AH1804
MICROPOWER OMNIPOLAR HALL EFFECT SENSORSWITCH
AH1804
Document number: DS35314 Rev. 2 - 2
1 of 9
www.diodes.com
September 2011
?Diodes Incorporated
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 12礎 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).
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癈 to 85癈 operating temperature
" Small low profile DFN1216-4 and SC59 packages
" ESD (HBM) 5KV
" Green Molding Compound
Pin Assignments
2
4
1
V
DD
NC
Output
GND
( Top View )
DFN1216-4
3
1 . V
DD
3.
GND 2.
Output
(Top View)
SC59
Applications
" Cover switch in clam-shell and slide cellular phones
" Cover switch in portable PCs, 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
AH1804
2.5V to 3.6V
Output
GND
Cin
Note: Cin is for power stabilization and to strengthen the noise immunity, C = 100nF or higher must be used.
V
DD
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