MLX90248 Datasheet, PDF (1/11 Pages) Melexis Microelectronic Systems – Micropower & Omnipolar Hall Switch

MLX90248
Micropower & Omnipolar™ Hall Switch
Features and Benefits
Micropower consumption ideal for battery-
powered applications
Omnipolar, easy to use as output switches
with both North and South pole
Ultra-Thin QFN package (0.43mm max) &
Thin SOT23 3L (both RoHS Compliant)
Very High Sensitivity Hall Sensor
Chopper stabilized amplifier stage
Operation down to 2.5V
Application Examples
Solid State Switch
Handheld Wireless Handset Awake Switch
Lid close sensor for battery-powered devices
Magnet proximity sensor for reed switch
replacement in low duty cycle applications
Ordering Information
Part No.
MLX90248
MLX90248
Temperature Code
E (-40°C to 85°C)
E (-40°C to 85°C)
Package Code
SE (TSOT-3L)
LD (UTQFN-6L)
1 Functional Diagram
2 General Description
The MLX90248 Omnipolar^TM Hall effect sensor IC
is fabricated from mixed signal CMOS technology.
It incorporates advanced chopper-stabilization
techniques to provide accurate and stable
magnetic switch points.
The circuit design provides an internally controlled
clocking mechanism to cycle power to the Hall
element and analog signal processing circuits.
This serves to place the high current-consuming
portions of the circuit into a “Sleep” mode.
Periodically the device is “Awakened” by this
internal logic and the magnetic flux from the Hall
element is evaluated against the predefined
thresholds. If the flux density is above or below the
Bop/Brp thresholds then the output transistor is
driven to change states accordingly. While in the
“Sleep” cycle the output transistor is latched in its
previous state. The design has been optimized for
service in applications requiring extended
operating lifetime in battery powered systems.
The output transistor of the 90248 will be latched
on (BOP) in the presence of a sufficiently strong
South or North magnetic field facing the marked
side of the package. The output will be latched off
(BRP) in the absence of a magnetic field.
3901090248
Rev 012
Page 1 of 11
Data Sheet
Sept/06