AH1903 HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH Description Pin Assignments The AH1903 is a high sensitivity micropower Omnipolar or Unipolar selectable Hall effect switch IC with internal pull up and pull down capability. Designed for battery powered consumer equipment such as cellular phones and portable PCs to office equipment, home appliances and industrial applications, the average supply current is only 4.3A at 1.8V. To support portable equipment the AH1903 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1903 is available in a small low profile X1-DFN1216-4 package. The user can change the Hall switch function between Unipolar and Applications Omnipolar operation via the Select (SEL) pin. If the SEL pin is open Open and Close Detect for flip/slide Cellular Phones circuit or pulled high the AH1903 operates in Unipolar switch mode Smart Cover or Dock Detect for Cellular Phones and Tablet PCs detecting magnetic field direction with a South pole to the part mark Cover or Display Switch in Portable PCs (eg Ultrabook) side of the package. If the SEL pin is pulled low the AH1903 functions Digital Still, Video Cameras and Handheld Gaming Consoles as a Omnipolar switch detecting either a North or South pole. The Door, Lids and Tray Position Switches output is activated with a pole of sufficient magnetic field strength. Level, Proximity and Position Switches When the magnetic flux density (B) perpendicular to the package is Contact-Less Switches in Home Appliances and Industrial larger than operate point (Bop), the output will be turned on (pulled Applications low) and held until B is lower than release point (Brp). Features Unipolar or Omnipolar Operation Operation can be changed by a logic source or fixed via Typical Application Circuit PCB design with no additional components Supply Voltage of 1.6V to 3.6V High Sensitivity Micropower Operation Chopper Stabilized Design Provides Superior Temperature Stability Minimal Switch Point Drift Enhanced Immunity to Physical Stress No External Pull-up Resistors Required Good RF Noise Immunity -40C to +85C Operating Temperature High ESD capability of 8kV (Human Body Model) on V , GND DD and OUTPUT Pins Small Low Profile X1-DFN1216-4 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AH1903 Pin Descriptions Package: X1-DFN1216-4 Pin Number Pin Name Function 1 OUTPUT Output Pin 2 GND Ground Pin Unipolar or Omnipolar Operation Select Pin For Unipolar operation, pull-up the SEL pin to V or leave it unconnected. DD 3 SEL The SEL pin is internally pulled high. For Omnipolar operation, connect the SEL pin to GND. 4 V Power Supply Input DD The center exposed pad - It is internally connected to V pin and should DD Pad Pad not be connected to GND or any other signal on the PCB. The exposed pad should be left open (unconnected) on the PCB layout. Functional Block Diagram Absolute Maximum Ratings (Note 5) ( T = +25C, unless otherwise specified.) A Symbol Parameter Rating Unit V Supply Voltage (Note 6) 6 V DD V Reverse Supply Voltage -0.3 V DD REV I Output current (source and sink) 3 mA OUTPUT B Magnetic Flux Density Unlimited P Package Power Dissipation X1-DFN1216-4 230 mW D Ts Storage Temperature Range -65 to +150 C T Maximum Junction Temperature 150 C J V , GND and OUTPUT pins 8 kV DD ESD HBM Human Body Model (HMB) ESD capability Logic SEL pin 6 kV Notes: 5. Stresses greater than the Absolute Maximum Ratings specified above may cause permanent damage to the device. These are stress ratings only functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. 6. The absolute maximum V of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to DD operate the device at the absolute maximum rated conditions for any period of time. 2 of 11 June 2014 AH1903 Diodes Incorporated www.diodes.com Document number: DS36568 Rev. 3 - 2 NEW PRODUCT