AH1891-CA4-7 Diodes Incorporated

PART OBSOLETE - USE AH1898 / AH1892 AH1891 MINIATURE MICROPOWER OMNIPOLAR HALL EFFECT SWITCH Description Pin Assignments The AH1891 is a minature micropower Omnipolar Hall effect switch IC with dual outputs, specifically designed for portable and battery (Top View) (Bottom View) powered equipment such as cellular phones and portable PCs. To A1 A2 support battery powered equipment the AH1891 is 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 7A. To minimize A2 A1 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. B2 B1 The outputs of the AH1891 are switched with either a North or South B1 B2 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. Applications Features Omnipolar (North or South) operation Cellular Phones Low Supply Voltage of 1.8V to 3.3V Portable PCs and PDAs Micropower Operation Digital Cameras Dual Outputs for Design Flexibility Portable and Battery Powered Applications Internal Pull Up and Pull Down Capability Chopper stabilized design for: - Superior temperature stability - Superior temperature stability - Superior temperature stability Good RF Noise Immunity -40C to 85C Operating Temperature ESD 4KV in Human Body Mode Miniature CSP package 0.8mm x 0.8mm Typical Application Circuit Output 1 Vdd AH1891 Output 2 GND 1 of 7 AH1891 May 2016 Diodes Incorporated www.diodes.com Document number: DS35207 Rev. 2 - 4 NEW PRODUCT OBSOLETE PART DISCONTINUED Offset Offset Cancelling Cancelling AH1891 Pin Descriptions Pin Pin Name Description A1 Out 1 Output Pin ( active low ) A2 Out 2 Output Pin (active high) B1 GND Ground B2 Vdd Power Supply Voltage Functional Block Diagram Vdd Power switch Hall Plate Latch Amp Out1 Output GND Controller Vdd Hall Plate Amp Latch Out2 GND Absolute Maximum Ratings (T = 25C) A Symbol Parameter Values Unit Vdd Supply voltage 5 V B Magnetic flux density Unlimited T Operating Temperature Range -40 to +85 C A Ts Storage Temperature Range -65 to +150 C P Package Power Dissipation 166 mW D T Maximum Junction Temperature 150 C J Recommended Operating Conditions (T = 25C) A Symbol Parameter Conditions Rating Unit Vdd Supply Voltage Operating 1.8 to 3.3 V 2 of 7 AH1891 May 2016 Diodes Incorporated www.diodes.com Document number: DS35207 Rev. 2 - 4 NEW PRODUCT OBSOLETE PART DISCONTINUED