Diodes AH1812 User Manual

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HIGH SENSIVITY 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.

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Features

H1812

Pin Assignments

(Top View)

X1-DFN1216-4

Applications

 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)

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.

 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

Typical Applications Circuit (Note 4)

Note: 4. C

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

IN

R

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

L

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Pin Descriptions

Package: X1-DFN1216-4

Pin

Number

1
2 GND Ground Pin
3 NC No Connection (Note 5)
4 OUTPUT Output Pin

Pad Pad Can be connected to GND or left open circuit

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

Pin

Name

V

DD

Power Supply Input

Function

Functional Block Diagram

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H1812

Cancellation

Offset

AH1812

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H1812

Absolute Maximum Ratings (Note 6) (@T

Symbol Characteristics Values Unit

VDD

V

DD_REV

I

OUTPUT

B Magnetic Flux Density Unlimited
PD
Ts Storage Temperature Range +150 °C

TJ

ESD HBM Human Body Model ESD capability 4 kV

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

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Recommended Operating Conditions (@T

Symbol Characteristic Conditions Rating Unit

VDD

TA

Electrical Characteristics (@T

Symbol Characteristic Conditions Min Typ Max Unit

V

OUT

Ioff Output leakage current Vout=3.6V, B < Brps — <0.1 1 µA

IDD(awake)

IDD(sleep)

IDD(avg)
IDD(avg) VDD = 3.0V
Tawake Awake Active Pulse Width (Note 8) — 50 100 µs

Tperiod Awake Period (Note 8) — 50 100 ms

D.C. Duty Cycle — 0.1 — %

Note: 8. When power is initially turned on, the operating VDD (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).

Supply Voltage (Note 7) 6 V
Reverse Supply Voltage -0.3 V
Output current (source and sink) 2 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 operate the

DD

Supply Voltage Operating 1.6 to 3.6 V

Operating Temperature Range Operating -40 to +85

= +25°C, VDD = 3V, unless otherwise specified.)

A

Output Low Voltage (on)

Supply Current

Average Supply Current

= +25°C, unless otherwise specified.)

A

= +25°C, unless otherwise specified.)

A

I

= 1mA

OUT

During ‘awake’ period — 2.3 — mA
During ‘sleep’ period — 2.5 — µA
VDD = 1.85V

— 0.1 0.2 V

— 4.3 8 µA
— 6 10 µA

C

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Magnetic Characteristics (Note 9) (@T

Symbol Characteristic Min Typ Max Unit

Bops (south pole to part marking side)
Bopn (north pole to part marking side) -40 -30 -16
Brps (south pole to part marking side)
Brpn (north pole to part marking side) -35 -20 -11
Bhy (|Bopx|-|Brpx|) Hysteresis - 10 -

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

= +25°C, VDD = 3V, unless otherwise specified.)

A

Operation Point

Release Point

(1mT=10 Gauss)

16 30 40

11 20 35

H1812

Gauss

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AH1812

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Typical Operating Characteristics

40

V

= 1.6V

DD

30
20
10

0

-10

Gaus s (G)

-20

-30

-40

-50 -25 0 25 50 75 100

Temperature (°C)

Switch Points vs Temperature

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40

VDD= 3.6V

30
20
10

0

-10

Gau ss (G)

-20

-30

-40

-50 -25 0 25 50 75 100

Temperature (° C)

Switc h Point s vs Temperat ure

Bops

Brps
Bhy

Brpn
Bopn

Bops
Brps

Bhy

Brpn
Bopn

40

VDD= 3.0V

30
20
10

0

-10

Gaus s (G)

-20

-30

-40

-50 -25 0 25 50 75 100

Temperature (° C)

Switch Point s vs Temperature

40

= +25°C

T

A

30
20
10

0

-10

Gaus s (G)

-20

-30

-40

1.5 1.8 2.1 2.4 2.7 3 3.3 3.6 3.9

Supply Voltage (V)

Switch Points vs Supply V oltage

H1812

Bops

Brps
Bhy

Brpn

Bopn

Bops
Brps

Bhys

Brpn
Bopn

10

9

(μA)

8

DD

7
6
5
4
3
2
1

Average Supply Current I

0

-50 - 25 0 25 50 75 100

3.6V

3.3V

1.6V

Temperature (°C)

A v er age Supply Current vs. Tempera t ur e

AH1812

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10

TA = +25° C

9

(μA)

8

DD

7
6
5
4
3
2
1

Average Supply Current I

0

1.6 1.9 2.2 2.5 2.8 3.1 3.4 3.7

Supply voltage (V)

Average Supply Current v s. Supply Voltage

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Ordering Information

Part Number Package Code Packaging

AH1812-FA-7 FA X1-DFN1216-4 3000/Tape & Reel -7

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H1812

7” Tape and Reel

Quantity Part Number Suffix

Marking Information

(1) Package Type: X1-DFN1216-4

Part Number Package Identification Code

AH1812-FA-7 X1-DFN1216-4 H2

AH1812

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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

3

1

Seating Plane

2

L

Pin #1 ID

︵

︶

E

NEW PRODUCT

Bottom View

D

e

C'0.2x45°

D

2

Z

E

b

H1812

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

0.11/0.25

0.57/0.63

Sensor Location

Suggested Pad Layout

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

(All dimensions in mm.)

X

1

C

Y

2

X1-DFN1216-4

Dimensions Value

C 0.65
X 0.25

Y

1

Y

X

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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This document is written in English but may be translated into multiple languages for reference. Onl y the English version of this document is the
final and determinative format released by Diodes Incorporated.

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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
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.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the

failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and

acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

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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

H1812

AH1812

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