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 Switch-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)
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.
•
•
•
•
•
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
Package
FT4 : DFN2015-6
FU4 : DFN3020-6
Green
G : Green
Packing
7 : Tape & Reel
Device
AH1822-FT4G-7
AH1822-FU4G-7
Notes:
Package
Code
FT4
FU4
Packaging
(Note 2)
DFN2015H4-6
DFN3020H4-6
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
3000/Tape & Reel
-7
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
www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
Pin Assignments
( Top View )
( Top View )
Output
1
2
3
6
5
4
Vdd
NC
GND
NC
Vdd
GND
1
2
3
6
5
4
NC
Output
GND
NC
GND
DFN2015-6
Notes:
3.
NC is “No Connection” which is recommended to be tied to ground.
DFN3020-6
Pin Descriptions
Pin Name
Vdd
GND
Output
NC
P/I/O
P/I
P/I
O
NC
Description
Power Supply Input
Ground
Output Pin
No Connected
Block Diagram
Vdd
Power
switch
Offset
Cancelling
Hall Plate
Amp
Latch
Output
Logical
GND
Offset
Cancelling
Hall Plate
Amp
Latch
AH1822 Rev. 5
2 of 9
www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
Typical Circuit
2.5~5.5V
R
L
C
AH1822
GND
Output
Notes:
4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF~100nF.
R
L
is the pull-up resistor, the recommended resistance is 10KΩ~100KΩ.
Absolute Maximum Ratings
Symbol
Vdd
B
T
ST
P
D
T
J
(at T
A
= 25°C)
Characteristics
Supply voltage
Magnetic flux density
Storage Temperature Range
Package Power Dissipation
Maximum Junction Temperature
Values
7
Unlimited
-65 to +150
230
150
Unit
V
°C
mW
°C
Recommended Operating Conditions
Symbol
Vdd
T
A
Parameter
Supply Voltage
Operating Temperature Range
Conditions
Operating
Operating
Rating
2.5~5.5
-40 to +85
Unit
V
°C
AH1822 Rev. 5
3 of 9
www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
Electrical Characteristics
Symbol
Characteristic
(T
A
= +25°C, Vdd = 3V; unless otherwise specified)
Conditions
Iout=1mA
Vout=5.5V, Output off
Chip enable , T
A
= 25°C , Vdd = 3V
Chip enable , T
A
= -40~85°C ,
Vdd = 2.5~5.5V
Chip disable , T
A
= 25°C , Vdd = 3V
Chip disable , T
A
= -40~85°C ,
Vdd = 2.5~5.5V
Average supply current ,
T
A
= 25°C , Vdd = 3V
Average supply current ,
T
A
= -40~85°C , Vdd = 2.5~5.5V
For design information only
(Note 5)
(Note 5)
Min
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
Typ.
0.1
<0.1
3
3
5
5
8
8
300
75
75
0.1
Max
0.3
1
6
10
10
18
16
28
⎯
150
150
⎯
Unit
V
µA
mA
mA
µA
µA
µA
µA
KHz
µs
ms
%
Vout
Output On Voltage
Ioff
Output Leakage Current
Idd(en)
Idd(en)
Idd(dis)
Idd(dis) Supply Current
Idd(avg)
Idd(avg)
F
C
Tawake
Tperiod
D.C.
Notes:
Chopping Frequency
Awake Time
Period
Duty Cycle
5. When power is initially on, the operating Vdd (2.5V to 5.5V) must be applied to be guaranteed for the output sampling. The output state is valid
after the second operating phase (typical 150ms).
Tperiod
Tawake
Idd(en)
Idd (dis)
0
Sample and output
latched
AH1822 Rev. 5
4 of 9
www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
AH1822
MICROPOWER OMNIPOLAR HALL-EFFECT SENSOR
SWITCH
Magnetic Characteristics
(T
A
=25°C, Vdd=3V, Note 6, 7)
(1mT=10 Gauss)
Max
Unit
55
-
-
-10
-
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:
Characteristic
Operate Point
Release Point
Hysteresis
Min
-
-55
10
-
5
Typ.
28
-28
20
-20
8
Gauss
6. Typical data is at Ta = 25°C, Vdd = 3V, and for design information only.
7. Operating point and release point will vary with supply voltage and operating temperature.
Output
( Output Voltage )
( Output Voltage )
Output
V
cc
( off-state )
Turn off
Turn on
( off-state )
V
cc
B
hy
Turn off
B
hy
Turn on
( on-state )
V
sat
B
opn
B
rpn
0
( Magnetic flux density B )
V
sat
( on-state )
0 B
rps
B
ops
( Magnetic flux density B )
Performance Characteristics
T
A
(°C)
P
D
(mW)
25
230
50
184
60
166
70
147
80
129
85
120
90
110
100
92
110
74
120
55
130
37
140
18
150
0
P
D
(m W )
300
P o w e r D is s ip a tio n C u rv e
200
100
0
0
25
50
75
85
100
125
150
T
A
(。 C )
AH1822 Rev. 5
5 of 9
www.diodes.com
FEBRUARY 2009
©
Diodes Incorporated
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
