Diodes AH1903 User Manual

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

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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

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)

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 supply pin as possible.

is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to the

, GND

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

H1903

AH1903

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Pin Descriptions

Package: X1-DFN1216-4

Pin Number Pin Name Function

1 OUTPUT Output Pin

2 GND Ground Pin

Unipolar or Omnipolar Operation Select Pin;

3 SEL

Pad Pad

For Unipolar operation, pull-up the SEL pin to V 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 V 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

H1903

or leave it unconnected.

pin and should

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Absolute Maximum Ratings (Note 5) (@T

Symbol Parameter Rating Unit

VDD

DD_REV

OUTPUT

B Magnetic Flux Density Unlimited

Ts Storage Temperature Range -65 to +150 °C

ESD HBM Human Body Model (HMB) ESD capability

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

AH1903

Document number: DS36568 Rev. 2 - 2

Supply Voltage (Note 6) 6 V

Reverse Supply Voltage -0.3 V

Output current (source and sink) 3 mA

Package Power Dissipation X1-DFN1216-4 230 mW

Maximum Junction Temperature 150 °C

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

= +25°C, unless otherwise specified.)

, GND and OUTPUT pins

Logic SEL pin 6 kV

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Recommended Operating Conditions (@T

Symbol Parameter Conditions Rating Unit

VDD

Electrical Characteristics (@T

Symbol Parameter Conditions Min Typ Max Unit

VOL

VOH

SEL Low Omnipolar operation selected 0 — 0.5 V

SEL High Unipolar operation selected 1.4 — 3.6 V

SEL

Ioff Output Leakage Current

IDD(awake)

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IDD(sleep)

IDD(avg)

Tawake Awake Time (Note 8)

Tperiod Period (Note 8)

D.C. Duty Cycle

Notes: 7. SEL pin internal pull-up resistor is only active during AWAKE time.

Supply Voltage Operating 1.6V to 3.6V V

Operating Temperature Range Operating -40 to +85

= +25°C, VDD = 1.8V, unless otherwise specified.)

Output Low Voltage (on)

Output High Voltage (off)

BSEL pin internal pull-up resistor (Note 7)

Supply Current

Average Supply Current

8. When power is initially on, the operating V The output state is valid after the second operating phase (typical 100ms).

(1.6V to 3.6V) must be applied to guarantee the output sampling.

Electrical Characteristics (cont.)

= +25°C, unless otherwise specified.)

= 1mA

OUT

= -1mA V

OUT

= 3.6V, Output off

OUT

During ‘awake’ period, T

= +25°C, VDD = 3V

During ‘sleep’ period, T

= +25°C, VDD = 3V

= +25°C, VDD = 1.8V

TA = +25°C, VDD = 3.6V

H1903

°C

— 0.1 0.2 V

-0.2 V

—

2.5 — mA

—

-0.1

50 kΩ

< 0.1 1 µA

2.1

4.3 8 µA

7.2 13 µA

50 100 µs

50 100 ms

0.1 — %

— V

—

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H1903

Magnetic Characteristics (Note 9 &10) (T

Unipolar Operation: SEL = High ( > 1.4V to VDD or No connection)

Symbol Characteristics Test Condition Min Typ Max Unit

Bops (south pole to part marking side) Operation Point

Brps (south pole to part marking side) Release Point

Bhy (|Bopx|-|Brpx|) Hysteresis — 10 —

Omnipolar Operation: SEL = Low (GND or <0.5V)

= +25°C, VDD = 1.8V, unless otherwise specified)

23 33 47

VDD = 1.6V to 3.6V

= -40°C to +85°C

12 23 35

VDD = 1.6V to 3.6V

= -40°C to +85°C

(1mT=10 Gauss)

21 33 48

9 23 38

(1mT=10 Gauss)

Gauss

Symbol Characteristics Test Condition Min Typ Max Unit

23 33 47

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Bops (south pole to part marking side)

Operation Point

Bopn (north pole to part marking side)

Brps (south pole to part marking side)

Release Point

Brpn (north pole to part marking side)

Bhy (|Bopx|-|Brpx|) Hysteresis — 10 —

Notes: 9. Typical data is at TA = +25°C, VDD = 1.8V.

10. Maximum and minimum parameters values over operating temperature range are not tested in production, they are guaranteed by design, characterization and process control. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.

VDD = 1.6V to 3.6V

= -40°C to +85°C

-47 -33 -23

VDD = 1.6V to 3.6V

= -40°C to +85°C

12 23 35

VDD = 1.6V to 3.6V

= -40°C to +85°C

VDD = 1.6V to 3.6V

= -40°C to +85°C

21 33 48

-48 -33 -21

9 23 38

-35 -23 -12

-38 -23 -9

Gauss

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