HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
The AH1812 is a high sensitivity micropower Omnipolar Hall effect
switch IC with an open drain output. Designed for portable and battery
powered equipment such as cellular phones and portable PCs, the
average supply current is only 4.3µA at 1.85V. To support potable
equipment the AH1812 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 AH1812 is available in
small low profile X1-DFN1216-4 package
The open drain output is activated with either a North or South pole of
sufficient magnetic field strength. When the magnetic flux density (B)
perpendicular to the package is larger than operate point (Bop), the
output will be turned 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.
Omnipolar Operation (North or South Pole)
Supply Voltage of 1.6V to 3.6V
Chopper Stabilized Design Provides:
Superior Temperature Stability
Extremely Low Switch-Point Drift
Enhanced Immunity to Stress
Open Drain Output for System Flexibility
Good RF Noise Immunity
-40°C to +85°C Operating Temperature
Small and Low Profile X1-DFN1216-4 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Cover or Display Switch in Portable PCs
Open and Close Detect for Cellular Phones
Holster Detect for Cellular Phones and Tablet PCs
Digital Still and Video Cameras
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit (Note 4)
1.6V to 3.6V
4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF to 100nF.
RL is the pull-up resistor, the recommended resistance is 10kΩ to 100kΩ.
Document number: DS36171 Rev. 2 - 2
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