Diodes AH1903 User Manual

A

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

NEW PRODUCT

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

IN

DD

, 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

4

Pad Pad

V

DD

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.

DD

pin and should

DD

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Absolute Maximum Ratings (Note 5) (@T

Symbol Parameter Rating Unit

VDD

V

DD_REV

I

OUTPUT

B Magnetic Flux Density Unlimited

PD

Ts Storage Temperature Range -65 to +150 °C

TJ

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

DD

= +25°C, unless otherwise specified.)

A

, GND and OUTPUT pins

V

DD

Logic SEL pin 6 kV

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8 kV

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Recommended Operating Conditions (@T

Symbol Parameter Conditions Rating Unit

VDD

TA

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

RU

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.)

A

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.

DD

Electrical Characteristics (cont.)

= +25°C, unless otherwise specified.)

A

I

= 1mA

OUT

I

= -1mA V

OUT

V

= 3.6V, Output off

OUT

During ‘awake’ period,
T

= +25°C, VDD = 3V

A

During ‘sleep’ period,
T

= +25°C, VDD = 3V

A

= +25°C, VDD = 1.8V

T

A

TA = +25°C, VDD = 3.6V

H1903

°C

— 0.1 0.2 V

-0.2 V

DD

—

—

—

2.5 — mA

—

—

—

—

—

—

-0.1

DD

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

—

mA

AH1903

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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)

A

23 33 47

VDD = 1.6V to 3.6V

= -40°C to +85°C

T

A

12 23 35

VDD = 1.6V to 3.6V

= -40°C to +85°C

T

A

(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

T

A

-47 -33 -23

VDD = 1.6V to 3.6V

= -40°C to +85°C

T

A

12 23 35

VDD = 1.6V to 3.6V

= -40°C to +85°C

T

A

VDD = 1.6V to 3.6V

= -40°C to +85°C

T

A

21 33 48

-48 -33 -21

9 23 38

-35 -23 -12

-38 -23 -9

Gauss

AH1903

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H1903

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

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AH1903 in Omnipolar 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

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Application Notes (cont.)

Applications Circuit 1 – Unipolar Operation

Connecting the SEL pin to VDD, a voltage greater than 1.4V or leaving the SEL pin unconnected configures the AH1903 into Unipolar mode, only

detecting South pole of sufficient strength from the part mark side of the package. In Unipoalr mode, North pole fields will not switch on the

output.

Applications Circuit 2 – Omnipolar Operation

Connecting the SEL pin to ground configures the AH1903 into Omnipolar mode, detecting both North and South magnetic fields of sufficient

strength.

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OUTPUT

AH1903

Cin

V

DD

H1903

GND

SEL

Applications Circuit 3 – Adjustable Sensor Type

To enhance flexibility within the application the sensor operation modes can be selected with a standard logic signal allowing it to be controlled

by a micro-controller or a logic source. This allows the sensor type to be changed within the application without a hardware change. Whenever

the Hall switch type is changed, the selection changeover should allow two awake period for the output to be valid.

AH1903

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H1903

Application Notes (cont.)

Sensor Type Change Timing and Valid Output

Whenever type selection SEL pin input is changed, allow for band selection changeover to complete and stabilize. The output is valid only after

the second complete operating ‘awake’ phase. Time taken for the output to be valid, after the SEL change, depends on timing of SEL change

during the sleep and awake phase; this time can range from 100ms typical and 200.1ms maximum.

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AH1903

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V

Typical Operating Characteristics

Operating Switch Points in Unipolar Operation (SEL = No connection or SEL =

60

V

= 1.6V, SE L = High (VDDor No connection)

DD

50

40

30

Gauss (G)

20

10

0

-50-25 0 255075100

Temp erature (° C)

Switch Points vs Temperature

60

V

= 3.6V, SEL = High (VDDor No Connection)

DD

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50

40

30

Gauss (G)

20

10

0

-50 -25 0 25 50 75 100

Temp erature (° C)

Switch Points vs Temperature

Bops

Brps

Bhys

Bops

Brps

Bhys

H1903

)

DD

60

V

= 1.8V, SEL= High (VDDor No connec tion)

DD

50

40

30

Gauss (G)

20

10

0

-50-25 0 255075100

Temp erature (° C)

Switch Points vs Temperature

60

TA= +25 °C, SEL = High (VDDorNo connec tion)

50

40

30

Gauss (G )

20

10

0

1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9

Temper ature (° C)

Switch Points vs Temperature

Bops

Brps

Bhys

Bops

Brps

Bhy

AH1903

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Typical Operating Characteristics (cont.)

