AH1804-FA-7 Diodes Incorporated

AH1804 MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH Description Pin Assignments ( Top View ) The AH1804 is a micropower Omnipolar Hall effect switch IC GND NC with a single output driver with internal pull up and pull down 4 3 capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs the average supply current is only 12A at 3.3V. To support battery powered equipment the AH1804 can operate over the 1 2 supply range of 2.5V to 3.6V and uses a hibernating clocking V Output DD system to minimize the power consumption. DFN1216-4 The output is activated with either a north or south pole of (Top View) sufficient strength. When the magnetic flux density (B) is larger than operate point (Bop), the output will be turned on 3. Output (pulled low) and held until B is lower than release point (Brp). GND 2. 1. V DD The AH1804 is available in SC59 and small low profile DFN1216-4 packages. SC59 Features Applications Omnipolar operation (North or South pole) Low supply voltage 2.5V to 3.6V Cover switch in clam-shell and slide cellular phones Micropower operation Cover switch in portable PCs, Tablets and PDA No external pull up resistors required Display screen open/close detect in Digital Chopper stabilized design camcorders o Superior temperature stability Contact-less switch in portable battery powered o Extremely Low Switch-Point Drift consumer and industrial products o Insensitive to Physical Stress Good RF noise immunity -40C to 85C operating temperature Small low profile DFN1216-4 and SC59 packages ESD (HBM) 5KV Green Molding Compound Typical Application Circuit V DD 2.5V to 3.6V Cin Output AH1804 GND Note: Cin is for power stabilization and to strengthen the noise immunity, C = 100nF or higher must be used. 1 of 9 September 2011 AH1804 Diodes Incorporated www.diodes.com Document number: DS35314 Rev. 2 - 2 NEW PRODUCT Offset Offset Cancellation Cancellation AH1804 MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH Pin Descriptions Pin Name P/I/O Description V P/I Power Supply Input DD GND P/I Ground Output O Output Pin NC NC No Connection (Note 1) Notes: 1. NC is No Connection which is not connected internally. This pin can be left open or tied to ground. Functional Block Diagram V DD Sleep/Awake Logic and Power Switch Hall Plate Amp Latch Output Driver Output Controller Hall Plate GND Amp Latch 2 of 9 September 2011 AH1804 Diodes Incorporated www.diodes.com Document number: DS35314 Rev. 2 - 2 NEW PRODUCT