View MLX90254_4140478.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 to 150C) C Package Code VA (4 leads)
1. Functional Diagram
2
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 to 150C. 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.
Voltage Regulator
4
Filter S . ( B1 - B2 ) Filter
3
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. 2. 3. 4. 5. 6. 7. 8. 9. FUNCTIONAL DIAGRAM................................................................................................................... 1-1 DESCRIPTION.................................................................................................................................... 2-1 GLOSSARY OF TERMS ....................................................................................................................... 3 ABSOLUTE MAXIMUM RATINGS ....................................................................................................... 3 MLX90254 ELECTRICAL SPECIFICATIONS ...................................................................................... 4 MLX90254 SENSOR SPECIFIC SPECIFICATIONS ............................................................................ 5 GENERAL DESCRIPTION .................................................................................................................... 5 PERFORMANCE GRAPHS................................................................................................................... 6 RELIABILITY INFORMATION............................................................................................................... 7
10. ESD PRECAUTIONS............................................................................................................................. 7 11. PACKAGE INFORMATION................................................................................................................... 8 12. DISCLAIMER ......................................................................................................................................... 9
3901090254 Rev. 005
Page 2 of 9
Datasheet Jun/04
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 Reverse Voltage Protection Output Current, IOUT Output Short-Circuit Current Output Voltage Operating Temperature Range, TA Storage Temperature Range, TS Maximum Junction Temperature Magnetic Flux Density 24 V -0.3 V 25 mA 150 mA 24 V -40 C to 150C -55 C to 165C 175 C 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
Page 3 of 9
Datasheet Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
5. MLX90254 Electrical Specifications
DC Operating Parameters TA = -40 C to 150 C, VDD = 4V to 24V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max
o o
Units
Supply Voltage Supply Current (1) Output Voltage Output DC Current Output Saturation Voltage
Vs Is Vout Iout Vsat Output state: OFF Vout < 1V Output state: ON Iout=25 mA Output state: ON Vout > 2V Output state: OFF Vout = 12 V Rpull-up = 600 No Load Capacitor
4 5
12 8.5
24 12 24 25 500
V mA V mA mV mA A s
Output Short-Circuit Current Iscprot Output Leakage Current Output Rise Time Ileak Tr
10
45
70 10 0.1
Output Fall Time
Tf
Vout = 4.5 .. 24 V Cload = 1 nF Rpull-up = 1 k
0.5
s
Startup Time (2) Frequency (3) Supply Rise Time
Tpower-on f Tsr Vs = 0 .. 24 V 15 100
150 30000
ms Hz 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
DC Operating Parameters TA = -40 C to 150 C, VDD = 4V to 24V (unless otherwise specified) Parameter Preinduction Differential Induction(4) Operating Point Release Point Positive margin Negative margin Magnetic Hysteresis Symbol BDC BAC Bop Brp M+ MBhyst Test Conditions Min -500 6 -0.5 -0.5 0.5 -3 0 0 2 -2 0 Typ Max 500 100 0.5 0.5 3 -0.5 Units mT mT mT mT mT mT mT
o o
(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 35 30 25 Magnetic Density Flux (mT) 8 20 15 10 5 0 1 -5 -10 0 -15 -20 Angle (Degree) -2 2 3 4 5 6 7 8 9 10 2 4 Output Voltage (Volt) 12
B1 B2 BAC OUT
10
6
Figure 1: Output toggling according to the differential magnetic signal. 3901090254 Rev. 005 Page 5 of 9 Datasheet Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
8. Performance Graphs
Jitter vs. Airgap 25 Deg.C
Jitter vs. Airgap 150 Deg.C
1.00
1.00
0.08
0.08
Jitter (degree)
0.04
Jitter (degree)
0.06
0.06
0.04
0.02
0.02
0
0
0.4
0.8
1.2
1.6
2.0
2.4
0
0
0.4
0.8
1.2
1.6
2.0
2.4
Airgap (mm)
Airgap (mm)
3901090254 Rev. 005
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
Page 7 of 9
Datasheet Jun/04
MLX90254
Differential Dynamic Hall Effect Sensor
11.
Package Information
5.33 5.43 5.08 5.24 J 1.22 1.32 3.76 3.86
VA Package Dimensions
VA Hall Plate / Chip Location
2.250 +/-0
0.387
4.50 4.10 45 o X 1mm 5o 5o (2x)
A B C
Hall Plates size: 0.20 x 0.20
0.289
2.95+/-0.15
3. 46 3 .79 3 .63
254BB ZZZZZ
VA
(2x)
0.387 0.289 D
3. 30
Marked Surface All Dimensions in millimeters
F G H
1.0 MAX B 0.22 REF 0.66 0.61 0.29 0.24 45 o A 1.20 1.10 E
0.94+/- 0.15
1
2
3
4
C
Notes: 1. Pinout:
10.0 11.0
D
E
0.31 0.18 0.60 0.40 0.35 0.25 0.15 0.0 45 o
F 0.45 0.35 G
H
J
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. (c) 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:
Phone: +32 13 67 04 95 E-mail: sales_europe@melexis.com
All other locations:
Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com
ISO/TS16949 and ISO14001 Certified
3901090254 Rev. 005
Page 9 of 9
Datasheet Jun/04

▲Up To Search▲

Price & Availability of MLX90254

	To Download MLX90254 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .