全极霍尔开关DH481.pdfVIP

深圳凯祥科技有限公司 DH481 CMOS Omnipolar High Sensitivity Micropower Hall Switch 1 ．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 Chopper stabilized amplifier stage2 ．Description The 248 Omnipolar Hall effect sensor IC is fabricated from mixed signal The DH481 Omnipolar Hall effect sensor 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 The output transistor of the 248 w ill be latched on (Bop) in the presence The output transistor of the DH481 w 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 fi