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Features and Benefits
* * * * * Chopper stabilized amplifier stage Micropower consumption for batterypowered applications Omnipolar, output switches with absolute value of North or South pole from magnet Operation down to 2.5V High Sensitivity for direct reed switch replacement applications
* * * *
Applications
Solid state switch Handheld Wireless Handset Awake Switch Lid close sensor for battery powered devices Magnet proximity sensor for reed switch replacement in low duty cycle applications
Ordering Information
Part No. MLX90248 MLX90248 Temperature Suffix E (-40C to 85C) E (-40C to 85C) Package UA (TO-92 flat) SO (SOT-23)
Functional Diagram
Description
The MLX90248 OmnipolarTM Hall effect sensor IC is fabricated from mixed signal CMOS technology. It incorporates advanced chopper-stabilization techniques to provide accurate and stable magnetic switch points.
Output
VDD
Sleep/ Awake Logic
Chopper
GND UA Package Pin 1 - VDD Pin 2 - GND Pin 3 - Output SO Package Pin 1 - VDD Pin 2 - Output Pin 3 - GND
The circuit design provides an internally controlled clocking mechanism to cycle power to the Hall element and analog signal processing circuits. This serves to place the high current-consuming portions of the circuit into a "Sleep" mode. Periodically the device is "Awakened" by this internal logic and the magnetic flux from the Hall element is evaluated against the predefined thresholds. If the flux density is above or below the Bop/Brp thresholds then the output transistor is driven to change states accordingly. While in the "Sleep" cycle the output transistor is latched in its previous state. The design has been optimized for service in applications requiring extended operating lifetime in battery powered systems. The output transistor of the 90248 will be latched on (BOP) in the presence of a sufficiently strong South or North magnetic field facing the marked side of the package. The output will be latched off (BRP) in the absence of a magnetic field. The SOT-23 device is magnetically inverted from the UA SIP device
Note: Static sensitive device; please observe ESD precautions. Reverse VDD protection is not included. For reverse voltage protection, a 100W resistor in series with VDD is recommended.
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MLX90248 Electrical Specifications
DC operating parameters: TA = 25oC, VDD = 3VDC (unless otherwise specified). Parameter Supply Voltage Supply Current Output Current Saturation Voltage Awake mode time Sleep mode time Symbol Test Conditions VDD IDD Iout VSAT Taw Tsl Operating Average IOUT=1mA Operating Operating Min 2.5 Typ 2.75 10 Max 3.5 1 0.4 150 50 70 Units V uA mA V uS mS
Magnetic Specifications
DC operating parameters: TA = 25oC, VDD =3 VDC (unless otherwise specified).
90248
Parameter Operating Point Release Point Hysteresis Note: 1 mT = 10 Gauss. Symbol Test Conditions BOP BRP Bhys +/-0.5 Min Typ +/-3.8 +/-2.1 1.7 Max +/-6.0 Units mT mT mT
Absolute Maximum Ratings
Supply Voltage (Operating), VDD Supply Current (Fault), IDD Output Voltage, VOUT Output Current (Fault), IOUT Operating Temperature Range, TA Storage Temperature Range, TS 5V 5mA 5V 5mA -40 to 85C -55 to 150C
Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. Melexis does not assume any liability arising from the use of any product or application of any product or circuit described herein.
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Performance Graphs
5 4 Bop+ 3 2
Typical Magnetic Switchpoints versus Vdd
Typical Magnetic Switchpoints versus Temperature
4 Bop+ 3
Field Strength (mT)
Flux Density (mT)
2 Brp+ 1 0 -1 Brp-
Brp+ 1
0 -1 Brp-2
-2 -3 -4 2,2 2,4 2,6 2,8 3 3,2 -3 Bop-4 -40 Bop-
-20
0
20
40
60
80
Vdd (V)
Temperature (C)
Typical Current Consumption versus Temperature, Vdd=3V
14
3
Output Switching Characteristics
12
Average Current (uA)
2,5
Current Consumption
10
2
8
6 Sleep Current (uA) 4
Awake Current (mA)
Output Voltage
1,5
1
2
0,5
0 -40
-20
0
20
40
60
80
0 -80
-60
-40
-20
0
20
40
60
80
Temperature (C)
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Magnetic Field (Gauss)
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Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched capacitor techniques to eliminate the amplifier offset voltage, which, in bipolar devices, is a major source of temperature sensitive drift. CMOS makes this advanced technique possible. The CMOS chip is also much smaller than a bipolar chip, allowing very sophisticated circuitry to be placed in less space. The small chip size also contributes to lower physical stress and less power consumption.
Installation Comments
Consider temperature coefficients of Hall IC and magnetics, as well as air gap and life time variations. Observe temperature limits during wave soldering.
Typical Application
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TO-92 (UA) Package Physical Characteristics
TO-92 (UA) Package Hall Location
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SOT-23 (SO) Package Physical Characteristics
SOT-23 (SO) Package Hall Location
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Reliability information
Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave soldering with usual (63/37 SnPb-) solder (melting point at 183degC). The following test methods are applied:
* * *
IPC/JEDEC J-STD-020A (issue April 1999) Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices CECC00802 (issue 1994) Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality MIL 883 Method 2003 / JEDEC-STD-22 Test Method 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. For more information http://www.melexis.com/ on manufacturability/solderability see quality page at our website:
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
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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
QS9000, VDA6.1 and ISO14001 Certified
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