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PDF AH1903 Data sheet ( Hoja de datos )

Número de pieza AH1903
Descripción HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH
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AH1903
HIGH SENSITIVITY MICROPOWER
UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH
Description
The AH1903 is a high sensitivity micropower Omnipolar or Unipolar
selectable Hall effect switch IC with internal pull up and pull down
capability. Designed for 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 portable equipment the AH1903 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 AH1903 is available in a small low profile
X1-DFN1216-4 package.
The user can change the Hall switch function between Unipolar and
Omnipolar operation via the Select (SEL) pin. If the SEL pin is open
circuit or pulled high the AH1903 operates in Unipolar switch mode
detecting magnetic field direction with a South pole to the part mark
side of the package. If the SEL pin is pulled low the AH1903 functions
as a Omnipolar switch detecting either a North or South pole. The
output is activated with a 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).
Pin Assignments
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
Features
Unipolar or Omnipolar Operation
ƒ Operation can be changed by a logic source or fixed via
PCB design with no additional components
Supply Voltage of 1.6V to 3.6V
High Sensitivity
Micropower Operation
Chopper Stabilized Design Provides
ƒ Superior Temperature Stability
ƒ Minimal Switch Point Drift
ƒ 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) on VDD, GND
and OUTPUT Pins
Small Low Profile X1-DFN1216-4 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Typical Application Circuit
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.
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.
AH1903
Document number: DS36568 Rev. 3 - 2
1 of 11
www.diodes.com
June 2014
© Diodes Incorporated

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AH1903 pdf
AH1903
Application Notes
The AH1903 includes a Hall switch function select pin (SEL) so that the AH1903 can be changed between an Unipolar or an Omnipolar Hall
Switch operation to fit a multitude of applications. The diagrams below show the different switching functions between the Unipolar and the
Omnipolar Hall switch types.
AH1903 in Unipolar Operation
In Unipolar mode, the sensor detects the magnetic flux density perpendicular to the part marking surface with magnetic field direction only from
the back to the front of the package as shown below. This magnetic field direction is similar to having a South pole on the part marking side or a
North pole to the back of the package.
Magnetic Field Direction for Unipolar Mode Operation
AH1903 in Omnipolar Operation
In Omnipolar mode, the sensor detects the magnetic flux density perpendicular to the part marking surface with magnetic field directions from the
front to the back as well as from the back to the front of the package as shown below. The sensor detects both North or South pole to the part
marking side or to the back of the package.
Magnetic Field Directions for Omnipolar Mode Operation
The AH1903 includes a function select pin (SEL) to change the device type between Unipolar and Omnipolar operations. The SEL pin can be
hard wired within the application circuit or can be changed on the fly by using the SEL pin as a logic input. This feature allows the AH1903
operating mode to be changed by firmware within the application without the addition of any external components. If the SEL pin is left open
circuit the AH1903 defaults to Unipolar mode.
AH1903
Document number: DS36568 Rev. 3 - 2
5 of 11
www.diodes.com
June 2014
© Diodes Incorporated

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AH1903 arduino
AH1903
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2014, Diodes Incorporated
www.diodes.com
AH1903
Document number: DS36568 Rev. 3 - 2
11 of 11
www.diodes.com
June 2014
© Diodes Incorporated

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