MLX90254 Rev005 Datasheet old 731 DownloadLink 4766

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)
Package Code
VA (4 leads)
1. Functional Diagram
2. Description
2
Voltage
Regulator
4
Filter
S . ( B1 - B2 )
Filter
3
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.
Pin 1 – Not used
Pin 2 – Vdd (Supply)
Pin 3 – Vss (Ground)
Pin 4 - Output
3901090254
Rev. 005
Page 1 of 9
Datasheet
Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
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
3901090254
Rev. 005
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Datasheet
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MLX90254
Differential Dynamic Hall Effect Sensor
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, VDD
24 V
Reverse Voltage Protection
-0.3 V
Output Current, IOUT
25 mA
Output Short-Circuit Current
150 mA
Output Voltage
24 V
Operating Temperature Range, TA
-40 °C to 150°C
Storage Temperature Range, TS
-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 absolutemaximum-rated conditions for extended periods may affect device reliability.
3901090254
Rev. 005
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Datasheet
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MLX90254
Differential Dynamic Hall Effect Sensor
5. MLX90254 Electrical Specifications
o
o
DC Operating Parameters TA = -40 C to 150 C, VDD = 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
70
mA
Output Short-Circuit Current Iscprot
Output state: ON
Vout > 2V
10
45
Output Leakage Current
Ileak
Output state: OFF
10
µA
Output Rise Time
Tr
Vout = 12 V
0.1
µs
0.5
µs
150
ms
30000
Hz
Rpull-up = 600 Ω
No Load Capacitor
Output Fall Time
Tf
Vout = 4.5 .. 24 V
Cload = 1 nF
Rpull-up = 1 kΩ
Startup Time (2)
Tpower-on
Frequency (3)
f
Supply Rise Time
Tsr
15
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.
3901090254
Rev. 005
Page 4 of 9
Datasheet
Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
6. MLX90254 Sensor Specific Specifications
o
o
DC Operating Parameters TA = -40 C to 150 C, VDD = 4V to 24V (unless otherwise specified)
Parameter
Symbol
Preinduction
BDC
Differential Induction(4)
Test Conditions
Min
Typ
Max
Units
-500
500
mT
∆BAC
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 lowpass 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
30
10
8
20
15
6
10
4
5
Output Voltage (Volt)
Magnetic Density Flux (mT)
25
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
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Datasheet
Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
8. Performance Graphs
Jitter vs. Airgap
150 Deg.C
1.00
1.00
0.08
0.08
0.06
0.06
Jitter (degree)
Jitter (degree)
Jitter vs. Airgap
25 Deg.C
0.04
0.02
0
0.04
0.02
0
0.4
0.8
1.2
1.6
2.0
0
2.4
Airgap (mm)
3901090254
Rev. 005
0
0.4
0.8
1.2
1.6
2.0
2.4
Airgap (mm)
Page 6 of 9
Datasheet
Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
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.
3901090254
Rev. 005
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Datasheet
Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
11.
Package Information
VA Package
Dimensions
5.33
5.43
5.08
5.24
VA Hall Plate / Chip
Location
J
1.22
1.32
3.76
3.86
2.250 +/-0
0.387
4.50
A
4.10
45 o X 1mm
0.289
Hall Plates size:
0.20 x 0.20
B
C
254BB
ZZZZZ
5o
5o
(2x)
(2x)
2.95+/-0.15
0.387
0.289
3. 46
3 .79
3. 30
3 .63
Marked
Surface
D
VA
F
All Dimensions in
millimeters
0.94+/- 0.15
G
0.22
A
1.20
E
1.10
REF
H
1.0
B
MAX
1
2
3
0.66
0.61
4
C
0.29
0.24
10.0
D
45 o
11.0
E
0.31
0.18
F
0.60
0.40
0.45
0.35
G
0.35
0.25
H
0.15
0.0
J
45 o
Notes:
1. Pinout:
Not Used
Pin 1
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) =Part Number MLX90254
= Version
2 last digit (BB)
Line 2:
5 digits (ZZZZZ)
=Lot Number
Back Side Marking
4 digits (YYWW)
=Date Code
3901090254
Rev. 005
Page 8 of 9
Datasheet
Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
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
E-mail: [email protected]
Phone: +1 603 223 2362
E-mail: [email protected]
ISO/TS16949 and ISO14001 Certified
3901090254
Rev. 005
Page 9 of 9
Datasheet
Jun/04