Diodes AH1822 User Manual
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
Features
• Micropower operation
• Operation with magnetic field of either north or south
pole (omnipolar)
• 2.5V to 5.5V battery operation
• Chopper stabilized
• Superior temperature stability
• Extremely Low Switc h-Point Drift
• Insensitive to Physical Stress
• Good RF noise immunity
• -40°C to 85°C operating temperature
• ESD (HBM) ＞ 5KV
• DFN2015-6 and DFN3020-6: Available in “Green”
Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Cover switch in clam-shell cellular phones
• Cover switch in Notebook PC/PDA
• Contact-less switch in consumer products
Ordering Information
AH 1822 - XXX G - 7
General Description
AH1822 is comprised of two Hall effect plates and an open-drain
output driver, mainly designed for battery-operation, hand-held
equipment (such as Cellular and Cordless Phone, PDA). The
total power consumption in normal operation is typically 24μW
with a 3V power source.
Either north or south pole of sufficient strength will turn the output
on. The output will be turned off under no magnetic field. While
the magnetic flux density (B) is larger than operating point (Bop),
the output will be turned on (low), the output is held until B is
lower than release point (Brp), then turned off.
Package
FT4 : DFN2015-6
FU4 : DFN3020-6
G : Green
PackingGreen
7 : Tape & Reel
Device
Package
Code
Packaging
(Note 2)
Quantity Part Number Suffix
7” Tape and Reel
AH1822-FT4G-7 FT4 DFN2015H4-6 3000/Tape & Reel -7
AH1822-FU4G-7 FU4 DFN3020H4-6 3000/Tape & Reel -7
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
.
AH1822 Rev. 5 1 of 9 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Pin Assignments
( Top View )
1
NC
Vdd
GND
2
3
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
( Top View )
6
5
4
NC
Output
GND
Output
NC
GND
1
2
3
6
Vdd
5
NC
4
GND
DFN2015-6
Notes: 3. NC is “No Connection” which is recommended to be tied to ground.
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
Block Diagram
Vdd
Power
switch
Latch
Hall Plate
Cancelling
Offset
Amp
DFN3020-6
Output
Logical
Hall Plate
AH1822 Rev. 5 2 of 9 FEBRUARY 2009
Cancelling
Offset
Amp
www.diodes.com © Diodes Incorporated
Latch
GND
Typical Circuit
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
2.5~5.5V
R
L
C
AH1822
GND
Notes: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF~100nF.
R
is the pull-up resistor, the recommended resistance is 10KΩ~100KΩ.
L
Output
Absolute Maximum Ratings (at TA= 25°C)
Symbol Characteristics Values Unit
Vdd Supply voltage 7 V
B Magnetic flux density Unlimited
TST Storage Temperature Range -65 to +150
PD Package Power Dissipation 230 mW
TJ
Maximum Junction Temperature 150
Recommended Operating Conditions
Symbol Parameter Conditions Rating Unit
Vdd Supply Voltage Operating 2.5~5.5 V
TA Operating Temperature Range Operating -40 to +85
°C
°C
°C
AH1822 Rev. 5 3 of 9 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
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