AH1389
Document number: DS39033 Rev. 2 - 2
1 of 9
www.diodes.com
June 2017
© Diodes Incorporated
AH1389
NEW PROD UCT
ULTRA SENSITIVE DUAL OUTPUT
UNIPOLAR HALL EFFECT SWITCH
Description
The AH1389 is a miniature micropower magnetic Unipolar Hall effect
switch IC with dual outputs specifically designed for portable and battery
powered consumer equipment to home appliances and industrial
applications. To support battery powered equipment and low voltage
microcontrollers, the AH1389 can operate over the supply range of 1.6V
to 3.6V and uses a sleep function to give an average supply current of
only 4μA at 1.85V. The AH1389 has an 8kV ESD rating on the supply
and output pins. To minimize PCB space the AH1389 is packaged in
small low profile X2-DFN1410-4.
A North pole of sufficient strength will turn Output1 on and a South pole
of sufficient strength will turn on Output2. The Output1 is turned on
(pulled low) when the magnetic flux density (B), perpendicular to the
part marking surface, falls below North field operate point B
OPN
(-25G
typical). The Output1 is held low until B rises above the North field
release point B
RPN
(-20G typical).Similarly, the Output2 will operate
(pulled low) when B to the part marking surface rises above South field
operate point B
OPS
(25G typical) and is held low until B falls below the
South field release point B
RPS
(20G typical).
Features
Two Monolithic Unipolar Hall Switches
Operation with a North Pole (Output1) to Part Marking Surface
Operation with a South Pole (Output2) to Part Marking Surface
Supply Voltage of 1.6V to 3.6V
Micropower Operation
Dual Outputs for Independent Pole Detection for Design Flexibility
Internal Pull up and Pull Down Capability
Chopper Stabilized Design
Superior Temperature Stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
Good RF Noise Immunity
Operating Temperature Range -40C to +85C
8kV ESD on Supply and Output Pins
Small Low Profile X2-DFN1410-4
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
3
1
2
V
DD
Output1(N-Pole)
GND
4
Output2(S-Pole)
X2-DFN1410-4
Applications
Smart Cover or Dock Detect for Cellular Phones and Tablet
Position Detect for Digital Still, Video Cameras and Handheld
Gaming Consoles
Door, Lids and Tray Position Detect Switches Home Appliances
and Industrial Applications
Level, Proximity and Position Switches
Contact-Less Switches in Home Appliances 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.
AH1389
Document number: DS39033 Rev. 2 - 2
2 of 9
www.diodes.com
June 2017
© Diodes Incorporated
AH1389
NEW PROD UC T
Typical Applications Circuit
AH1389
GND
Output2
(S-Pole)
Output1
(N-Pole)
V
DD
C
IN
Note: 4. C
IN
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical and should be placed as close to
the supply pin as possible.
Pin Descriptions
Package: X2-DFN1410-4
Pin Number
Pin Name
Function
1
V
DD
Power Supply Input
2
GND
Ground Pin
3
Output2
Output Pin(South-Pole)
4
Output1
Output Pin(North-Pole)
Pad
Pad
The center exposed pad should be tied to the GND or floating – No connection internally.
Functional Block Diagram
Latch
and
Output
Driver
Controller
Sleep/Awake Logic
and Power Switch
V
DD
Hall
Plate
Amp
Offset
Cancellation
Output2
(S-Pole)
GND
Output1
(N-Pole)
GND
V
DD
1
2
3
4