AH1802_10

AH1802 MICROPOWER, ULTRA-SENSITIVE OMNIPOLAR HALL-EFFECT SENSOR SWITCH Description The AH1802 is a ultra-sensitivity, micropower Omnipolar Hall Effect switch IC designed for portable and battery powered equipment such as cellular phones, PDA’s and portable PC’s. Based on two sensitive Hall Effect plates and a chopper stabilized architecture the AH1802 provides a reliable solution over the whole operating range. To support portable and battery powered equipment the design has been optimized to operate over the supply range of 2.5V to 5.5V and consumes only 24uW with a supply of 3V. The single open drain output can switched on with either a north or south pole of sufficient strength. When the magnetic flux density (B) is larger than operate point (Bop) the output is switched on (pulled low). The output is turned off when B becomes lower than the release point (Brp). The output will remain off when there is no magnetic field. Pin Assignments (Top View) 2. Output GND 3. 1. Vdd SC59 (Top View) 6. NC 5. GND 4. NC 1. Vdd 2. NC 3. Output DFN2020-6 (Top View) 3. GND (Top View) 3. GND 1. Vdd 3. Output DFN2020-3 1. Vdd 2. Output DFN2015H4-3 Features • • • • • • Omni-polar (north or south pole) operation High sensitivity Single open drain output Micropower operation 2.5V to 5.5V operating range Chopper stabilized design provides • Superior temperature stability • Minimal switch point drift • Enhanced immunity to stress Good RF noise immunity -40°C to 85°C operating temperature ESD＞5kV for DFN2020-6, DFN2020-3 and DFN2015H4-3 ESD＞6kV for SC59 • • Low profile SC59, DFN2020-6, DFN2020-3 and DFN2015H4-3 packages “Green” Molding Compound (Note 1) Applications • • • • Cover switch in clam-shell or slide type cellular phones Display switch for portable PCs On/Off switch for PDAs and digital cameras Contact-less switch in consumer products • • • Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. AH1802 Document number: 31170 Rev. 8 - 2 1 of 11 www.diodes.com December 2010 © Diodes Incorporated AH1802 MICROPOWER, ULTRA-SENSITIVE OMNIPOLAR HALL-EFFECT SENSOR SWITCH Typical Application Circuit 2.5~5.5V RL C AH1802 GND Output Pin Descriptions Pin Name Vdd GND Output NC Notes: P/I/O P/I P/I O Description Power Supply Input Ground Output Pin No connection (Note 2) 2. NC is “No Connection”- recommendation is to connect the NC pin to ground externally. Functional Block Diagram 1 Power switch Offset Cancelling Hall Plate Vdd Output Amp Latch 3 Logical GND 2 Offset Cancelling Hall Plate Amp Latch AH1802 Document number: 31170 Rev. 8 - 2 2 of 11 www.diodes.com December 2010 © Diodes Incorporated AH1802 MICROPOWER, ULTRA-SENSITIVE OMNIPOLAR HALL-EFFECT SENSOR SWITCH Absolute Maximum Ratings (TA = 25°C) Symbol Vdd B Ts PD TJ Characteristics Supply Voltage Magnetic Flux Density Storage Temperature Range Package Power Dissipation Maximum Junction Temperature Values 7 Unlimited -65 to +150 230 150 Unit V °C mW °C Recommended Operating Conditions (TA = 25°C) Symbol Vdd TA Parameter Supply Voltage Operating Temperature Range Conditions Operating Operating Rating 2.5 to 5.5 -40 to +85 Unit V °C Electrical Characteristics (TA = 25°C, Vdd = 3V; unless otherwise specified) Symbol Vout Ioff Idd(en) Characteristic Output On Voltage Output Leakage Current Conditions Iout=1mA Vout=5.5V, B < Brp Chip enable, TA= 25°C, Vdd = 3V Chip enable, TA= -40~85°C, Vdd = 2.5~5.5V Chip disable, TA= 25°C, Vdd = 3V Chip disable, TA= -40~85°C, Vdd = 2.5~5.5V Average supply current , TA= 25°C, Vdd = 3V Average supply current , TA= -40~85°C, Vdd = 2.5~5.5V For design information only (Note 3) (Note 3) Min Typ. 0.1