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 and 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
Pin Assignments
( Top View )
GND
4
NC
3
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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).
The AH1804 is available in SC59 and small low profile
DFN1216-4 packages.
1
2
V
DD
Output
DFN1216-4
(Top View)
3. Output
GND 2.
1 . V
DD
SC59
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
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
V
DD
2.5V to 3.6V
Cin
AH1804
Output
GND
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
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AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Pin Descriptions
Pin Name
V
DD
GND
Output
NC
Notes:
P/I/O
P/I
P/I
O
NC
Power Supply Input
Ground
Output Pin
Description
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No Connection (Note 1)
1. NC is “No Connection” which is not connected internally. This pin can be left open or tied to ground.
Functional Block Diagram
V
DD
Sleep/Awake Logic
and Power Switch
Hall
Plate
Offset
Cancellation
Amp
Latch
Output
Driver
Controller
Output
GND
Hall
Plate
Offset
Cancellation
Amp
Latch
AH1804
Document number: DS35314 Rev. 2 - 2
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AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Absolute Maximum Ratings
(T
A
= 25°C, Note 2)
Symbol
V
DD
V
DD rev
B
Ts
P
D
T
J
Notes:
Characteristics
Supply voltage (Note 3)
Reverse supply voltage
Magnetic flux density
Storage Temperature Range
Package Power Dissipation
Maximum Junction Temperature
DFN1216-4
SC59
Values
5.0
-0.3
Unlimited
-65 to +150
230
270
150
Unit
V
V
°C
mW
°C
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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.
Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time
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.
Recommended Operating Conditions
(T
A
= 25°C)
Symbol
V
DD
T
A
Notes:
Characteristics
Supply Voltage
Operating Temperature Range
Conditions
C
IN
=0.1µF (Note 4)
Operating
Rating
2.5 to 3.6
-40 to +85
Unit
V
°C
4. Decoupling capacitor C
IN
= 100nF or higher must be used for full 2.5V to 3.6V supply range
.
Electrical Characteristics
(T
A
= 25°C, V
DD
= 3.3V, unless otherwise specified)
Symbol
V
OL
V
OH
Idd(en)
Idd(dis)
Idd(avg)
Tawake
Tperiod
D.C.
Notes:
Characteristics
Output Low Voltage (on)
Output High Voltage (off)
Supply current
Awake Time
Period
Duty Cycle
I
OUT
= 1mA
I
OUT
= -1mA
Chip enable
Chip disable
Conditions
Min
⎯
V
DD
-0.2
⎯
⎯
⎯
⎯
⎯
⎯
Typ.
0.1
V
DD
-0.1
4
8
12
50
50
0.1
Max
0.2
⎯⎯
⎯
⎯
⎯
100
100
⎯
Unit
V
V
mA
µA
µA
µs
ms
%
Average supply current,
(Note 5)
(Note 5)
5. When power is initially on, the operating V
DD
(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).
AH1804
Document number: DS35314 Rev. 2 - 2
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September 2011
© Diodes Incorporated
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Magnetic Characteristics
(T
A
= 25°C, V
DD
= 3.3V, Note 6)
Symbol
Bops(south pole to brand side)
Bopn(north pole to brand side)
Brps(south pole to brand side)
Brpn(north pole to brand side)
Bhy (|Bopx|-|Brpx|)
Notes:
Characteristics
Operation Point
Release Point
Hysteresis
(1mT=10 Gauss)
Min
Typ.
20
-60
15
-
40
-40
32
-32
8
Max
60
-20
-
-15
-
Unit
Gauss
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6. The magnetic characteristics may vary with operating temperature and after soldering.
Output
( Output Voltage )
( Output Voltage )
Output
V
cc
( off-state )
B
hy
( off-state )
V
cc
Turn on
Turn off
Turn off
B
hy
Turn on
( on-state )
V
sat
V
sat
( on-state )
B
opn
B
rpn
0
( Magnetic flux density B )
0 B
rps
B
ops
( Magnetic flux density B )
AH1804
Document number: DS35314 Rev. 2 - 2
4 of 9
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September 2011
© Diodes Incorporated
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Typical Characteristics
Typical Switch Point Bop and Brp vs. Temperature
Typical Switch Points Bop and Brp vs. Supply Voltage
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Average Supply Current vs. Temperature
Average Supply Current vs. Supply Voltage
AH1804
Document number: DS35314 Rev. 2 - 2
5 of 9
www.diodes.com
September 2011
© Diodes Incorporated
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