AH1897-FA-7 Datasheet AH1897-FA-7 | P1-P3

AH1897

Document number: DS36470 Rev. 1 - 2

1 of 8

www.diodes.com

August 2013

NEW PRODUCT

H1897

HIGH SENSITIVITY MICROPOWER

OMNIPLOAR HALL-EFFECT SWITCH

Description

The AH1897 is a high sensitivity micropower Omnipolar Hall effect

switch IC with an internal pull up and pull down capability. 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 portable equipment the AH1897 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

AH1897 is available in a small low profile X1-DFN1216-4 package.

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). 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.

Features

 Omnipolar Operation (North or South Pole)

 Supply Voltage of 1.6V to 3.6V

 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

 Small Low Profile X1-DFN1216-4 Package

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

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

Pin Assignments

(Top View)

X1-DFN1216-4

Applications

 Cover or Display Switch in Portable PCs

 Open and Close Detect for Cellular Phones

 Holster or Cover Detect for Cellular Phones and Tablet PCs

 Digital Still, Video Cameras and Handheld Gaming Consoles

 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. C

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

AH1897

Document number: DS36470 Rev. 1 - 2

2 of 8

www.diodes.com

August 2013

NEW PRODUCT

H1897

Pin Descriptions

Package: X1-DFN1216-4

Pin Number Pin Name Function

Power Supply Input

2 GND Ground Pin

3 NC No Connection (Note 5)

4 OUTPUT Output Pin

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

Functional Block Diagram

AH1897

Document number: DS36470 Rev. 1 - 2

3 of 8

www.diodes.com

August 2013

NEW PRODUCT

H1897

Absolute Maximum Ratings (Note 6) (@T

= +25°C, unless otherwise specified.)

Symbol Parameter Rating Unit

Supply Voltage (Note 7) 6 V

DD_REV

Reverse Supply Voltage -0.3 V

OUTPUT

Output current (source and sink) 3 mA

B Magnetic Flux Density Unlimited

Package Power Dissipation X1-DFN1216-4 230 mW

Ts Storage Temperature Range -65 to +150 °C

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

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

= +25°C, unless otherwise specified.)

Symbol Parameter Conditions Rating Unit

Supply Voltage Operating 1.6V to 3.6V V

Operating Temperature Range Operating -40 to +85

C

Electrical Characteristics (@T

= +25°C, V

= 3.0V, unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

Output Low Voltage (on)

OUT

= 1mA

— 0.1 0.2 V

Output High Voltage (off)

OUT

= -1mA V

-0.2 V

-0.1

— V

Ioff Output Leakage Current

OUT

= 3.6V, Output off

—

< 0.1 1 µA

(awake)

Supply Current

During ‘awake’ period, —

2.1 — mA

(sleep)

During ‘sleep’ period, —

2.5 — mA

(avg)

Average Supply Current

= +25°C, V

= 1.8V

—

4.3 8 µA

= +25°C, V

= 3.6V

—

7.2 13 µA

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 V

(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).

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AH1897-FA-7

Mfr. #:

Buy AH1897-FA-7

Manufacturer:

Description:

Magnetic Sensors Board Mount Hall Effect / Magnetic Sensors Hall Effect Switch 1.6V to 3.6V 4.3uA

Lifecycle:

New from this manufacturer.

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AH1897-FA-7