AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Description
AH1887 is with two Hall effect plates and dual CMOS output
driver, mainly designed for battery–powered, hand-held
equipment (such as Cellular and Cordless Phone, PDA). The
total operation power is down to 15uW in the 1.8V supply.
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 operate
point
Bop(s),
the output1 will be turned on (low), the output is
held until
B
is lower than release point
Brp(s),
then turned off
(high).
While the magnetic flux density
(B)
is larger than operate
point
Bop(n),
the output2 will be turned on (low), the output is
held until
B
is lower than release point
Brp(n),
then turned off
(high).
Pin Assignments
( Top View )
Out 2
GND
NC
1
2
3
SOT553
5
Out 1
4
Vdd
Features
•
•
•
•
Micropower operation
Operation with North or South Pole
1.65V to 3.3V 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
＞
4KV in human body mode
Package: SOT553
“Green” Molding Compound
Applications
•
•
•
Cellular phone
PDA
Cordless phone
•
•
•
•
•
Typical Application Circuit
Vdd
Output 1
AH1887
Output 2
GND
AH1887
Document number: DS31313 Rev. 4 - 2
1 of 7
www.diodes.com
August 2010
© Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Pin Descriptions
Pin Name
Out 2
(Note 1)
GND
NC
Vdd
Out 1
(Note 1)
Notes:
P/I/O
O
P/I
P/I
O
Pin #
1
2
3
4
5
Description
Output Pin ( active Low )
Ground
No Connection
Power Supply Voltage
Output Pin ( active Low )
1. Output1 responds to South pole; Output2 responds to North pole.
Functional Block Diagram
Vdd
Power
switch
Offset
Cancelling
Offset
Cancelling
Hall Plate
Amp
Latch
Out1
Logical
Hall Plate
GND
Vdd
Amp
Latch
Out2
GND
Absolute Maximum Ratings
(T
A
= 25°C)
Symbol
Vdd
B
T
S
P
D
T
J
Characteristics
Supply voltage
Magnetic flux density
Storage Temperature Range
Package Power Dissipation
Maximum Junction Temperature
Values
5
Unlimited
-65 to +150
230
150
Unit
V
°C
mW
°C
Recommended Operating Conditions
(T
A
= 25°C)
Symbol
Vdd
T
A
AH1887
Document number: DS31313 Rev. 4 - 2
Parameter
Supply Voltage
Operating Temperature Range
Conditions
Operating
Operating
2 of 7
www.diodes.com
Rating
1.65 to 3.3
-40 to +85
Unit
V
°C
August 2010
© Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Electrical Characteristics
(T
A
= 25°C, Vdd = 1.8V, unless otherwise specified)
Symbol
V
OH
V
OL
Idd(en)
Idd(dis)
Idd(avg)
Tawake
Tperiod
D.C.
Characteristic
Output On Voltage (High side)
Output On Voltage (Low side)
Supply Current
Awake Time
Period
Duty Cycle
Conditions
I
O
= -0.5mA
I
O
= 0.5mA
Chip enable
Chip disable
average supply current
Min
Vdd-0.2
-
-
-
-
-
-
-
Typ.
-
-
2
5
7
50
50
0.1
Max
-
0.2
4
8
12
100
100
-
Unit
V
V
mA
uA
uA
µs
ms
%
Magnetic Characteristics
(T
A
= 25°C, Vdd = 1.8V~3.0V, Note 2, 3, 4)
(1mT=10 Gauss)
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
-
-50
6
-
3
Typ.
35
-35
20
-20
15
Max
50
-
-
-6
-
Unit
Gauss
2. Typical data is at Ta = 25°C, Vdd = 3V, and for design information only.
3. Bops & Brps for Output 1 responds to South pole; Bopn & Brpn for Output 2 responds to North pole.
4. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Output2
( Output Voltage )
( Output Voltage )
Output1
V
dd
( off-state )
Turn on
( off-state )
V
dd
B
hy
Turn off
Turn off
B
hy
Turn on
( on-state )
V
sat
S
N
V
sat
( on-state )
N
B
opn
B
rpn
0
( Magnetic flux density B )
0 B
rps
B
ops
( Magnetic flux density B )
S
AH1887
Document number: DS31313 Rev. 4 - 2
3 of 7
www.diodes.com
August 2010
© Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Typical Operating Characteristics
Switching Point
AH1887 Hysteresis vs. Temperature
(Vdd=1.8V)
40
30
20
10
AH1887 Hysteresis vs. Vdd @ (TA=25 Degree C)
40
30
Bops
BrpS
Bopn
-50
-25
0
25
50
75
100
20
10
Gauss(G)
0
1.8
2.3
2.8
3.3
Bops
Brps
Bopn
Brpn
Bhys_s
Bhys_n
Gauss(G)
0
-10
-20
-30
-40
Brpn
Bhys_s
Bhys_n
-10
-20
-30
-40
Temperature (
℃
)
Vdd(V)
Supply Current
AH1887 Idd(avg.) vs. Temperature
12
10
8
Idd(avg.)
unit: uA
AH1887 Idd(avg.) vs. Vdd (T
A
=25 Degree C)
14
12
10
1.8V
Idd(avg.)
unit: uA
8
6
4
6
4
2
0
-50
-25
0
25
50
75
100
2.5V
Idd(avg.) unit: uA
2
0
1.8
2.3
Vdd(V)
2.8
3.3
Temperature (
℃
)
AH1887
Document number: DS31313 Rev. 4 - 2
4 of 7
www.diodes.com
August 2010
© Diodes Incorporated
AH1887
MICROPOWER, ULTRA-SENSITIVE HALL EFFECT
SWITCH
Performance Characteristics
T
A
(°C)
P
D
(mW)
25
230
P
D
(m W )
300
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 o w e r D is s i p a tio n C u rv e
200
100
0
0
-4 0
25
50
75
85
100
12 5
150
o
T
A
( C)
Ordering Information
AH 1887 - Z G - 7
Package
Z : SOT553
Device
AH1887-ZG-7
Notes:
Green
Packing
7 : Tape & Reel
G : Green
Package
Code
Z
Packaging
(Note 5 & 6)
SOT553
7” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
5. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
6. 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.
AH1887
Document number: DS31313 Rev. 4 - 2
5 of 7
www.diodes.com
August 2010
© Diodes Incorporated
stm32/stm8
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