Operating Switch Points in Omnipolar Operation (SEL = GND)

H1903

60

V

= 1. 6V, SEL = Lo w (GND)

DD

50

40

30

20

10

0

-10

Gauss (G)

-20

-30

-40

-50

-60

-50 -25 0 25 50 75 100

Bops
Brps

Bhy

Brpn
Bopn

Temp erature (° C)

Switch Points vs Temperature

60

V

= 3.6V, SEL = Low (GND)

DD

50

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40

30

20

10

0

-10

Gauss (G)

-20

-30

-40

-50

-60

-50-25 0 255075100

Bops
Brps

Bhy

Brpn

Bopn

Temperature (° C)

Switch Points vs Temperature

Average Supply Current - Unipolar or Omnipolar Operations

10

9

(μA)

8

DD

7

6

5

4

3

2

1

0

-50-250 255075100

Average Supply Current I

Temper ature (°C)

Average Supply Current vs. Temperature

3.6V

1.8V

1.6V

60

V

= 1.8V , SEL = Low (GND)

DD

50

40

30

20

10

0

-10

Gauss (G )

-20

-30

-40

-50

-60

-50 -25 0 25 50 75 100

Bops

Brps

Bhy

Brpn
Bopn

Temper ature (°C)

60

TA= +25 °C, SEL = Low (GND)

50

40

30

20

10

0

-10

Gauss (G)

-20

-30

-40

-50

-60

1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9

Sw itch Po ints vs Tempe rature

Bops

Brps

Bhy

Brpn
Bopn

Temper ature (°C)

Switch Points vs Temperature

10

TA= +25 °C

9

(μA)

8

DD

7

6

5

4

3

2

1

0

Average Sup ply Current I

1.5 1.8 2. 1 2. 4 2.7 3 3. 3 3.6 3.9

Supply Voltage (V)

Average Supply Current vs. Supply Voltage

AH1903

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Ordering Information

H1903

Part Number

AH1903-FA-7 FA X1-DFN1216-4 3000/Tape & Reel -7

Marking Information

(1) Package Type: X1-DFN1216-4

NEW PRODUCT

Package

Code

Part Number Package Identification Code

AH1903-FA-7 X1-DFN1216-4 F3

Packaging

Quantity Part Number Suffix

7” Tape and Reel

AH1903

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Package Outline Dimensions (All dimensions in mm.)

Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.

(1) Package Type: X1-DFN1216-4

A

A

A

3

1

Seating Plane

2

L

︵

E

Pin #1 ID

D

e

︶

D

C'0.2x45°

2

E

NEW PRODUCT

Z

Bottom View

b

H1903

X1-DFN1216-4

Dim Min Max Typ

A 0.47 0.53 0.50
A1 0.00 0.05 0.02
A3 -- -- 0.13

b 0.15 0.25 0.20

D 1.15 1.25 1.20
D2 0.75 0.95 0.85

E 1.55 1.65 1.60
E2 0.55 0.75 0.65

e - - 0.65

L 0.20 0.30 0.25

Z - - 0.175

All Dimensions in mm

Sensor Location (To be confirmed)

Suggested Pad Layout

Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.

(1) Package Type: X1-DFN1216-4

X

1

C

AH1903

Document number: DS36568 Rev. 2 - 2

Y

2

Y

1

Y

X

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Dimensions Value

C 0.65
X 0.25

X1 0.90

Y 0.50
Y1 0.70
Y2 2.00

All Dimensions in mm

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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).

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final and determinative format released by Diodes Incorporated.

NEW PRODUCT

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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

labeling can be reasonably expected to result in significant injury to the user.

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2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

IMPORTANT NOTICE

LIFE SUPPORT

H1903

AH1903

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