Diodes AH1897 - Manual

AH1897
Document number: DS36470 Rev. 1 - 2
1 of 8
www.diodes.com
August 2013
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AH1897
HIGH SENSITIVITY MICROPOWER
OMNIPLOAR HALL-EFFECT SWITCH
Description
The AH1897 is a high sensitivity micropower Omnipolar Hall effect
switch IC with an internal pull up and pull down capability. 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 portable equipment the AH1897 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
AH1897 is available in a small low profile X1-DFN1216-4 package.
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). 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.
Features

Omnipolar Operation (North or South Pole)
 Supply Voltage of 1.6V to 3.6V
 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

Small Low Profile X1-DFN1216-4 Package

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
X1-DFN1216-4
Applications

Cover or Display Switch in Portable PCs
 Open and Close Detect for Cellular Phones
 Holster or Cover Detect for Cellular Phones and Tablet PCs

Digital Still, Video Cameras and Handheld Gaming Consoles
 Contact-Less
Switches
Notes: 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"
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
Note: 4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical.