MLX90248 View Datasheet(PDF) - Melexis Microelectronic Systems
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MLX90248 Datasheet PDF : 11 Pages
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MLX90248
Micropower & Omnipolar Hall Switch
9. Detailed General Description
The MLX90248 is originally used in mobile phone applications for open/close lid detection (flip, slide and swivel
phone type). The goal of this detection is to switch on or off the application if the lid is opened or closed, in order to
save battery power.
The same operation principle can be simply applied to any other battery-powered device with a lid/cover like laptop,
digital cameras and camcorders.
By the use of a very high sensitivity Hall sensor, a very small and cheap magnet is enough to trigger the MLX90248,
hence it can easily replace reed switch.
The major benefit of using a Hall sensor is to provide “electronic” commutation, which is bounce-free, more reliable
and with increased lifetime compared to usual mechanical contacts.
10. Unique Features
The MLX90248 exhibits “Omnipolar” magnetic characteristics. It means the device reacts to both North and South
magnetic pole. The purpose is to detect the presence of any magnetic field applied on the device.
This mode of operation simplifies customer production processes by avoiding the need to detect the Hall sensor pole
active on the magnet used in the application.
Taking the example of a generic Hall sensor “south pole active”, during its production, the customer must detect the
south pole of the application magnet and face it to the device to enable the output to be turned on and off. Without
any magnet pole detection system, the incorrect magnetic pole (north in this example) could be faced to the device
which would fail the application.
Therefore, the “Omnipolar” magnetic behavior helps customers by removing the need of magnet pole detection
system during production phase.
The “Micropower” feature makes the MLX90248 especially suitable for battery-powered device as it combines low
voltage operation and low current consumption. By using a sleep/awake strategy managed internally, the power
consumption is drastically reduced. To make a comparison, the MLX90248 consumes 100 times less power than the
generic low voltage Melexis Hall sensor US3881.
As well as Thin SOT package, the MLX90248 is now delivered in a UTQFN package. This new leadless package only
requires 3mm2 PCB surface and is 0.43mm maximum thick, which is particularly important in design where space-
saving and miniaturization are the critical factors.
REVISION 003 – JAN 17, 2018
390109024802
Page 5 of 11
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