MLX90248 技术资料及报价现货（含PDF）

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MLX90248 技术资料及报价现货（含PDF）

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90248.pdf
　　Features and Benefits
　　Micropower consumption ideal for battery-
　　powered applications
　　Omnipolar， easy to use as output switches
　　with both North and South pole
　　Ultra-Thin QFN package （0。43mm max） &
　　Thin SOT23 3L （both RoHS Compliant）
　　Very High Sensitivity Hall Sensor
　　Chopper stabilized amplifier stage
　　Operation down to 2。5V
　　Application Examples
　　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
　　2 General 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。
　　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。
　　9 Detailed General Description
　　MLX90248
　　Micropower & Omnipolar？ Hall Switch
　　The MLX90248 is originally used in mobile phone applications for open/close lid detection （slide and jack-
　　knife phone type）。 The goal of this detection is to switch on or off the application if the lid is opened or closed，
　　in order to save battery power。
　　The same operation principle can be simply applied to any other battery-powered device with a lid/cover like
　　laptop， digital cameras and camcorders。
　　By the use of a very high sensitivity Hall sensor， a very small and cheap magnet is enough to trigger the
　　MLX90248， hence it can easily replace reed switch。
　　The major benefit of using a Hall sensor is to provide “electronic” commutation， which is bounce-free， more
　　reliable and with increased lifetime compared to usual mechanical contacts。
　　10 Unique Features
　　The MLX90248 exhibits “Omnipolar” magnetic characteristics。 It means the device reacts to both North and
　　South magnetic pole。 The purpose is to detect the presence of any magnetic field applied on the device。
　　This mode of operation simplifies customer production processes by avoiding the need to detect the Hall
　　sensor pole active on the magnet used in the application。
　　Taking the example of a generic Hall sensor “south pole active”， during its production， the customer must
　　detect the south pole of the application magnet and face it to the device to enable the output to be turned on
　　and off。 Without any magnet pole detection system， the incorrect magnetic pole （north in this example） could
　　be faced to the device which would fail the application。
　　Therefore， the “Omnipolar” magnetic behaviour helps customers by removing the need of magnet pole
　　detection system during production phase。
　　The “Micropower” feature makes the MLX90248 especially suitable for battery-powered device as it combines
　　low voltage operation and low current consumption。 By using a sleep/awake strategy managed internally， the
　　power consumption is drastically reduced。 To make a comparison， the MLX90248 consumes 100 times less
　　power than the generic low voltage Melexis Hall sensor US3881。
　　As well as Thin SOT package， the MLX90248 is now delivered in an ultra thin UTQFN package。 This new
　　leadless package only requires 3mm2 PCB surface and is 0。43mm maximum thick， which is particularly
　　important in design where space-saving and miniaturisation are the critical factors。
　　13 Standard information regarding manufacturability of Melexis
　　products with different soldering processes
　　Our products are classified and qualified regarding soldering technology， solderability and moisture sensitivity
　　level according to following test methods：
　　Reflow Soldering SMD’s （Surface Mount Devices）
　　？ 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）
　　Wave Soldering SMD’s （Surface Mount Devices） and THD’s （Through Hole Devices）
　　？ EN60749-20
　　Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat
　　？ EIA/JEDEC JESD22-B106 and EN60749-15
　　Resistance to soldering temperature for through-hole mounted devices
　　Iron Soldering THD’s （Through Hole Devices）
　　？ EN60749-15
　　Resistance to soldering temperature for through-hole mounted devices
　　Solderability SMD’s （Surface Mount Devices） and THD’s （Through Hole Devices）
　　？ EIA/JEDEC JESD22-B102 and EN60749-21
　　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。
　　Melexis is contributing to global environmental conservation by promoting lead free solutions。 For more
　　information on qualifications of RoHS compliant products （RoHS = European directive on the Restriction Of
　　the use of certain Hazardous Substances） please visit the quality page on our website：
　　http：//www。melexis。com/quality。aspx
　　14 ESD Precautions
　　Electronic semiconductor products are sensitive to Electro Static Discharge （ESD）。
　　Always observe Electro Static Discharge control procedures whenever handling semiconductor products