AH1902
HIGH SENSITIVITY MICROPOWER
OMNIPLOAR HALL-EFFECT SWITCH
Description
Pin Assignments
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 4.3μA 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.
( Top View )
( Top View )
VDD
NC
1
2
3
6
5
4
OUTPUT
NC
1
2
4
3
VDD
NC
OUTPUT
GND
GND
NC
X2-DFN2015-6
X1-DFN1216-4
( Top View )
1
5
4
NC
GND
NC
OUTPUT
2
3
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).
VDD
SOT553
Applications
Features
Open and Close Detect for Flip/Slide Cellular Phones
Omnipolar Operation (North or South Pole)
Supply Voltage of 1.6V to 3.6V
High Sensitivity
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
Micropower Operation
Chopper Stabilized Design Provides:
Level, Proximity and Position Switches
-
-
-
Superior Temperature Stability
Minimal Switch Point Drift
Contact-Less Switches in Home Appliances and Industrial
Applications
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)
Halogen and Antimony Free. “Green” Device (Note 3)
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 for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
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
1.6V to 3.6V
VDD
OUTPUT
AH1902
CIN
GND
Note:
4. CIN 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.
1 of 11
www.diodes.com
April 2016
© Diodes Incorporated
AH1902
Document number: DS36533 Rev. 4 - 2
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