The AH1891 is a miniature micropower Omnipolar Hall effect switch IC with dual outputs specifically designed for portable and battery powered equipment such as cellular phones and portable PCs. To support battery powered equipment the AH1891 has been optimized to operate over the supply range of 1.8V to 3.3V and uses a sleep function to give an average supply current of only 7µA. To minimize PCB space the AH1891 is packaged in the small CSP package (0.8mmx0.8mm) and the design integrates the external pull up resistors to simplify the applications circuit. The outputs of the AH1891 are switched with either a North or South pole of sufficient strength. When the magnetic flux density (B) is larger than operate point (Bop), Output 1 will pull low and Output 2 will be inverted (high). The output states are held until B is lower than release point (Brp). The AH1891 is available in U-WLB0808-4 package.