Diodes AH1808 User Manual

A

H1808

HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

Description

The AH1808 is a high sensitivity, micro power Omnipolar Hall Effect

switch IC designed for portable and battery powered consumer

equipment such as cellular phones, PDA’s and portable PC’s to home

appliance and industrial applications. Based on two sensitive Hall

Effect plates and a chopper stabilized architecture the AH1808

provides a reliable solution over the whole operating range. To

support portable and battery powered equipment the design has been

optimized to operate over the supply range of 2.5V to 5.5V and

consumes only 24µW with a supply of 3V.

The single open drain output can switched on with either a North or

South pole of sufficient strength. When the magnetic flux density (B)

perpendicular to the package is larger than operate point (Bop) the

output is switched 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 (North or South pole) Operation

• High Sensitivity

• Single Open Drain Output

• Micropower Operation

• 2.5V to 5.5V Operating Range

• Chopper Stabilized Design Provides

 Superior Temperature Stability

 Minimal Switch Point Drift

 Enhanced Immunity to Stress

• Good RF Noise Immunity

• -40°C to +85°C Operating Temperature

• ESD (HBM) > 6KV

• Small Low Profile SOT553 and Industry Standard SC59 Packages

• 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.

AH1808

Document number: DS35655 Rev. 4 - 2

Pin Assignments

Applications

• Cover Switch in Clam-Shell or Slide Type Cellular Phones

• Display Switch for Portable PCs

• On/Off Switch for PDAs and Digital Cameras

• Contact-Less Switch in Consumer Products

• Smart E-meters

• Position, Proximity and Level Detection Contact-Less Switch in

Home Appliances and Industrial Applications

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SC59

(TOP View)

SOT553

February 2014

© Diodes Incorporated

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Typical Applications Circuit

H1808

Note: 4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF to 100nF.
R

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

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Pin Descriptions

Package: SC59

Pin

Number

1 VDD Power Supply Input

2 GND Ground

3 OUTPUT Output

Package: SOT553

Pin

Number

1 NC No Connection (Note 5)

2 GND Ground

3 NC No Connection (Note 5)

4 VDD Power Supply Input

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.

Pin

Name

Pin

Name

Function

Function

Functional Block Diagram

AH1808

Document number: DS35655 Rev. 4 - 2

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H1808

Absolute Maximum Ratings (Note 6) (@T

Symbol Parameter Values Unit

VDD

V

OUT

V

DD REV

V

OUT_REV

I

OUTPUT

Supply Voltage (Note 7) 7 V

Output Pin Voltage (Note 7) 7 V

Reverse Supply Voltage -0.3 V

Reverse Output Pin Voltage -0.3 V

Output current (source and sink) 2.5 mA

B Magnetic Flux Density Unlimited

PD

Package Power Dissipation SC59 and SOT553 230 mW

Ts Storage Temperature Range -65 to +150

TJ

Maximum Junction Temperature +150

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

of 7V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to

DD

Recommended Operating Conditions (@T

Symbol Characteristic Conditions Rating Unit

VDD

V

OUT_MAX

TA

Electrical Characteristics (@T

Symbol Characteristic Conditions Min Typ Max Unit

V

OUT_ON

Ioff Output Leakage Current

IDD(awake)

IDD(sleep)

IDD(sleep)

IDD(avg)

Tawake Awake Time (Note 8) — 75 125 µs

Tperiod Period (Note 8) — 75 125 ms

D.C. Duty Cycle — — 0.1 — %

Note: 8. When power is initially turned on, the operating VDD must be within its correct operating range (2.5V to 5.5V) to guaranteed the output sampling.
The output state is valid after the second operating cycle (typical 150ms).

Supply Voltage Operating 2.5 to 5.5 V

Maximum output pin voltage Operating 5.5 V

Operating Temperature Range Operating -40 to +85

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

A

Output On Voltage

Supply Current

Average Supply Current

= +25°C, unless otherwise specified.)

A

= +25°C, unless otherwise specified.)

A

I

= 1mA

OUT

V

= 5.5V, Output off

OUT

During ‘awake’ period,

= +25°C, VDD = 3V

T

A

During ‘awake’ period,
T

= -40°C to +85°C, VDD = 2.5V to 5.5V

A

During ‘sleep’ period,

= +25°C, VDD = 3V

T

A

During ‘sleep’ period,
T

= -40°C to +85°C, VDD = 2.5V to 5.5V

A

= +25°C, VDD = 3V

T

A

TA = -40°C to +85°C, VDD = 2.5V to 5.5V

°C

°C

°C

— 0.1 0.3 V

— < 0.1 1 µA

— 3 6 mA

— 3 12 mA

— 5 10 µA

— — 28 µA

— 8 16 µA

— — 40 µA

AH1808

Document number: DS35655 Rev. 4 - 2

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