Diodes AH1889 - Manual

AH1889
Document number: DS36256 Rev. 1 - 2
1 of 7
www.diodes.com
April 2013
© Diodes Incorporated
NEW PROD
UC
T
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
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
 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)
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
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.
Typical Applications Circuit
Note:
4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance 100nF typical.