Diodes AH1897 User Manual
A
HIGH SENSITIVITY MICROPOWER
OMNIPLOAR HALL-EFFECT SWITCH
Description
The AH1897 is a high sensitivity micropower Omnipolar Hall effect
switch IC with an internal pull up and pull down capability. 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 portable equipment the AH1897 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
AH1897 is available in a small low profile X1-DFN1216-4 package.
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). 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
Omnipolar Operation (North or South Pole)
Supply Voltage of 1.6V to 3.6V
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
Small 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.
Pin Assignments
(Top View)
X1-DFN1216-4
Applications
Cover or Display Switch in Portable PCs
Open and Close Detect for Cellular Phones
Holster or Cover Detect for Cellular Phones and Tablet PCs
Digital Still, Video Cameras and Handheld Gaming Consoles
Contact-Less Switches
H1897
Typical Applications Circuit
Note: 4. CIN is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 100nF typical.
AH1897
Document number: DS36470 Rev. 1 - 2
www.diodes.com
1 of 8
August 2013
© Diodes Incorporated
A
Pin Descriptions
Package: X1-DFN1216-4
Pin Number Pin Name Function
1
2 GND Ground Pin
3 NC No Connection (Note 5)
4 OUTPUT Output Pin
Note: 5. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
V
DD
Power Supply Input
Functional Block Diagram
NEW PRODUCT
H1897
AH1897
Document number: DS36470 Rev. 1 - 2
2 of 8
www.diodes.com
August 2013
© Diodes Incorporated
A
H1897
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.
NEW PRODUCT
Recommended Operating Conditions (@T
Symbol Parameter Conditions Rating Unit
VDD
TA
Electrical Characteristics (@T
Symbol Parameter Conditions Min Typ Max Unit
VOL
VOH
Ioff Output Leakage Current
IDD(awake)
IDD(sleep)
IDD(avg)
Tawake Awake Time (Note 8) — 50 100 µs
Tperiod 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) 3 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
DD
Supply Voltage Operating 1.6V to 3.6V V
Operating Temperature Range Operating -40 to +85
= +25°C, VDD = 3.0V, unless otherwise specified.)
A
Output Low Voltage (on)
Output High Voltage (off)
Supply Current
Average Supply Current
= +25°C, unless otherwise specified.)
A
= +25°C, unless otherwise specified.)
A
I
= 1mA
OUT
I
= -1mA V
OUT
= 3.6V, Output off
V
OUT
During ‘awake’ period, —
During ‘sleep’ period, —
T
= +25°C, VDD = 1.8V
A
TA = +25°C, VDD = 3.6V
— 0.1 0.2 V
DD
—
—
—
-0.2 V
DD
-0.1
< 0.1 1 µA
2.1 — mA
2.5 — mA
4.3 8 µA
7.2 13 µA
C
— V
AH1897
Document number: DS36470 Rev. 1 - 2
3 of 8
www.diodes.com
August 2013
© Diodes Incorporated
Loading...