AH1897

Document number: DS36470 Rev. 1 - 2

1 of 8

www.diodes.com

August 2013

© Diodes Incorporated

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: