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PDF MLX90254 Data sheet ( Hoja de datos )
| Número de pieza | MLX90254 | |
| Descripción | Differential Dynamic Hall Effect Sensor | |
| Fabricantes | Melexis | |
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MLX90254
Differential Dynamic Hall Effect Sensor
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
Applications
Crankshaft sensor
Camshaft sensor
ABS sensor
Gear tooth sensor
Speed sensor
Ordering Information
Part No.
MLX90254
Temperature Suffix
L (-40°C to 150°C)
1. Functional Diagram
2
Voltage
Regulator
S . ( B1 - B2 )
Filter
Filter
4
3
Pin 1 – Not used
Pin 2 – Vdd (Supply)
Pin 3 – Vss (Ground)
Pin 4 - Output
Package Code
VA (4 leads)
2. 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 air gaps 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.
3901090254
Rev. 005
Page 1 of 9
Datasheet
Jun/04
1 page  
www.DataSheet4U.com
MLX90254
Differential Dynamic Hall Effect Sensor
6. MLX90254 Sensor Specific Specifications
DC Operating Parameters TA = -40oC to 150oC, VDD = 4V to 24V (unless otherwise specified)
Parameter
Preinduction
Differential Induction(4)
Operating Point
Release Point
Positive margin
Negative margin
Magnetic Hysteresis
Symbol Test Conditions
BDC
∆BAC
Bop
Brp
M+
M-
Bhyst
Min Typ Max
-500 500
6 100
-0.5 0 0.5
-0.5 0 0.5
0.5 2
3
-3 -2 -0.5
0
Units
mT
mT
mT
mT
mT
mT
mT
(4) The differential field must exceed 6 mT to assure the switching of the output
7. General Description
Let us model the magnetic flux densities by sinusoids. If the wheel confirms a certain geometrical
property, the two Hall cells see two magnetic flux densities in phase opposition. They are illustrated by the
dashed sinusoid on figure 1.
The difference between the two Hall signals is computed and amplified. The remaining DC offset is
removed by the high-pass filter. The noise that is out of the signal bandwidth is attenuated by the low-
pass filter in order to minimize the output jitter.
The AC differential signal is compared to the Bop and Brp threshold and the result of that comparison
commands the open drain output transistor.
Output Voltage Vs the Angle
40 12
B1
B2
35
BAC
OUT 10
30
25
8
20
15 6
10
54
0
1 2 3 4 5 6 7 8 9 10 2
-5
-10
0
-15
-20 -2
Angle (Degree)
Figure 1: Output toggling according to the differential magnetic signal.
3901090254
Rev. 005
Page 5 of 9
Datasheet
Jun/04
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MLX90254.PDF ] | |
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