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AH1804

MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH



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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
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.
Pin Assignments
( Top View )
GND
4
NC
3
12
VDD Output
DFN1216-4
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.
(Top View)
GND 2.
SC59
3. Output
1 . VDD
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
VDD
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
1 of 9
www.diodes.com
September 2011
© Diodes Incorporated
Free Datasheet http://www.Datasheet4U.com



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AH1804 pdf
AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Pin Descriptions
Pin Name
P/I/O
Description
VDD
GND
P/I Power Supply Input
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.
Functional Block Diagram
VDD
Hall
Plate
Hall
Plate
Amp
Amp
Sleep/Awake Logic
and Power Switch
Latch
Latch
Output
Driver
Controller
Output
GND
AH1804
Document number: DS35314 Rev. 2 - 2
2 of 9
www.diodes.com
September 2011
© Diodes Incorporated
Free Datasheet http://www.Datasheet4U.com



Part Number AH1804
Description MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
Maker Diodes - Diodes
Total Page 9 Pages
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