AH1894-FA-7 Datasheet AH1894-FA-7 | P1-P3

AH1894

Document number: DS35741 Rev. 1 - 2

1 of 13

www.diodes.com

July 2013

NEW PRODUCT

H1894

PROGRAMMABLE HIGH SENSITIVITY

MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

Description

The AH1894 is a high sensitivity micropower magnetic range

selectable 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 power

consumption is only 8uW at 1.85V. To support portable equipment the

AH1894 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 AH1894 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. The user can select one of two magnetic

sensitivity bands via the BSEL pin without the addition of any external

components allowing a flexible but small solution. The band select

can be hardwired or be changed on the fly via a logic source such as

a micro-controller. When the magnetic flux density (B) 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

 Omnipolar Operation (North or South pole)

 Programmable Operate and Release Points

 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

 High ESD capability of 8kV (Human Body Model) on V

, GND

and OUTPUT Pins

 Small Low Profile X1-DFN1216-4 and SOT553 Packages

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

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

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 Switches 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

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.

AH1894

Document number: DS35741 Rev. 1 - 2

2 of 13

www.diodes.com

July 2013

NEW PRODUCT

H1894

Pin Descriptions

Package: X1-DFN1216-4

Pin Number Pin Name Function

1 OUTPUT Output Pin

Power Supply Input

3 BSEL Band Select

4 GND Ground Pin

Package: SOT553

Pin Number Pin Name Function

Power Supply Input

2 NC No Connection (Note 5)

3 BSEL Band Select

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.

Functional Block Diagram

AH1894

Document number: DS35741 Rev. 1 - 2

3 of 13

www.diodes.com

July 2013

NEW PRODUCT

H1894

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) 3.5 mA

B Magnetic Flux Density Unlimited

Package Power Dissipation

X1-DFN1216-4 230 mW

SOT553 230 mW

Ts Storage Temperature Range -65 to +150 °C

Maximum Junction Temperature 150 °C

ESD HBM Human Body Model (HMB) ESD capability

VDD, GND and OUTPUT pins 8 kV

BSEL pin 6 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

= 1.85V, unless otherwise specified.)

Symbol Parameter Conditions Min Typ Max Unit

Output Low Voltage (on) I

OUT

= 1mA — 0.1 0.2 V

Output High Voltage (off) I

OUT

= -1mA V

-0.2 V

-0.1 — V

Ioff Output Leakage Current V

OUT

= 3.6V, Output off - < 0.1 1 µA

SEL_LB

BSEL pin input voltage – Low Band 0 — 0.5 V

SEL_HB

BSEL pin input voltage – High Band 1.4 — 3.6 V

PD_BSEL

BSEL pin internal pull-down resistor (Note 8) — 50 — kΩ

(awake)

Supply Current

During ‘awake’ period,

= +25°C, V

= 3V

—

2.1 — mA

(sleep)

During ‘sleep’ period,

= +25°C, V

= 3V

—

2.5 — mA

(avg)

Average Supply Current

= +25°C, V

= 1.85V

— 4.3 8 µA

= +25°C, V

= 3.6V

— 7.2 13 µA

Tawake Awake Time (Note 9) — 50 100 µs

Tperiod Period (Note 9) — 50 100 ms

D.C. Duty Cycle (Note 10) — 0.1 — %

Notes: 8. BSEL pin internal pull-down resistor is only active during AWAKE time

9. When power is initially on, the operating V

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

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

10. Transition time varies dependant on the timing of BSEL activation during the sleep and awake phases.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P13

AH1894-FA-7

Mfr. #:

Buy AH1894-FA-7

Manufacturer:

Description:

Magnetic Sensors Board Mount Hall Effect / Magnetic Sensors Prog HS Hall-Effect 1.6V to 3.6V Omni

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

AH1894-FA-7