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AH1902
Document number: DS36533 Rev. 4 - 2
1 of 11
www.diodes.com
April 2016
© Diodes Incorporated
NEW PROD UCT
AH1902
HIGH SENSITIVITY MICROPOWER
OMNIPLOAR HALL-EFFECT SWITCH
Description
The AH1902 is a high-sensitivity micropower Omnipolar Hall effect
switch IC with internal pull up and pull down capability. Designed for
portable and 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 potable equipment the AH1902 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
AH1902 is available in small low profile X1-DFN1216-4,
X2-DFN2015-6 and SOT553 packages.
The 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) and held until B is lower than
release point (Brp).
Features
Omnipolar Operation (North or South Pole)
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
-40°C to +85°C Operating Temperature
High ESD capability of 8kV (Human Body Model)
Small Low Profile X1-DFN1216-4, X2-DFN2015-6 and SOT553
Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Pin Assignments
V
DD
NC
OUTPUT
GND
( Top View )
X1-DFN1216-4
2
1
3
4
X2-DFN2015-6
( Top View )
1
3
2
6
4
5
V
DD
GND
NC
NC
OUTPUT
NC
5
43
2
1
GND
OUTPUT
NC
NC
V
DD
( Top View )
SOT553
Applications
Open and Close Detect for Flip/Slide Cellular Phones
Smart Cover or Dock Detect for Cellular Phones and Tablet PCs
Cover or Display Switch in Portable PCs (eg: Ultrabook)
Digital Still, Video Cameras and Handheld Gaming Consoles
Door, Lids and Tray Position Switches
Level, Proximity and Position Switches
Contact-Less Switches in Home Appliances and Industrial
Applications
Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html ogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-h contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
AH1902
1.6V to 3.6V
OUTPUT
GND
C
IN
V
DD
Note: 4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to
the supply pin as possible.
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