Diodes AH1895 - Manual

AH1895
Document number: DS35742 Rev. 1 - 2
1 of 10
www.diodes.com
July 2013
© Diodes Incorporated
NEW PROD
UC
T
AH1895
MEDIUM SENSITIVITY MICROPOWER
OMNIPLOAR HALL-EFFECT SWITCH
Description
The AH1895 is a medium sensitivity micropower Omnipolar Hall effect
switch IC with internal pull up and pull down capability. Designed for
portable and battery powered equipment such as cellular phones and
portable PCs to home appliances and industrial applications, the
average supply current is only 4.3uA at 1.85V. To support portable
equipment the AH1895 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 AH1895 is available in
small low profile X1-DFN1216-4 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). 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
 Medium 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 and SOT553 Packages
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
X1-DFN1216-4
(Top View)
SOT553
Applications

Open and Close Detect for Cellular Phones
 Holster or cover detect for cellular phones and Tablet PCs

Cover or Display Switches in Portable PCs

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. 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.