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AH1812

HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

Description

The AH1812 is a high sensitivity micropower Omnipolar Hall effect

switch IC with an open drain output. Designed for portable and battery

powered equipment such as cellular phones and portable PCs, the

average supply current is only 4.3µA at 1.85V. To support potable

equipment the AH1812 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 AH1812 is available in

small low profile X1-DFN1216-4 package

The open drain output is activated with either a North or South 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). The output is turned off when

B becomes lower than the release point (Brp). The output will remain

off when there is no magnetic field.

Pin Assignments

(Top View)

V

DD

1

4

OUTPUT

NEW PRODUCT

GND

2

3

NC

X1-DFN1216-4

Features



Omnipolar Operation (North or South Pole)

Supply Voltage of 1.6V to 3.6V

High Sensitivity

Micropower Operation

Chopper Stabilized Design Provides:



Superior Temperature Stability



Extremely Low Switch-Point Drift



Enhanced Immunity to Stress

Open Drain Output for System Flexibility

Good RF Noise Immunity

-40°C to +85°C Operating Temperature

Small and Low Profile X1-DFN1216-4 Package

Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

Halogen and Antimony Free. “Green” Device (Note 3)

Applications



Cover or Display Switch in Portable PCs

Open and Close Detect for Cellular Phones

Holster Detect for Cellular Phones and Tablet PCs

Digital Still and Video Cameras

Contact-Less Switches



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.

Typical Applications Circuit

(Note 4)

1.6V to 3.6V

V

DD

R

L

C

IN

AH1812

OUTPUT

GND

Note:

4. C

IN

is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF to 100nF.

R

L

is the pull-up resistor, the recommended resistance is 10kΩ to 100kΩ.

AH1812

Document number: DS36171 Rev. 2 - 2

1 of 8

www.diodes.com

October 2015

AH1812

Pin Descriptions

Package: X1-DFN1216-4

Number

1

2

3

4

Pad

Note:

Name

V

DD

GND

NC

OUTPUT

Pad

Power Supply Input

Function

NEW PRODUCT

Ground Pin

No Connection (Note 5)

Output Pin

Can be connected to GND or left open circuit

5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.

Functional Block Diagram

V

DD

Sleep/Awake Logic

and Power Switch

Hall

Plate

Amp

Latch

and

Output

Driver

Controller

OUTPUT

Offset

Cancellation

GND

AH1812

Document number: DS36171 Rev. 2 - 2

2 of 8

www.diodes.com

October 2015

AH1812

Absolute Maximum Ratings

(Note 6) (@T

A

= +25°C, unless otherwise specified.)

Symbol

V

DD

V

DD_REV

I

OUTPUT

B

P

D

Ts

T

J

ESD HBM

Notes:

Characteristics

Supply Voltage (Note 7)

Reverse Supply Voltage

Output current (source and sink)

Magnetic Flux Density

Package Power Dissipation

Storage Temperature Range

Maximum Junction Temperature

Human Body Model ESD capability

X1-DFN1216-4

Values

6

-0.3

2

Unlimited

230

+150

150

4

Unit

V

mA

mW

°C

kV

NEW PRODUCT

6. 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.

7. The absolute maximum V

DD

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.

Recommended Operating Conditions

(@T

A

= +25°C, unless otherwise specified.)

Symbol

V

DD

T

A

Characteristic

Supply Voltage

Operating Temperature Range

Operating

Conditions

Rating

1.6 to 3.6

-40 to +85

Unit

V

C

Electrical Characteristics

Symbol

V

OUT

Ioff

I

DD

(awake)

I

DD

(sleep)

I

DD

(avg)

I

DD

(avg)

Tawake

Tperiod

D.C.

Note:

(@T

A

= +25°C, V

DD

= 3V, unless otherwise specified.)

Conditions

I

OUT

= 1mA

Vout=3.6V, B < Brps

During ‘awake’ period

During ‘sleep’ period

V

DD

= 1.85V

V

DD

= 3.0V

(Note 8)

Min

—

Typ

0.1

<0.1

2.3

2.5

4.3

6

50

0.1

Max

0.2

1

—

8

10

100

—

Unit

V

µA

mA

µA

µs

ms

%

Characteristic

Output Low Voltage (on)

Output leakage current

Supply Current

Average Supply Current

Awake Active Pulse Width

Awake Period

Duty Cycle

8. When power is initially turned on, the operating V

DD

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

The output state is valid after the second operating cycle (typical 100ms).

Tperiod

Tawake

I

DD

(awake)

Tsleep

Sample and output

latched

I

DD

(avg)

I

DD

(sleep)

0

AH1812

Document number: DS36171 Rev. 2 - 2

3 of 8

www.diodes.com

October 2015

AH1812

Magnetic Characteristics

(Note 9) (@T

A

= +25°C, V

DD

= 3V, unless otherwise specified.)

(1mT=10 Gauss)

Symbol

Bops (south pole to part marking side)

Bopn (north pole to part marking side)

Brps (south pole to part marking side)

Brpn (north pole to part marking side)

Bhy (|Bopx|-|Brpx|)

Characteristic

Operation Point

Release Point

Hysteresis

Min

16

-40

11

-35

-

Typ

30

-30

20

-20

10

Max

40

-16

35

-11

-

Unit

Gauss

NEW PRODUCT

Note:

9. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.

OUTPUT

(off-state) V

DD

(off-state)

( Output Voltage )

Turn

on

(on-state)

V

SAT

B

hy

Turn

off

Turn

off

B

hy

Turn

on

(on-state)

V

SAT

B

opn

B

rpn

0

B

rps

B

ops

( Magnetic Flux Density B )

AH1812

Document number: DS36171 Rev. 2 - 2

4 of 8

www.diodes.com

October 2015

AH1812

Typical Operating Characteristics

40

30

20

V

DD

= 1.6V

Bops

40

30

20

V

DD

= 3.0V

Bops

Brps

Bhy

Brps

Gauss (G)

10

0

-10

-20

-30

-40

-50

-25

0

25

50

75

Bhy

10

0

NEW PRODUCT

-10

-20

-30

-40

Brpn

Bopn

100

Brpn

Bopn

-50

-25

0

25

50

75

100

Temperature (°C)

Switch Points vs Temperature

40

30

20

40

Switch Points vs Temperature

T

A

= +25 C

Bops

V

DD

= 3.6V

Bops

Brps

30

20

Gauss (G)

10

0

Bhy

10

0

-10

-20

-30

-40

Brps

Bhys

-10

-20

-30

-40

-50

-25

0

25

50

75

100

Brpn

Bopn

Brpn

Bopn

1.5

1.8

2.1

2.4

2.7

3

3.3

3.6

3.9

Temperature (°C)

Supply Voltage (V)

Switch Points vs Temperature

Average Supply Current I

DD

(μA)

10

Switch Points vs Supply Voltage

10

9

8

7

6

5

4

3

2

1

0

1.6

1.9

2.2

2.5

2.8

3.1

3.4

3.7

Average Supply Current I

DD

(μA)

9

8

7

6

5

4

3

2

1

0

-50

-25

0

25

50

75

100

T

A

= +25 C

3.6V

3.3V

1.6V

Temperature ( C)

Supply voltage (V)

Average Supply Current vs. Temperature

Average Supply Current vs. Supply Voltage

AH1812

Document number: DS36171 Rev. 2 - 2

5 of 8

www.diodes.com

October 2015

AH1812

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