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Diodes Semiconductor Electronic Components Datasheet

AH1903 Datasheet

HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH

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AH1903 pdf
AH1903
HIGH SENSITIVITY MICROPOWER
UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH
Description
The AH1903 is a high sensitivity micropower Omnipolar or Unipolar
selectable Hall effect switch IC with internal pull up and pull down
capability. Designed for battery powered consumer equipment such
as cellular phones and portable PCs to office equipment, home
appliances and industrial applications, the average supply current is
only 4.3µA at 1.8V. To support portable equipment the AH1903 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 AH1903 is available in a small low profile
X1-DFN1216-4 package.
The user can change the Hall switch function between Unipolar and
Omnipolar operation via the Select (SEL) pin. If the SEL pin is open
circuit or pulled high the AH1903 operates in Unipolar switch mode
detecting magnetic field direction with a South pole to the part mark
side of the package. If the SEL pin is pulled low the AH1903 functions
as a Omnipolar switch detecting either a North or South pole. The
output is activated with a 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).
Pin Assignments
Applications
Open and Close Detect for flip/slide Cellular Phones
Smart Cover or Dock Detect for Cellular Phones and Tablet PCs
Cover or Display Switch in Portable PCs (eg Ultrabook)
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
Features
Unipolar or Omnipolar Operation
ƒ Operation can be changed by a logic source or fixed via
PCB design with no additional components
Supply Voltage of 1.6V to 3.6V
High Sensitivity
Micropower Operation
Chopper Stabilized Design Provides
ƒ Superior Temperature Stability
ƒ Minimal Switch Point Drift
ƒ 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) on VDD, GND
and OUTPUT Pins
Small Low Profile X1-DFN1216-4 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Typical Application Circuit
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.
4. CIN 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.
AH1903
Document number: DS36568 Rev. 3 - 2
1 of 11
www.diodes.com
June 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH1903 Datasheet

HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH

No Preview Available !

AH1903 pdf
Pin Descriptions
Package: X1-DFN1216-4
Pin Number
1
2
Pin Name
OUTPUT
GND
3 SEL
4 VDD
Pad Pad
Function
Output Pin
Ground Pin
Unipolar or Omnipolar Operation Select Pin;
For Unipolar operation, pull-up the SEL pin to VDD or leave it unconnected.
The SEL pin is internally pulled high.
For Omnipolar operation, connect the SEL pin to GND.
Power Supply Input
The center exposed pad - It is internally connected to VDD pin and should
not be connected to GND or any other signal on the PCB. The exposed pad
should be left open (unconnected) on the PCB layout.
Functional Block Diagram
AH1903
Absolute Maximum Ratings (Note 5) (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
VDD_REV
IOUTPUT
B
PD
Ts
TJ
ESD HBM
Supply Voltage (Note 6)
Reverse Supply Voltage
Output current (source and sink)
Magnetic Flux Density
Package Power Dissipation
Storage Temperature Range
Maximum Junction Temperature
Parameter
Human Body Model (HMB) ESD capability
X1-DFN1216-4
VDD, GND and OUTPUT pins
Logic SEL pin
Rating
6
-0.3
3
Unlimited
230
-65 to +150
150
8
6
Unit
V
V
mA
mW
°C
°C
kV
kV
Notes:
5. 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.
6. The absolute maximum VDD of 6V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to
operate the device at the absolute maximum rated conditions for any period of time.
AH1903
Document number: DS36568 Rev. 3 - 2
2 of 11
www.diodes.com
June 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH1903 Datasheet

HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH

No Preview Available !

AH1903 pdf
AH1903
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Supply Voltage
Operating Temperature Range
Operating
Operating
Conditions
Rating
1.6V to 3.6V
-40 to +85
Unit
V
°C
Electrical Characteristics (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
Symbol
VOL
VOH
SEL Low
SEL High
RU SEL
Ioff
IDD(awake)
IDD(sleep)
Parameter
Output Low Voltage (on)
Output High Voltage (off)
Omnipolar operation selected
Unipolar operation selected
BSEL pin internal pull-up resistor
Output Leakage Current
Supply Current
IDD(avg)
Tawake
Tperiod
D.C.
Average Supply Current
Awake Time
Period
Duty Cycle
IOUT = 1mA
IOUT = -1mA
Conditions
(Note 7)
VOUT = 3.6V, Output off
During ‘awake’ period,
TA = +25°C, VDD = 3V
During ‘sleep’ period,
TA = +25°C, VDD = 3V
TA = +25°C, VDD = 1.8V
TA = +25°C, VDD = 3.6V
(Note 8)
(Note 8)
Min
VDD -0.2
0
1.4
Notes:
7. SEL pin internal pull-up resistor is only active during AWAKE time.
8. When power is initially on, the operating VDD (1.6V to 3.6V) must be applied to guarantee the output sampling.
The output state is valid after the second operating phase (typical 100ms).
Typ
0.1
VDD -0.1
50
< 0.1
2.1
2.5
4.3
7.2
50
50
0.1
Max
0.2
0.5
3.6
1
8
13
100
100
Unit
V
V
V
V
k
µA
mA
µA
µA
µA
µs
ms
%
Electrical Characteristics (cont.)
AH1903
Document number: DS36568 Rev. 3 - 2
3 of 11
www.diodes.com
June 2014
© Diodes Incorporated




Part Number AH1903
Description HIGH SENSITIVITY MICROPOWER UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH
Maker Diodes
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