Diodes AH1889 User Manual
A
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
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.
Features
Two Monolithic Unipolar Hall Effect Sensor Switch
NEW PRODUCT
Operation with a South Pole (OUTPUT1)
Operation with a North Pole (OUTPUT2)
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)
Notes: 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.
Pin Assignments
(Top View)
SOT553
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
H1889
Typical Applications Circuit
Note: 4. C
is for power stabilization and to strengthen the noise immunity, the recommended capacitance 100nF typical.
IN
AH1889
Document number: DS36256 Rev. 1 - 2
1 of 7
www.diodes.com
April 2013
© Diodes Incorporated
A
Pin Descriptions
Package: SOT553
Pin
Number
1 OUTPUT2 North Pole Setecting Output Pin (active low)
2 GND Ground
3 NC No Connection (Note 5)
4
5 OUTPUT1 South Pole Detecting Output Pin (active low)
Note: 5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
Pin
Name
V
DD
Power Supply Voltage
Function
Functional Block Diagram
H1889
NEW PRODUCT
Absolute Maximum Ratings (Note 6) (@T
Symbol Characteristics Values Unit
VDD
V
DD_REV
I
OUTPUT
B Magnetic Flux Density Unlimited
PD
Ts Storage Temperature Range -65 to +150
TJ
ESD Human Body Model ESD capability 4 kV
Notes: 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
device at the absolute maximum rated conditions for any period of time.
AH1889
Document number: DS36256 Rev. 1 - 2
Supply Voltage (Note 7) 5 V
Reverse Supply Voltage -0.3 V
Output current (source and sink) 1 mA
Package Power Dissipation SOT553 230 mW
Maximum Junction Temperature 150
Cancelling
Offset
Cancelling
Offset
= +25°C, unless otherwise specified.)
A
of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the
DD
2 of 7
www.diodes.com
C
C
April 2013
© Diodes Incorporated
A
Recommended Operating Conditions (@T
Symbol Characteristic Conditions Rating Unit
VDD
TA
Electrical Characteristics (Note 8) (@T
Symbol Characteristic Conditions Min Typ Max Unit
VOH
VOL
IDD
Note: 8. When power is initially turned on, the operating VDD (1.65V to 3.6V) must be applied to guaranteed the output.
Supply Voltage Operating 1.65 to 3.6 V
Operating Temperature Range Operating -40 to +85 °C
= +25°C, VDD = 1.8V, unless otherwise specified.)
A
OUTPUT1 and OUTPUT2 High Voltage (off)
OUTPUT1 and OUTPUT2 Low Voltage (on)
Supply Current
Magnetic Characteristics (Note 9, 10, 11) (@T
= +25°C, unless otherwise specified.)
A
I
= -0.5mA V
OUT
I
= 0.5mA
OUT
= 1.8V Outputs Off
V
DD
VDD = 3.6V Outputs Off
= +25°C, VDD = 1.8V, unless otherwise specified.)
A
NEW PRODUCT
Output Symbol Characteristic Min Typ Max Unit
OUTPUT1
OUTPUT2
Notes: 9. Typical data is at TA = +25°C, VDD = 3V, and for design information only.
Bops (South pole to part marking side) Operation Point — 35 50
Brps (South pole to part marking side) Release point 6 20 —
Bopn (North pole to part marking side) Operation Point -50 -35 —
Brpn (North pole to part marking side) Release point — -20 -6
Bhy (|Bopx|-|Brpx|) Hysteresis — 8 —
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.
H1889
-0.2
DD
— 0.1 0.2 V
— 2.1 — mA
— 5 — mA
— — V
(1mT=10 Gauss)
Gauss
( Output Voltage )
AH1889
Document number: DS36256 Rev. 1 - 2
( Output Voltage )
3 of 7
www.diodes.com
© Diodes Incorporated
April 2013
Loading...