AH1889
HIGH SENSIVITY DUAL UNIPOLAR HALL-EFFECT SWITCH
Description
AH1889 is a high sensitivity dual output Unipolar Hall effect IC which
can detect either a North or South pole independently and switch one
of its two outputs with internal pull up and pull down capability. The
AH1889 is mainly designed for low voltage applications which require
a quick response time and can operate over the supply voltage of
1.65V to 3.6V. To minimize PCB space AH1889 outputs have internal
pull up and pull down capability and is packaged in a small low profile
SOT553 package.
A South pole of sufficient strength will turn OUTPUT1 on and a North
Pin Assignments
(Top View)
NEW PRODUCT
pole of sufficient strength with turn on OUTPUT2. While the magnetic
flux density (B) perpendicular to the package is larger than operate
point Bops or Bopn, the appropriate output will be turned on (pulled
low), the output is held until B is lower than release point Brps or
Brps, then turned off (high). The outputs will be turned off and will
remain off when there is no magnetic field.
SOT553
Features
Two Monolithic Unipolar Hall Effect Sensor Switch
Operation with a South Pole (OUTPUT1)
Operation with a North Pole (OUTPUT2)
Applications
Position and proximity detection for consumer, office equipments
and industrial applications
Open and close detect switches for home appliances
Door, lids, tray position detect switches
Magnetic field direction detection
Contact-less switches for consumer and industrial applications
Supply Voltage of 1.65V to 3.6V
Quick Response Time Without Sleep Mode
Chopper Stabilized Design Provides:
Superior Temperature Stability
Extremely low Switch-Point Drift
Enhanced immunity to physical stress
Good RF Noise Immunity
-40°C to +85°C Operating Temperature
ESD (Human Body Model) >4kV
Small and Low Profile SOT553 package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Notes:
Typical Applications Circuit
Note:
4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance 100nF typical.
AH1889
Document number: DS36256 Rev. 1 - 2
1 of 7
www.diodes.com
April 2013
© Diodes Incorporated
AH1889
Pin Descriptions
Package: SOT553
Pin
Number
1
2
3
4
5
Note:
Pin
Name
OUTPUT2
GND
NC
V
DD
OUTPUT1
Function
North Pole Setecting Output Pin (active low)
Ground
No Connection (Note 5)
Power Supply Voltage
South Pole Detecting Output Pin (active low)
5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
NEW PRODUCT
Functional Block Diagram
Absolute Maximum Ratings
(Note 6) (@T
A
= +25°C, unless otherwise specified.)
Symbol
V
DD
V
DD_REV
I
OUTPUT
B
P
D
Ts
T
J
ESD
Notes:
Supply Voltage (Note 7)
Reverse Supply Voltage
Output current (source and sink)
Magnetic Flux Density
Package Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Human Body Model ESD capability
SOT553
6. Stresses greater than the 'Absolute Maximum Ratings' specified above may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
7. The absolute maximum V
DD
of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the
device at the absolute maximum rated conditions for any period of time.
Offset
Cancelling
Offset
Cancelling
Characteristics
Values
5
-0.3
1
Unlimited
230
-65 to +150
150
4
mW
C
C
kV
Unit
V
V
mA
2 of 7
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AH1889
Document number: DS36256 Rev. 1 - 2
April 2013
© Diodes Incorporated
AH1889
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Symbol
V
DD
T
A
Supply Voltage
Operating Temperature Range
Characteristic
Operating
Operating
Conditions
Rating
1.65 to 3.6
-40 to +85
Unit
V
°C
Electrical Characteristics
Symbol
(Note 8) (@T
A
= +25°C, V
DD
= 1.8V, unless otherwise specified.)
Conditions
I
OUT
= -0.5mA
I
OUT
= 0.5mA
V
DD
= 1.8V Outputs Off
V
DD
= 3.6V Outputs Off
Min
V
DD
-0.2
—
—
—
Typ
—
0.1
2.1
5
Max
—
0.2
—
—
Unit
V
V
mA
mA
Characteristic
OUTPUT1 and OUTPUT2 High Voltage (off)
OUTPUT1 and OUTPUT2 Low Voltage (on)
Supply Current
NEW PRODUCT
V
OH
V
OL
I
DD
Note:
8. When power is initially turned on, the operating V
DD
(1.65V to 3.6V) must be applied to guaranteed the output.
Magnetic Characteristics
(Note 9, 10, 11) (@T
A
= +25°C, V
DD
= 1.8V, unless otherwise specified.)
(1mT=10 Gauss)
Output
OUTPUT1
Symbol
Bops (South pole to part marking side)
Characteristic
Operation Point
Release point
Operation Point
Release point
Hysteresis
Min
—
6
-50
—
—
Typ
35
20
-35
-20
8
Max
50
—
—
-6
—
Unit
Brps (South pole to part marking side)
Bopn (North pole to part marking side)
OUTPUT2
Brpn (North pole to part marking side)
Bhy (|Bopx|-|Brpx|)
Notes:
Gauss
9. Typical data is at T
A
= +25°C, V
DD
= 3V, and for design information only.
10. Bops and Brps for OUTPUT1 pin responds to South pole only; Bopn and Brpn for OUTPUT2 pin responds to North pole only.
11. Magnetic characteristics may vary with operating temperature and after soldering.
( Output Voltage )
AH1889
Document number: DS36256 Rev. 1 - 2
3 of 7
www.diodes.com
( Output Voltage )
April 2013
© Diodes Incorporated
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