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Magnetic Switch

《IST8508 3D Omni-polar Magnetic Switch》
The iST8508 is a 3D omni-polar magnetic switch featuring low hysteresis, low power consumption, and adjustable magnetic operating points that can be as low as 15G. The iST8508 Hall effect sensor IC is fabricated with mixed signal CMOS technology. It comprises one AMR sensor, one Hall plate, and a CMOS output driver, mainly designed for battery-operation, hand-held equipment (such as Cellular and Cordless Phone, PAD). The total power consumption in normal operation is typically 18.81μW with a 3.3V power source.
A magnetic field of sufficient strength will turn the output on (low voltage). The output will be turned off (high voltage) when the magnetic field ceases to exist. More precisely, when the absolute value of the applied magnetic flux density (B) is larger than the absolute value of the operating point (BOP), the output will be turned low and kept low until the absolute value of B becomes lower than the absolute value of the release point (BRP), below which point the output returns to high voltage.
The iST8508 is available in SOT23-3L package. Operating temperature range of the iST8508 is from -40°C to 85°C.
To minimize the BOM cost, capacitors of the MLCC type are supported, and only one external component is needed to complete the application circuit.

Features
•Micro power consumption ideal for battery-powered applications
•Omni-polar (operation with magnetic field of either north or south pole), easy to use as output
•Input Voltage Range: 2.5V to 5.5V
•Very high sensitivity hall sensor
•Chopper stabilized amplifier stage
•Good RF noise immunity
•SOT23-3L package
•No need of a pull-high resistor

Applications
•Cover switch in clam-shell cellular phones
•Cover switch in Notebook PC/PAD
•Contact-less switch in consumer products
•Solid State Switch
•Handheld Wireless Handset Awake Switch
•Lid close sensor for battery-powered devise
•Magnet proximity sensor for reed switch replacement

 

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