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AH1903

Document number: DS36568 Rev. 2 - 2

1 of 12

www.diodes.com

January 2014

NEW PRODUCT

H1903

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 only 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).

Features

• Unipolar or Omnipolar Operation

 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

 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) on V

, 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)

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

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. C

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 2 3 4 5 6 ... 11 12

Indice de contenidos

AH1903 Document number: DS36568 Rev. 2 - 2 1 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903HIGH SENSITIVITY MICROPOWER

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AH1903 Document number: DS36568 Rev. 2 - 2 10 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Ordering Information P

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AH1903 Document number: DS36568 Rev. 2 - 2 11 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Package Outline Dimensio

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AH1903 Document number: DS36568 Rev. 2 - 2 12 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 IMPORTANT NOTICE DIODE

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AH1903 Document number: DS36568 Rev. 2 - 2 2 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Pin Descriptions Package

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AH1903 Document number: DS36568 Rev. 2 - 2 3 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Recommended Operating Co

Pagina 7

AH1903 Document number: DS36568 Rev. 2 - 2 4 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Magnetic Characteristics

Pagina 8 - Switch Points vs Temperature

AH1903 Document number: DS36568 Rev. 2 - 2 5 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Application Notes

Pagina 9 - Average Supply Cu

AH1903 Document number: DS36568 Rev. 2 - 2 6 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Application Notes (cont.)

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AH1903 Document number: DS36568 Rev. 2 - 2 7 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Application Notes (cont.)

Pagina 11

AH1903 Document number: DS36568 Rev. 2 - 2 8 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Typical Operating Charact

Pagina 12 - NEW PRODUCT

AH1903 Document number: DS36568 Rev. 2 - 2 9 of 12 www.diodes.com January 2014© Diodes Incorporated NEW PRODUCT AH1903 Typical Operating Charact

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