Diodes AH1902 User Manual

HIGH SENSITIVITY MICROPOWER

OMNIPLOAR HALL-EFFECT SWITCH

Description

The AH1902 is a high sensitivity micropower Omnipolar Hall effect

switch IC with internal pull up and pull down capability. Designed for

portable and 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 4.3uA at

1.8V. To support potable equipment the AH1902 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

AH1902 is available in small low profile X1-DFN1216-4 and X2-

DFN2015-6 packages.

The 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) and held until B is lower than

release point (Brp).

Features

NEW PRODUCT

• 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

 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)

• Small Low Profile X1-DFN1216-4 and X2-DFN2015-6 Packages

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

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

Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.

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.

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 Applications Circuit

H1902

Note: 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

AH1902

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the supply pin as possible.

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Pin Descriptions

Package: X1-DFN1216-4

Pin Number Pin Name Function

1 OUTPUT Output Pin

2 GND Ground Pin

3 NC No Connection (Note 5)

4 VDD Power Supply Input

Pad Pad

Package: X2-DFN2015-6

Pin Number Pin Name Function

1 OUTPUT Output Pin

2 NC No Connection (Note 5)

3 NC No Connection (Note 5)

4 GND Ground Pin

5 NC No Connection (Note 5)

6 VDD Power Supply Input

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Pad Pad

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

The center exposed pad - It is internally connected to V be connected to GND or any other signal on the PCB. The exposed pad should be left open (unconnected) on the PCB layout.

The center exposed pad – No connection internally. The exposed pad can be left open (unconnected) or tied to the GND on the

PCB layout.

Functional Block Diagram

pin and should not

H1902

AH1902

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Absolute Maximum Ratings (Note 6) (@T

Symbol Parameter Rating Unit

VDD Supply Voltage (Note 7) 6 V

Reverse Supply Voltage -0.3 V

DD_REV

Output current (source and sink) 3 mA

OUTPUT

B Magnetic Flux Density Unlimited

PD Package Power Dissipation

Ts Storage Temperature Range -65 to +150 °C

TJ Maximum Junction Temperature 150 °C

ESD HBM Human Body Model (HMB) ESD capability 8 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 operate the device at the absolute maximum rated conditions for any period of time.

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

Recommended Operating Conditions (@T

Symbol Parameter Conditions Rating Unit

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VDD Supply Voltage Operating 1.6V to 3.6V V

TA Operating Temperature Range Operating -40 to +85

Electrical Characteristics (@T

Symbol Parameter Conditions Min Typ Max Unit

VOL Output Low Voltage (on) I

VOH Output High Voltage (off) I

Ioff Output Leakage Current V

IDD(awake)

Supply Current

IDD(sleep)

IDD(avg) Average Supply Current

Tawake Awake Time (Note 8)

Tperiod Period (Note 8)

D.C. Duty Cycle

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).

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

= +25°C, unless otherwise specified.)

X1-DFN1216-4 230 mW

X2-DFN2015-6 230 mW

= +25°C, unless otherwise specified.)

= 1mA — 0.1 0.2 V

OUT

= -1mA VDD-0.2 VDD-0.1 — V

OUT

= 3.6V, Output off

OUT

During ‘awake’ period,

= +25°C, VDD = 3V

During ‘sleep’ period,

= +25°C, VDD = 3V

= +25°C, VDD = 1.8V — 4.3 8 µA

TA = +25°C, VDD = 3.6V

—

< 0.1 1 µA

2.1 — mA

2.5 — µA

7.2 13 µA

50 100 µs

50 100 ms

0.1 — %

H1902

°C

AH1902

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