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MLX90248

Melexis Microelectronic Systems
Part Number MLX90248
Manufacturer Melexis Microelectronic Systems
Description Micropower & Omnipolar Hall Switch
Published May 26, 2009
Detailed Description MLX90248 Micropower & Omnipolar™ Hall Switch Features and Benefits Micropower www.datasheet4u.com consumption ideal for ...
Datasheet PDF File MLX90248 PDF File

MLX90248
MLX90248

Overview
MLX90248 Micropower & Omnipolar™ Hall Switch Features and Benefits Micropower www.
datasheet4u.
com consumption ideal for batterypowered 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 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.
TM 3901090248 Rev 012 Page 1 of 11 ...


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