AH1891

AH1891 MINIATURE MICROPOWER OMNIPOLAR HALL EFFECT SWITCH Description 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 7uA. 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. Pin Assignments (Top View) A1 A2 A2 A1 (Bottom View) N EW PRODUCT B2 B1 B1 B2 Features • • • • • • 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: o Superior temperature stability o Superior temperature stability o 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 Applications • • • • Cellular phones Portable PCs and PDAs Digital cameras Portable and battery powered applications • • • • Typical Application Circuit Vdd Output 1 AH1891 Output 2 GND AH1891 Document number: DS35207 Rev. 1 - 2 1 of 7 www.diodes.com April 2011 © Diodes Incorporated AH1891 MINIATURE MICROPOWER OMNIPOLAR HALL EFFECT SWITCH Pin Descriptions Pin # A1 A2 B1 B2 Pin Name Out 1 Out 2 GND Vdd Description Output Pin (active low) Output Pin (active high) Ground Power Supply Voltage N EW PRODUCT Functional Block Diagram Vdd Hall Plate Power switch Offset Cancelling Amp Latch Out1 Output Controller GND Vdd Hall Plate Absolute Maximum Ratings (TA = 25°C) Symbol Vdd B TA Ts PD TJ Parameter Supply voltage Magnetic flux density Operating Temperature Range Storage Temperature Range Package Power Dissipation Maximum Junction Temperature Values 5 Unlimited -40 to +85 -65 to +150 166 150 Unit V °C °C mW °C Recommended Operating Conditions (TA = 25°C) Symbol Vdd Parameter Supply Voltage Conditions Operating Rating 1.8 to 3.3 Unit V Offset Cancelling Amp Latch Out2 GND AH1891 Document number: DS35207 Rev. 1 - 2 2 of 7 www.diodes.com April 2011 © Diodes Incorporated AH1891 MINIATURE MICROPOWER OMNIPOLAR HALL EFFECT SWITCH Electrical Characteristics (TA = 25°C, Vdd = 1.8V, unless otherwise specified) Symbol VOH VOL Ioff Idd(en) Parameter Output On Voltage (High side) Output On Voltage (Low side) Output Leakage Current Supply Current Awake Time Period Duty Cycle Conditions IO= -0.5mA IO= 0.5mA Output off Chip enable Chip disable Average supply current Min Vdd-0.2 Typ.