Diodes Semiconductor Electronic Components Datasheet

AH1903 Datasheet

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

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 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 Semiconductor Electronic Components Datasheet

AH1903 Datasheet

HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH

No Preview Available !

Pin Descriptions

Package: X1-DFN1216-4

Pin Number

Pin Name

OUTPUT

GND

3 SEL

4 VDD

Pad Pad

Function

Output Pin

Ground Pin

Unipolar or Omnipolar Operation Select Pin;

For Unipolar operation, pull-up the SEL pin to VDD or leave it unconnected.

The SEL pin is internally pulled high.

For Omnipolar operation, connect the SEL pin to GND.

Power Supply Input

The center exposed pad - It is internally connected to VDD pin and should

not be connected to GND or any other signal on the PCB. The exposed pad

should be left open (unconnected) on the PCB layout.

Functional Block Diagram

AH1903

Absolute Maximum Ratings (Note 5) (@TA = +25°C, unless otherwise specified.)

Symbol

VDD

VDD_REV

IOUTPUT

ESD HBM

Supply Voltage (Note 6)

Reverse Supply Voltage

Output current (source and sink)

Magnetic Flux Density

Package Power Dissipation

Storage Temperature Range

Maximum Junction Temperature

Parameter

Human Body Model (HMB) ESD capability

X1-DFN1216-4

VDD, GND and OUTPUT pins

Logic SEL pin

Rating

-0.3

Unlimited

230

-65 to +150

150

Unit

°C

Notes:

5. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;

functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be

affected by exposure to absolute maximum rating conditions for extended periods of time.

6. The absolute maximum VDD of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to

operate the device at the absolute maximum rated conditions for any period of time.

AH1903

Document number: DS36568 Rev. 3 - 2

2 of 11

www.diodes.com

June 2014