AH1903

NEW PRODUCT AH1903 HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH Description The AH1903 is a high sensitivity micropower Omnipolar or Unipolar selectable Hall effect switch IC with internal pull up and pull down capability. Designed for battery powered consumer equipment such as cellular phones and portable PCs to office equipment, home appliances and industrial applications, the average supply current is only 4.3µA at 1.8V. To support portable equipment the AH1903 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1903 is available in a small low profile X1-DFN1216-4 package. The user can change the Hall switch function between Unipolar and Omnipolar operation via the Select (SEL) pin. If the SEL pin is open circuit or pulled high the AH1903 operates in Unipolar switch mode detecting magnetic field direction with a South pole to the part mark side of the package. If the SEL pin is pulled low the AH1903 functions as a Omnipolar switch detecting either a North or South pole. The output is activated with a pole of sufficient magnetic field strength. When the magnetic flux density (B) perpendicular to the package is larger than operate point (Bop), the output will be turned on (pulled low) and held until B is lower than release point (Brp). Pin Assignments Applications Open and Close Detect for flip/slide Cellular Phones Smart Cover or Dock D...