EC2648

w w m EC2648 o c . CMOS Omnipolar High Sensitivity Micropower Hall Switch U 4 t e Features and e Benefits h Chopper S stabilized amplifier stage a consumption for battery-powered application t aMicropower output switches with absolute value of North or South pole from magnet .D Omnipolar, w High Sensitivity for direct reed switch replacement applications TM 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 application Description The EC2648 Omnipolar TM 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 powe...