SS248

SS248 CMOS Omnipolar High Sensitivity Micropower Hall Switch Features     Micropower consumption for battery powered 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 3 pin SOT23 (suffix SO) 3 pin SIP (suffix UA) Chopper stabilized amplifier stage2．Description The S248 Omnipolar 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 S248 will be latched on (Bop) in the presence of a sufficiently strong South or North magnetic field facing the marked side of the package. ...