AH1891-CA4-7

PART OBSOLETE - USE AH1898 / AH1892 AH1891 MINIATURE MICROPOWER OMNIPOLAR HALL EFFECT SWITCH Description Pin Assignments PRODUCT DISCONTINUED OBSOLETE –NEW PART The AH1891 is a minature 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 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 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. (Top View) A1 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). B1 (Bottom View) A2 A2 A1 B2 B1 B2 The AH1891 is available in U-WLB0808-4 package. Features Applications        Cellular Phones    Portable PCs and PDAs Digital Cameras Portable and Battery Powered Applications    Omnipolar (North or South) operation Low Supply Voltage of 1.8V to 3.3V Micropower Operation Dual Outputs for Design Flexibility Internal Pull Up and Pull Down Capability Chopper stabilized design for: Superior temperature stability Superior temperature stability Superior temperature stability Good RF Noise Immunity -40°C to 85°C 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 AH1891 Document number: DS35207 Rev. 2 - 4 1 of 7 www.diodes.com May 2016 © Diodes Incorporated AH1891 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 Hall Plate Power switch Offset Cancelling Latch Amp Out1 Output Controller Hall Plate Offset Cancelling PRODUCT DISCONTINUED OBSOLETE –NEW PART Pin Descriptions Amp GND Vdd Latch Out2 GND Absolute Maximum Ratings (TA = 25C) Symbol Vdd B Parameter Supply voltage Magnetic flux density TA Ts Operating Temperature Range Storage Temperature Range PD TJ Package Power Dissipation Maximum Junction Temperature Values Unit 5 V Unlimited -40 to +85 -65 to +150 C C 166 150 mW C Recommended Operating Conditions (TA = 25C) Symbol Parameter Conditions Rating Unit Vdd Supply Voltage Operating 1.8 to 3.3 V AH1891 Document number: DS35207 Rev. 2 - 4 2 of 7 www.diodes.com May 2016 © Diodes Incorporated AH1891 Electrical Characteristics (TA = +25°C, Vdd = 1.8V, unless otherwise specified) PRODUCT DISCONTINUED OBSOLETE –NEW PART Symbol Parameter Conditions Min Typ. Max Unit V VOH Output On Voltage (High side) IO= -0.5mA Vdd-0.2 - - VOL Output On Voltage (Low side) IO= 0.5mA - 0.2 V Ioff Output Leakage Current Output off -