MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 1 of 9 Datasheet
Rev. 005 Jun/04
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. Temperature Suffix Package Code
MLX90254 L (-40°C to 150°C) VA (4 leads)
1. Functional Diagram
2
S . ( B1 - B2 ) Filter
Filter
4
Voltage
Regulator
3
Pin 1 – Not used
Pin 2 – Vdd (Supply)
Pin 3 – Vss (Ground)
Pin 4 - Output
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.
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 2 of 9 Datasheet
Rev. 005 Jun/04
TABLE OF CONTENTS
FEATURES AND BENEFITS .......................................................................................................................1
APPLICATIONS............................................................................................................................................ 1
ORDERING INFORMATION......................................................................................................................... 1
1.
FUNCTIONAL DIAGRAM...................................................................................................................1-1
2.
DESCRIPTION....................................................................................................................................2-1
3.
GLOSSARY OF TERMS .......................................................................................................................3
4.
ABSOLUTE MAXIMUM RATINGS .......................................................................................................3
5.
MLX90254 ELECTRICAL SPECIFICATIONS ...................................................................................... 4
6.
MLX90254 SENSOR SPECIFIC SPECIFICATIONS ............................................................................5
7.
GENERAL DESCRIPTION.................................................................................................................... 5
8.
PERFORMANCE GRAPHS...................................................................................................................6
9.
RELIABILITY INFORMATION...............................................................................................................7
10.
ESD PRECAUTIONS.............................................................................................................................7
11.
PACKAGE INFORMATION...................................................................................................................8
12.
DISCLAIMER......................................................................................................................................... 9
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 3 of 9 Datasheet
Rev. 005 Jun/04
3. Glossary of Terms
1 mT = 10 Gauss: Flux density units.
Pre-induction: the pre-induction is the magnetic field induced by the back bias magnet.
Operating point: the value of the differential flux density when the transistor output turns ON.
Release point: the value of the differential flux density when the transistor output turns OFF
Margin: the flux density of the magnetic field has to be higher or lower than the margin value to enable the
next toggling of the output.
4. Absolute Maximum Ratings
Supply Voltage, V
DD
24 V
Reverse Voltage Protection -0.3 V
Output Current, I
OUT
25 mA
Output Short-Circuit Current 150 mA
Output Voltage 24 V
Operating Temperature Range, T
A
-40 °C to 150°C
Storage Temperature Range, T
S
-55 °C to 165°C
Maximum Junction Temperature 175 °C
Magnetic Flux Density Infinite
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 4 of 9 Datasheet
Rev. 005 Jun/04
5. MLX90254 Electrical Specifications
DC Operating Parameters T
A
= -40
o
C to 150
o
C, V
DD
= 4V to 24V (unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Units
Supply Voltage Vs 4 12 24 V
Supply Current (1) Is 5 8.5 12 mA
Output Voltage Vout Output state: OFF 24 V
Output DC Current Iout Vout < 1V 25 mA
Output Saturation Voltage Vsat Output state: ON
Iout=25 mA
500 mV
Output Short-Circuit Current
Iscprot Output state: ON
Vout > 2V
10 45 70 mA
Output Leakage Current Ileak Output state: OFF 10 µA
Output Rise Time Tr Vout = 12 V
Rpull-up = 600 Ω
No Load Capacitor
0.1 µs
Output Fall Time Tf Vout = 4.5 .. 24 V
Cload = 1 nF
Rpull-up = 1 kΩ
0.5 µs
Startup Time (2) Tpower-on 150 ms
Frequency (3) f 15 30000
Hz
Supply Rise Time Tsr Vs = 0 .. 24 V 100 ns
(1) Supply current can rise-up to 20 mA max. in the 3-4 volts Vdd range.
(2) Start-up time : when the wheel has started spinning, the output signal appears after a few teeth but a
delay up to 150 ms could be seen before the highest accuracy/repeatability.
(3) The frequency is linked with the first order high pass filter with a cut-off frequency smaller than 20 Hz.
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 5 of 9 Datasheet
Rev. 005 Jun/04
6. MLX90254 Sensor Specific Specifications
DC Operating Parameters T
A
= -40
o
C to 150
o
C, V
DD
= 4V to 24V (unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Units
Preinduction B
DC
-500 500 mT
Differential Induction(4) ∆B
AC
6 100 mT
Operating Point Bop -0.5 0 0.5 mT
Release Point Brp -0.5 0 0.5 mT
Positive margin M + 0.5 2 3 mT
Negative margin M - -3 -2 -0.5 mT
Magnetic Hysteresis Bhyst 0 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
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10
Angle (Degree)
Magnetic Density Flux (mT)
-2
0
2
4
6
8
10
12
Output Voltage (Volt)
B1
B2
BAC
OUT
Figure 1: Output toggling according to the differential magnetic signal.
