits
Application Examples
Wide operating voltage range: from 2.7V to 24V
Very wide range for magnetic sensitivity
Chopper-stabilized amplifier stage
Automotive, Consumer and Industrial
Wiper motor
Window lifter
Programmable Built-in negative temperature coefficient
Reverse Supply Voltage Protection
Under-Voltage Lockout Protection
Thermal Protection
High ESD rating / Excellent EMC performance
Thin SOT23 3L Green Compliant package
Doorlock
Seatbelt buckle
Seat positioning
Sunroof/Tailgate opener
Electrical power steering
Ordering Information
Part No.
Temperature Code
Package Code
Comment
MLX92221LSE-AAA-002-RE
L (-40°C to 150°C)
SE (TSOT-3L)
RE (Reel) - BHFS
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 MLX92221 is the new generation Hall-
effect switch designed in mixed signal submicron
CMOS technology.
With switching magnetic characteristics the supply
current state is turned high by a sufficiently strong field
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 surfacemount process
390109222102 Rev. 1
Page 1 of 11
March/12
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