Diodes AH1812 User Manual
A
HIGH SENSIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Description
The AH1812 is a high sensitivity micropower Omnipolar Hall effect
switch IC with an open drain output. Designed for portable and battery
powered equipment such as cellular phones and portable PCs, the
average supply current is only 4.3µA at 1.85V. To support potable
equipment the AH1812 can operate over the supply range of 1.6V to
3.6V and uses a hibernating clocking system to minimize the power
consumption. To minimize PCB space the AH1812 is available in
small low profile X1-DFN1216-4 package
The open drain output is activated with either a North or South pole of
sufficient magnetic field strength. When the magnetic flux density (B)
perpendicular to the package is larger than operate point (Bop), the
output will be turned on (pulled low). The output is turned off when
B becomes lower than the release point (Brp). The output will remain
off when there is no magnetic field.
NEW PRODUCT
Features
H1812
Pin Assignments
(Top View)
X1-DFN1216-4
Applications
Omnipolar Operation (North or South Pole)
Supply Voltage of 1.6V to 3.6V
High Sensitivity
Micropower Operation
Chopper Stabilized Design Provides:
Superior Temperature Stability
Extremely Low Switch-Point Drift
Enhanced Immunity to Stress
Open Drain Output for System Flexibility
Good RF Noise Immunity
-40°C to +85°C Operating Temperature
Small and Low Profile X1-DFN1216-4 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.
Cover or Display Switch in Portable PCs
Open and Close Detect for Cellular Phones
Holster Detect for Cellular Phones and Tablet PCs
Digital Still and Video Cameras
Contact-Less Switches
Typical Applications Circuit (Note 4)
Note: 4. C
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF to 100nF.
IN
R
is the pull-up resistor, the recommended resistance is 10kΩ to 100kΩ.
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AH1812
Document number: DS36171 Rev. 2 - 2
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Pin Descriptions
Package: X1-DFN1216-4
Pin
Number
1
2 GND Ground Pin
3 NC No Connection (Note 5)
4 OUTPUT Output Pin
Pad Pad Can be connected to GND or left open circuit
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 Input
Function
Functional Block Diagram
NEW PRODUCT
H1812
Cancellation
Offset
AH1812
Document number: DS36171 Rev. 2 - 2
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© Diodes Incorporated
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H1812
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 +150 °C
TJ
ESD HBM 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.
NEW PRODUCT
Recommended Operating Conditions (@T
Symbol Characteristic Conditions Rating Unit
VDD
TA
Electrical Characteristics (@T
Symbol Characteristic Conditions Min Typ Max Unit
V
OUT
Ioff Output leakage current Vout=3.6V, B < Brps — <0.1 1 µA
IDD(awake)
IDD(sleep)
IDD(avg)
IDD(avg) VDD = 3.0V
Tawake Awake Active Pulse Width (Note 8) — 50 100 µs
Tperiod Awake Period (Note 8) — 50 100 ms
D.C. Duty Cycle — 0.1 — %
Note: 8. When power is initially turned on, the operating VDD (1.6V to 3.6V) must be applied to guaranteed the output sampling.
The output state is valid after the second operating cycle (typical 100ms).
Supply Voltage (Note 7) 6 V
Reverse Supply Voltage -0.3 V
Output current (source and sink) 2 mA
Package Power Dissipation X1-DFN1216-4 230 mW
Maximum Junction Temperature 150 °C
of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the
DD
Supply Voltage Operating 1.6 to 3.6 V
Operating Temperature Range Operating -40 to +85
= +25°C, VDD = 3V, unless otherwise specified.)
A
Output Low Voltage (on)
Supply Current
Average Supply Current
= +25°C, unless otherwise specified.)
A
= +25°C, unless otherwise specified.)
A
I
= 1mA
OUT
During ‘awake’ period — 2.3 — mA
During ‘sleep’ period — 2.5 — µA
VDD = 1.85V
— 0.1 0.2 V
— 4.3 8 µA
— 6 10 µA
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AH1812
Document number: DS36171 Rev. 2 - 2
3 of 8
www.diodes.com
August 2013
© Diodes Incorporated
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