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MLX90254
Differential Dynamic Hall Effect Sensor
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MLX90254 General Description
The MLX90254 is a Differential Dynamic Hall Effect Sensor which has been developed for automotive crankshaft and ABS (anti-lock brake system) applications. The IC, combined with a magnet placed at his back, offers speed and position sensing of ferromagnetic tooth-wheels in dynamic operation (non zero speed). Its low hysteresis enables it to operate over a wide range of airgaps from -40°C to 150°C.
The use of two Hall cells makes the operation sensitive to a rotation of the IC around its normal axis.
The output structure is an Open-Drain NMOS transistor with a capability of 25 mA under 24V and protected against short-circuits. The IC is packaged in 4-SIP VA.
MLX90254 Features and Benefits
Differential hall sensor
Low consumption
Excellent repeatability performance
Large airgap range
Large supply voltage range
Distance between Hall plates : 2.25 mm
MLX90254 Applications
MLX90254 Documentation
DataSheet
File Type
Size
Revision
Date
Action
MLX90254_Rev005 Datasheet
PDF
119.9 KB
005
MLX90254 Tools
MLX90254 Environmental Information
Environmental Information
File Type
Size
Revision
Date
Action
Package Material Declaration - VA 6600CS LF - S3
PDF
103.1 KB
7.0
1/25/2012
RoHS Compliance Declaration MLX90254
PDF
37.5 KB
1.0
11/3/2009
This text will be replaced
MLX90254 In The Press
MLX90254 Frequently asked Questions
MLX90217 AS CRANK SENSOR..
Answer
In principle, the MLX90217 could be used for an active crankshaft position sensor. It will be able to deliver an electrical signal from the first-edge ("Zero-speed") up to 10000 RPM (i.e. 10 kHz input signal w/ Crank target 60-2 teeth) regardless of the direction. You will not be able to meet the repeatibility specification required by the engine management control unit and strategy. This is linked to the working principle of the MLX90217 i.e. a fully digital track-and-hold circuitry. For Crankshaft application, we recommend the MLX90254. This circuit is an AC-coupled differential Hall sensor. It can be used together w/ a back-bias magnet at the front of a ferromagnetic toothwheel. It can also be used at the front of a magnetic wheel. The AC-coupled differential circuitry allows the MLX90254 to meet extremely tight jitter specification compatible w/ the engine management requirements. However, it is not a zero-speed sensor.
MLX 90254 Inversion
Question
I am using 2 MLX90254 within 10mm of each other, both with magnets biased with south pole facing the unbranded side of the sensor. I will get inverting output signals sometimes with one or both sensors. The datasheet does not explain this. Can someone?
Magnet selection for Mlx90217 and Mlx90254
Question
My customer would like use MLX90217 for cam sensor and Mlx90254 for crankshaft sensor. And they don't very clear how to select magnet for these two chips. They ask for the documents about magnet selection for Mlx90217 and Mlx090254 and give the magnet and airgap vs. output signal curve. Would you please help me with this request?
Answer
Your question lacks some important details. The gear target geometry is equally important to the airgap vs. output signal curve. A typical magnet for use with the MLX90217 or MLX90254 might be something like a NeFeB material, grade N35 or better and in a 5mm dia. x 8mm length. A rare earth SmCo material would also work and might give better temperature performance especially above 125C, although a good, quality supplier of NeFeB would have grades of Neo materal to meet high temp requirements. I also encourage your customer to read thoroughly the datasheets on the products to better understand how magnet selecion affects performnce
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