描述 Description

The AH1899B is a high-sensitivity micropower, Omnipolar Hall-effect switch IC with internal pullup and pulldown capability. Designed for portable and battery-powered equipment, such as cellular phones and portable PCs, the average supply current is only 0.95μA at 1.2V and 1.1μA at 1.8V. To support portable equipment, the AH1899B can operate over the supply range of 1.1V to 2.0V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space, the AH1899B is available in a small low-profile X2-DFN1010-4 (Type B) package.


The output is activated with either a north or south pole of sufficient magnetic field strength. When the magnetic flux density (B) perpendicular to the package is larger than the operate point (BOP), the output is turned on (pulled low). The output is turned off when B becomes lower than the release point (BRP). The output will remain off when there is no magnetic field.