Diodes AH1893 User Manual

Description

The AH1893 is a high sensitivity micropower Omnipolar Hall effect switch IC with internal pull up and pull down capability. Designed for portable and battery powered equipment such as cellular phones and portable PCs to home appliances and industrial applications, the average supply current is only 4.3µA at 1.85V. To support potable equipment the AH1893 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 AH1893 is available in small low profile X1-DFN1216-4 and SOT553 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

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 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 SOT553 and X1-DFN1216-4 Packages  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3)

HIGH SENSITIVITY MICROPOWER

OMNIPOLAR HALL-EFFECT SWITCH

Pin Assignments

(Top View)

X1-DFN1216-4

(Top View)

SOT553

Applications

 Open and Close Detect for Cellular Phones  Holster or Cover Detect for Cellular Phones and Tablet PCs  Cover or Display Switch in Portable PCs  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

H1893

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. C

AH1893

Document number: DS35740 Rev. 1 - 2

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

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Pin Descriptions

Package: X1-DFN1216-4

Pin Number Pin Name Function

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

Package: SOT553

Pin Number Pin Name Function

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

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

NEW PRODUCT

Functional Block Diagram

Power Supply Input

H1893

AH1893

Document number: DS35740 Rev. 1 - 2

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H1893

Absolute Maximum Ratings (Note 6) (@T

Symbol Parameter Rating Unit

VDD

DD_REV

OUTPUT

B Magnetic Flux Density Unlimited PD Ts Storage Temperature Range -65 to +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.

Supply Voltage (Note 7) 6 V Reverse Supply Voltage -0.3 V Output current (source and sink) 3 mA

Package Power Dissipation

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

Recommended Operating Conditions (@T

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Symbol Parameter Conditions Rating Unit

VDD

Electrical Characteristics (@T

Symbol Parameter Conditions Min Typ Max Unit

VOL Output Lo w Voltage (on) I VOH Output High Voltage (off) I Ioff Output Leakage Current V

IDD(awake)

IDD(sleep)

IDD(avg) Tawake Awake Time (Note 8) — 50 100 µs

Tperiod 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 Operating 1.6V to 3.6V V Operating Temperature Range Operating -40 to +85

= +25°C, VDD = 1.85V, unless otherwise specified.)

Supply Current

Average Supply Current

= +25°C, unless otherwise specified.)

X1-DFN1216-4 230 mW SOT553 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 IOff — < 0.1 1 µA

OUT

During ‘Awake’ Period, T

= +25°C, VDD = 3V

During ‘Sleep’ Period,

= +25°C, VDD = 3V

= +25°C, VDD = 1.85V

TA = +25°C, VDD = 3.6V

—

2.1 — mA

—

2.5 — mA

4.3 8 µA

—

7.2 13 µA

—

C

AH1893

Document number: DS35740 Rev. 1 - 2

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