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 6 of 9 Datasheet
Rev. 005 Jun/04
8. Performance Graphs
Jitter vs. Airgap
25 Deg.C
1.00
0
Jitter (degree)
Airgap (mm)
1.2
0.02
0.04
0.06
0.08
0.80.40 1.6 2.0 2.4
Jitter vs. Airgap
150 Deg.C
1.00
0
Jitter (degree)
Airgap (mm)
1.2
0.02
0.04
0.06
0.08
0.80.40 1.6 2.0 2.4
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 7 of 9 Datasheet
Rev. 005 Jun/04
9. Reliability Information
This Melexis device is classified and qualified regarding soldering technology, solderability and moisture
sensitivity level, as defined in this specification, according to following test methods:
IPC/JEDEC J-STD-020
Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices
(classification reflow profiles according to table 5-2)
EIA/JEDEC JESD22-A113
Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing
(reflow profiles according to table 2)
CECC00802
Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed
Quality
EIA/JEDEC JESD22-B106
Resistance to soldering temperature for through-hole mounted devices
EN60749-15
Resistance to soldering temperature for through-hole mounted devices
MIL 883 Method 2003 / EIA/JEDEC JESD22-B102
Solderability
For all soldering technologies deviating from above mentioned standard conditions (regarding peak
temperature, temperature gradient, temperature profile etc) additional classification and qualification tests
have to be agreed upon with Melexis.
The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance
of adhesive strength between device and board.
Based on Melexis commitment to environmental responsibility, European legislation (Directive on the
Restriction of the Use of Certain Hazardous substances, RoHS) and customer requests, Melexis has
installed a Roadmap to qualify their package families for lead free processes also.
Various lead free generic qualifications are running, current results on request.
For more information on manufacturability/solderability see quality page at our website:
http://www.melexis.com/html/pdf/MLXleadfree-statement.pdf
10. ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 8 of 9 Datasheet
Rev. 005 Jun/04
11. Package Information
All Dimensions in
millimeters
VA Hall Plate / Chip
Location
VA Package
Dimensions
Notes:
1. Pinout: Pin 1 Not Used
Pin 2 Vdd
Pin 3 GND
Pin 4 Output
2. Controlling dimension: mm .
3. Leads must be free of flash and plating voids.
4. Leads must not arc toward the rear of package.
5. Package dimensions exclude molding flash.
6. Tolerance: +/- 0.254 mm unless otherwise specified.
7. Marking:
Line 1:
3 first digits (254)
2 last digit (BB) = Version
Line 2:
5 digits (ZZZZZ)
=Part Number MLX90254
Back Side Marking
=Lot Number
2.95+/-0.15
Hall Plates size:
0.20 x 0.20
0.94+/- 0.15
0.387
0.289
Marked
Surface
E
3.46
3.30
A
B
C
5o
(2x)
5o
(2x)
0.387
0.289
3.79
3.63
D
F
G
H
1.0
MAX
0.22
REF
0.45
0.35
4.50
4.10
45 o X 1mm
10.0
11.0
254BB
ZZZZZ
1 2 3 4
5.08
5.24
5.33
5.43
1.22
1.32 3.76
3.86
J
VA
1.20
1.10
0.66
0.61
0.29
0.24
45o
0.31
0.18
B
A
C
D
E
0.15
0.0
F
G
H
0.60
0.40
0.35
0.25
J 45o
4 digits (YYWW) =Date Code
2.250 +/-0
MLX90254
Differential Dynamic Hall Effect Sensor
3901090254 Page 9 of 9 Datasheet
Rev. 005 Jun/04
12. Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in
its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore,
prior to designing this product into a system, it is necessary to check with Melexis for current information.
This product is intended for use in normal commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or high reliability applications, such as military,
medical life-support or life-sustaining equipment are specifically not recommended without additional
processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not
be liable to recipient or any third party for any damages, including but not limited to personal injury,
property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or
use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow
out of Melexis’ rendering of technical or other services.
© 2002 Melexis NV. All rights reserved.
For the latest version of this document, go to our website at:
www.melexis.com
Or for additional information contact Melexis Direct:
Europe and Japan: All other locations:
Phone: +32 13 67 04 95 Phone: +1 603 223 2362
E-mail: sales_europe@melexis.com E-mail: sales_usa@melexis.com
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