Diodes AH1804 User Manual

AH1804

MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH

Description

The AH1804 is a micropower Omnipolar Hall effect switch IC
with a single output driver with internal pull up a nd pull down
capability. Designed for portable and battery powered
equipment such as cellular phones and portable PCs the
average supply current is only 12µA at 3.3V. To support
battery powered equipment the AH1804 can operate over the
supply range of 2.5V to 3.6V and uses a hibernating clocking
system to minimize the power consumption.

The output is activated with either a north or south pole of
sufficient strength. 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).

NEW PRODUCT

The AH1804 is available in SC59 and small low profile
DFN1216-4 packages.

Features

• Omnipolar operation (North or South pole)

• Low supply voltage 2.5V to 3.6V

• Micropower operation

• No external pull up resistors required

• Chopper stabilized design

o Superior temperature stability
o Extremely Low Switch-Point Drift
o Insensitive to Physical Stress

• Good RF noise immunity

• -40°C to 85°C operating temperature

• Small low profile DFN1216-4 and SC59 packages

• ESD (HBM) ＞ 5KV

• “Green” Molding Compound

Pin Assignments

( Top View )

GND

NC

4

3

2

1

Output

V

DD

DFN1216-4

(Top View)

3.

Output

GND 2.

1. V

DD

SC59

Applications

• Cover switch in clam-shell and slide cellular phones

• Cover switch in portable PC’s, Tablets and PDA

• Display screen open/close detect in Digital

camcorders

• Contact-less switch in portable battery powered
consumer and industrial products

Typical Application Circuit

Note: Cin is for power stabilization and to strengthen the noise immunity, C = 100nF or higher must be used.

AH1804

Document number: DS35314 Rev. 2 - 2

Cin

V

DD

2.5V to 3.6V

AH1804

GND

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Output

September 2011

© Diodes Incorporated

MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH

Pin Descriptions

Pin Name P/I/O Description

VDD

GND P/I Ground

Output O Output Pin

NC NC No Connection (Note 1)

Notes: 1. NC is “No Connection” which is not connected internally. This pin can be left open or tied to ground.

P/I Power Supply Input

Functional Block Diagram

V

DD

AH1804

NEW PRODUCT

Sleep/Awake Logic

and Power Switch

Hall

Plate

Hall

Plate

Cancellation

Cancellation

Offset

Amp

Offset

Amp

Latch

Latch

Output

Driver

Controller

Output

GND

AH1804

Document number: DS35314 Rev. 2 - 2

2 of 9

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September 2011

© Diodes Incorporated

AH1804

S

MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH

Absolute Maximum Ratings (T

Symbol Characteristics Values Unit

VDD

V

DD rev

B Magnetic flux density Unlimited

Ts Storage Temperature Range -65 to +150 °C
PD

TJ

Notes: 2. 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.

3. The absolute maximum of 5V is a transient stress rating and is not meant as functional operating conditions. It is not recommended to operate the
device at the absolute maximum rated conditions for any period of time.

NEW PRODUCT

Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time

Supply voltage (Note 3) 5.0 V
Reverse supply voltage -0.3 V

Package Power Dissipation
Maximum Junction Temperature 150 °C

Recommended Operating Conditions (T

Symbol Characteristics Conditions Rating Unit

VDD

TA

Notes: 4. Decoupling capacitor CIN = 100nF or higher must be used for full 2.5V to 3.6V supply range.

Supply Voltage
Operating Temperature Range Operating -40 to +85 °C

= 25°C, Note 2)

A

A

DFN1216-4 230
SC59 270

= 25°C)

CIN =0.1µF (Note 4)

2.5 to 3.6 V

mW

Electrical Characteristics (T

Symbol Characteristics Conditions Min Typ. Max Unit

VOL

VOH

Idd(en)

Idd(dis) Chip disable ⎯ 8 ⎯ µA

Idd(avg) Average supply current, ⎯ 12 ⎯ µA

Tawake Awake Time (Note 5) ⎯ 50 100 µs
Tperiod Period (Note 5) ⎯ 50 100 ms

D.C. Duty Cycle ⎯ 0.1 ⎯ %

Notes: 5. When power is initially on, the operating VDD (2.5V to 3.6V) must be applied to be guaranteed for the output sampling.
The output state is valid after the second operating phase (typical 100ms).

Output Low Voltage (on)
Output High Voltage (off)

upply current

= 25°C, V

A

I

OUT

I

OUT

Chip enable ⎯ 4 ⎯ mA

= 3.3V, unless otherwise specified)

DD

= 1mA
= -1mA VDD-0.2 VDD-0.1

⎯ 0.1 0.2 V

⎯⎯ V

AH1804

Document number: DS35314 Rev. 2 - 2

3 of 9

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September 2011

© Diodes Incorporated