AH1894-FA-7 Diodes Incorporated

AH1894 PROGRAMMABLE HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH Description Pin Assignments The AH1894 is a high sensitivity micropower magnetic range selectable Omnipolar Hall effect switch IC with internal pull up and (Top View) pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs to home appliances and industrial applications, the average power consumption is only 8uW at 1.85V. To support portable equipment the AH1894 can operate over the supply range of 1.6V to 3.6V and uses X1-DFN1216-4 a hibernating clocking system to minimize the power consumption. To minimize PCB space the AH1894 is available in small low profile X1-DFN1216-4 and SOT553 packages. (Top View) The output is activated with either a north or south pole of sufficient magnetic field strength. The user can select one of two magnetic sensitivity bands via the BSEL pin without the addition of any external components allowing a flexible but small solution. The band select can be hardwired or be changed on the fly via a logic source such as a micro-controller. When the magnetic flux density (B) is larger than operate point (Bop), the output will be turned on (pulled low) and held SOT553 until B is lower than release point (Brp). Features Applications Omnipolar Operation (North or South pole) Open and Close Detect for Cellular Phones Programmable Operate and Release Points Holster or cover detect for cellular phones and Tablet PCs Supply Voltage of 1.6V to 3.6V Cover or Display Switches in Portable PCs Micropower Operation Digital Still, Video Cameras and Handheld Gaming Consoles Chopper Stabilized Design Provides: Door, Lids and Tray Position Switches Superior Temperature Stability Level, Proximity and Position Switches Minimal Switch Point Drift Contact-Less Switches in Home Appliances and Industrial Enhanced Immunity to Physical Stress Applications 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 and SOT553 Packages 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 AH1894 Pin Descriptions Package: X1-DFN1216-4 Pin Number Pin Name Function 1 OUTPUT Output Pin 2 V Power Supply Input DD 3 BSEL Band Select 4 GND Ground Pin Package: SOT553 Pin Number Pin Name Function 1 Power Supply Input V DD 2 NC No Connection (Note 5) 3 BSEL Band Select 4 GND Ground 5 OUTPUT Output Note: 5. NC is No Connection pin and is not connected internally. This pin can be left open or tied to ground. Functional Block Diagram 2 of 13 July 2013 AH1894 Diodes Incorporated www.diodes.com Document number: DS35741 Rev. 1 - 2 NEW PRODUCT