Diodes AH180 User Manual

AH180

MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR

SWITCH

Description

AH180 is a micro-power Omnipolar Hall-Effect switch
designed for portable and battery powered equipment such
cellular phones, PDAs and portable PCs. Based on two Hall­Effect plates and a chopper stabilized architecture the AH180
provides a reliable solution over the whole operating ran ge.
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 24uW with a supply of 3V.

The single open-drain output switches on with either a north
or south pole of sufficient strength.

When the magnetic flux density (B) is larger than operate
point (Bop), output is switched on (Output pin is 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.

The AH180 is available in SIP-3L, SC59, DFN2020-3, and
DFN2020-6 packages.

Features

Pin Assignments

(Top View)

(SIP-3L)

GND 2.

(Top View)

5. GND

4. NC6. NC

(Top View)

SC59

3.

Output

1.Vdd

( Top View )

3.

Output
GND

2.
Vdd

1.

3. GND

• Omnipolar (north or south pole) operation

• Micropower operation

• Single open drain output

• 2.5V to 5.5V operating voltage

• 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) ＞ 5KV for DFN2020-6, DFN2020-3
＞ 6KV for SIP-3L and SC59

• SIP-3L, SC59 (commonly known as SOT23 in Asia)
DFN2020-6, DFN2020-3 packages

• Green Molding Compound (No Br, Sb) (Note 1)

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

1. Vdd 2. NC 3. Output

DFN2020-6

Applications

• Cover switch in clam-shell cellular phones

• Cover switch in Notebook PC/PDA

• Contact-less switch in consumer products

1. Vdd

DFN2020-3

3. Output

AH180

Document number: DS31023 Rev. 17 - 2

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Typical Application Circuit

AH180

MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR

SWITCH

2.5~5.5V

R

L

C

Note: C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF~100nF.

is the pull-up resistor, the recommended resistance is 10Kohm~100Kohm.

R

L

Pin Descriptions

Pin Name P/I/O Description

Vdd P/I Power Supply Input

GND P/I Ground

Output O Output Pin

NC NC No Connected

Functional Block Diagram

AH180

Output

Gnd

Vdd

Hall Plate

Hall Plate

AH180

Document number: DS31023 Rev. 17 - 2

Cancelling

Cancelling

Power

switch

Offset

Amp

Offset

Amp

Latch

Latch

Output

Logical

GND

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MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR

Absolute Maximum Ratings (T

Symbol Characteristics Values Unit

Vdd Supply voltage 7 V

B Magnetic flux density Unlimited

Ts Storage Temperature Range -65 to +150

PD

TJ

Package Power Dissipation
Maximum Junction Temperature 150

Recommended Operating Conditions

Symbol Parameter Conditions Min

Vdd Supply Voltage Operating 2.5 5.5 V

TA Operating Ambient Temperature Operating -40

= 25°C)

A

SIP-3L 550 mW
SC59-3L/ DFN2020-6/
DFN2020-3

230 mW

Max

85

AH180

SWITCH

°C

°C

Unit

°C

Electrical Characteristics (T

= 25 °C, Vdd = 3V; unless otherwise specified)

A

Symbol Characteristic Conditions Min Typ. Max Unit

Vout Output On Voltage Iout =1mA

Ioff Output Leakage Current Vout =5.5V, Output off

Idd(en)

Idd(en)
Idd(dis)
Idd(dis)

Idd(avg)

Idd(avg)

Supply Current

Chip enable, T
Chip enable, T

Vdd = 2.5~5.5V
Chip disable, T
Chip disable, T
Vdd = 2.5~5.5V
Average supply current,

= 25°C, Vdd = 3V

T

A

Average supply current,

= -40~85°C, Vdd = 2.5~5.5V

T

A

= 25°C, Vdd = 3V

A

= -40~85°C,

A

= 25°C, Vdd = 3V

A

= -40~85°C,

A

Tawake Awake Time (Note 2)

Tperiod Period (Note 2)

D.C. Duty Cycle

Notes: 2. When power is initially turned on, Vdd must be within its correct operating range (2.5V to 5.5V) to guarantee the output sampling.

The output state is valid after the second operating phase (typical 150ms).

Tperiod

⎯

⎯

⎯

⎯

⎯

⎯

⎯

⎯

⎯
⎯
⎯

0.1 0.3 V

<0.1

1 µA

3 6 mA
3 9 mA
5 10 µA
5 15 µA

8 16 µA

8 24 µA

75 125 µs
75 125 ms

0.1

⎯

%

Idd(en)

Idd (dis)

0

AH180

Document number: DS31023 Rev. 17 - 2

Tawake

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Sample and output
latched

© Diodes Incorporated

July 2010

AH180

MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR

SWITCH

Magnetic Characteristics (T

Option 1: (1mT=10 Gauss)

Symbol Parameter Min Typ. Max Unit

Bops(south pole to brand side)
Bopn(north pole to brand side) -60 -40 ­Brps(south pole to brand side)
Brpn(north pole to brand side) - -30 -10
Bhy(|Bopx|-|Brpx|) Hysteresis - 15 -

Option 2: (1mT=10 Gauss)

Symbol Parameter Min Typ. Max Unit

Bops(south pole to brand side)
Bopn(north pole to brand side) -60 -40 ­Brps(south pole to brand side)
Brpn(north pole to brand side) - -30 -20
Bhy(|Bopx|-|Brpx|) Hysteresis - 15 -

Notes: 3. Typical data is at TA = 25°C, Vdd = 3V, and for design information only.

4. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering.

= 25 °C, Vdd = 3V, Note 3, 4)

A

Operation Point

Release Point

Operation Point

Release Point

- 40 60

10 30 -

- 40 60

20 30 -

Gauss

Gauss

Operating Characteristics

( off-state )

Vcc

Turn on

Bhy

( Output Voltage )

( on-state )

Bopn Brpn 0

( Magnetic flux density B )

AH180

Document number: DS31023 Rev. 17 - 2

Output

Turn off

Vsat

( Output Voltage )

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Output

Turn off

( off-state )

Bhy

Vcc

Turn on

( on-state )

Vsat

Brps Bops0

( Magne tic flux d ensity B )

July 2010

© Diodes Incorporated