Diodes AH1895 User Manual
A
MEDIUM SENSITIVITY MICROPOWER
OMNIPLOAR HALL-EFFECT SWITCH
Description
The AH1895 is a medium sensitivity micropower Omnipolar Hall effect
switch IC with internal pull up and pull down capability. Designed for
portable and battery powered equipment such as cellular phones and
portable PCs to home appliances and industrial applications, the
average supply current is only 4.3uA at 1.85V. To support portable
equipment the AH1895 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 AH1895 is available in
small low profile X1-DFN1216-4 and SOT553 packages.
The 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) and held until B is lower than
release point (Brp). The output will remain off when there is no
magnetic field.
Features
NEW PRODUCT
Omnipolar Operation (North or South pole)
Supply Voltage of 1.6V to 3.6V
Medium Sensitivity
Micropower Operation
Chopper Stabilized Design Provides:
Superior Temperature Stability
Minimal Switch Point Drift
Enhanced Immunity to Physical Stress
No External Pull-up Resistors Required
Good RF Noise Immunity
-40°C to +85°C Operating Temperature
High ESD capability of 8kV (Human Body Model)
Small Low Profile X1-DFN1216-4 and SOT553 Packages
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)
X1-DFN1216-4
(Top View)
SOT553
Applications
Open and Close Detect for Cellular Phones
Holster or cover detect for cellular phones and Tablet PCs
Cover or Display Switches in Portable PCs
Digital Still, Video Cameras and Handheld Gaming Consoles
Door, Lids and Tray Position Switches
Level, Proximity and Position Switches
Contact-Less Switches in Home Appliances and Industrial
Applications
H1895
Typical Applications Circuit
Note: 4. C
is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical.
IN
AH1895
Document number: DS35742 Rev. 1 - 2
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Pin Descriptions
Package: X1-DFN1216-4
Pin Number Pin Name Function
1 OUTPUT Output Pin
2
3 NC No Connection (Note 5)
4 GND Ground Pin
Package: SOT553
Pin Number Pin Name Function
1
2 NC No Connection (Note 5)
3 NC No Connection (Note 5)
4 GND Ground
5 OUTPUT Output
Note: 5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
NEW PRODUCT
V
DD
V
DD
Power Supply Input
Power Supply Input
Functional Block Diagram
H1895
AH1895
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H1895
Absolute Maximum Ratings (Note 6) (@T
Symbol Parameter Rating Unit
VDD
V
DD_REV
I
OUTPUT
B Magnetic Flux Density Unlimited
PD
Ts Storage Temperature Range -65 to +150 °C
TJ
ESD HBM Human Body Model (HMB) ESD capability 8 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
operate the device at the absolute maximum rated conditions for any period of time.
Supply Voltage (Note 7) 6 V
Reverse Supply Voltage -0.3 V
Output Current (source and sink) 3.5 mA
Package Power Dissipation
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
DD
Recommended Operating Conditions (@T
Symbol Parameter Conditions Rating Unit
NEW PRODUCT
VDD
TA
Electrical Characteristics (@T
Symbol Parameter Conditions Min Typ Max Unit
VOL Output Lo w Voltage (on) I
VOH Output High Voltage (off) I
Ioff Output Leakage Current V
IDD(awake)
IDD(sleep)
IDD(avg)
Tawake Awake Time (Note 8) — 50 100 µs
Tperiod Period (Note 8)
D.C. Duty Cycle
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 Operating 1.6V to 3.6V V
Operating Temperature Range Operating -40 to +85 °C
= +25°C, VDD = 1.85V, unless otherwise specified.)
A
Supply Current
Average Supply Current
= +25°C, unless otherwise specified.)
A
X1-DFN1216-4 230 mW
SOT553 230 mW
= +25°C, unless otherwise specified.)
A
= 1mA — 0.1 0.2 V
OUT
= -1mA V
OUT
= 3.6V, Output off
OUT
During ‘awake’ period,
= +25°C, VDD = 3V
T
A
During ‘sleep’ period,
= +25°C, VDD = 3V
T
A
= +25°C, VDD = 1.85V
T
A
TA = +25°C, VDD = 3.6V
-0.2 V
DD
< 0.1
—
—
—
4.3 8 µA
—
—
—
—
-0.1 — V
DD
2.1
2.5
7.2 13 µA
50 100 ms
0.1 — %
—
—
1 µA
mA
mA
AH1895
Document number: DS35742 Rev. 1 - 2
3 of 10
www.diodes.com
July 2013
© Diodes Incorporated
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