AH1903

AH1903
HIGH SENSITIVITY MICROPOWER
UNIPOLAR/OMNIPOLAR SELECTABLE HALL-EFFECT SWITCH
Description
Pin Assignments
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
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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).
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
Typical Application Circuit
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)
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
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AH1903
Pin Descriptions
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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
Absolute Maximum Ratings (Note 5) (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Rating
Unit
VDD
Supply Voltage (Note 6)
6
V
VDD_REV
Reverse Supply Voltage
-0.3
V
IOUTPUT
Output current (source and sink)
B
PD
Package Power Dissipation
Ts
Storage Temperature Range
TJ
Maximum Junction Temperature
ESD HBM
Notes:
3
Magnetic Flux Density
Human Body Model (HMB) ESD capability
mA
Unlimited
X1-DFN1216-4
230
mW
-65 to +150
°C
150
°C
VDD, GND and OUTPUT pins
8
kV
Logic SEL pin
6
kV
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
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AH1903
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Conditions
Rating
Unit
Supply Voltage
Operating
1.6V to 3.6V
V
Operating Temperature Range
Operating
-40 to +85
°C
Electrical Characteristics (@TA = +25°C, VDD = 1.8V, unless otherwise specified.)
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Symbol
Min
Typ
Max
VOL
Output Low Voltage (on)
IOUT = 1mA
—
0.1
0.2
V
VOH
Output High Voltage (off)
IOUT = -1mA
VDD -0.2
VDD -0.1
—
V
0
1.4
—
—
0.5
3.6
V
V
SEL Low
SEL High
RU SEL
Ioff
Parameter
Omnipolar operation selected
Unipolar operation selected
BSEL pin internal pull-up resistor
Output Leakage Current
IDD(awake)
Supply Current
IDD(sleep)
IDD(avg)
Average Supply Current
Tawake
Tperiod
D.C.
Awake Time
Period
Duty Cycle
Notes:
Conditions
Unit
(Note 7)
—
50
VOUT = 3.6V, Output off
—
< 0.1
1
kΩ
µA
During ‘awake’ period,
TA = +25°C, VDD = 3V
—
2.1
—
mA
During ‘sleep’ period,
TA = +25°C, VDD = 3V
—
2.5
—
µA
TA = +25°C, VDD = 1.8V
—
4.3
8
µA
TA = +25°C, VDD = 3.6V
—
7.2
13
µA
(Note 8)
(Note 8)
—
—
—
50
50
0.1
100
100
—
µs
ms
%
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).
Electrical Characteristics (cont.)
AH1903
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AH1903
Magnetic Characteristics (Notes 9 &10) (TA = +25°C, VDD = 1.8V, unless otherwise specified)
Unipolar Operation: SEL = High ( > 1.4V to VDD or No connection)
Symbol
Test Condition
Bops (south pole to part marking side)
Operation Point
VDD = 1.6V to 3.6V
TA = -40°C to +85°C
Brps (south pole to part marking side)
Release Point
VDD = 1.6V to 3.6V
TA = -40°C to +85°C
Bhy (|Bopx|-|Brpx|)
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Characteristics
(1mT=10 Gauss)
Hysteresis
Min
Typ
Max
23
33
47
21
33
48
12
23
35
9
23
38
—
10
—
Unit
Gauss
Omnipolar Operation: SEL = Low (GND or <0.5V)
(1mT=10 Gauss)
Symbol
Characteristics
Test Condition
Bops (south pole to part marking side)
Operation Point
VDD = 1.6V to 3.6V
TA = -40°C to +85°C
Bopn (north pole to part marking side)
VDD = 1.6V to 3.6V
TA = -40°C to +85°C
Brps (south pole to part marking side)
VDD = 1.6V to 3.6V
TA = -40°C to +85°C
Release Point
Brpn (north pole to part marking side)
Bhy (|Bopx|-|Brpx|)
Notes:
VDD = 1.6V to 3.6V
TA = -40°C to +85°C
Hysteresis
Min
23
Typ
33
Max
47
21
33
48
-47
-33
-23
-48
-33
-21
12
23
35
9
23
38
-35
-23
-12
-38
-23
-9
—
10
—
Unit
Gauss
9. Typical data is at TA = +25°C, VDD = 1.8V.
10. Maximum and minimum parameters values over operating temperature range are not tested in production, they are guaranteed by design,
characterization and process control. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
AH1903
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AH1903
Application Notes
The AH1903 includes a Hall switch function select pin (SEL) so that the AH1903 can be changed between an Unipolar or an Omnipolar Hall
Switch operation to fit a multitude of applications. The diagrams below show the different switching functions between the Unipolar and the
Omnipolar Hall switch types.
AH1903 in Unipolar Operation
In Unipolar mode, the sensor detects the magnetic flux density perpendicular to the part marking surface with magnetic field direction only from
the back to the front of the package as shown below. This magnetic field direction is similar to having a South pole on the part marking side or a
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North pole to the back of the package.
Magnetic Field Direction for Unipolar Mode Operation
AH1903 in Omnipolar Operation
In Omnipolar mode, the sensor detects the magnetic flux density perpendicular to the part marking surface with magnetic field directions from the
front to the back as well as from the back to the front of the package as shown below. The sensor detects both North or South pole to the part
marking side or to the back of the package.
Magnetic Field Directions for Omnipolar Mode Operation
The AH1903 includes a function select pin (SEL) to change the device type between Unipolar and Omnipolar operations. The SEL pin can be
hard wired within the application circuit or can be changed on the fly by using the SEL pin as a logic input. This feature allows the AH1903
operating mode to be changed by firmware within the application without the addition of any external components. If the SEL pin is left open
circuit the AH1903 defaults to Unipolar mode.
AH1903
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AH1903
Application Notes (cont.)
Applications Circuit 1 – Unipolar Operation
Connecting the SEL pin to VDD, a voltage greater than 1.4V or leaving the SEL pin unconnected configures the AH1903 into Unipolar mode, only
detecting South pole of sufficient strength from the part mark side of the package. In Unipoalr mode, North pole fields will not switch on the
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output.
Applications Circuit 2 – Omnipolar Operation
Connecting the SEL pin to ground configures the AH1903 into Omnipolar mode, detecting both North and South magnetic fields of sufficient
strength.
Applications Circuit 3 – Adjustable Sensor Type
To enhance flexibility within the application the sensor operation modes can be selected with a standard logic signal allowing it to be controlled
by a micro-controller or a logic source. This allows the sensor type to be changed within the application without a hardware change. Whenever
the Hall switch type is changed, the selection changeover should allow two awake period for the output to be valid.
Sensor Type Change Timing and Valid Output
Whenever type selection SEL pin input is changed, allow for band selection changeover to complete and stabilize. The output is valid only after
the second complete operating ‘awake’ phase. Time taken for the output to be valid, after the SEL change, depends on timing of SEL change
during the sleep and awake phase; this time can range from 100ms typical and 200.1ms maximum.
AH1903
Document number: DS36568 Rev. 3 - 2
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AH1903
Typical Operating Characteristics
Operating Switch Points in Unipolar Operation (SEL = No connection or SEL = VDD)
60
60
VDD = 1.6V, SEL = High (VDD or No connection)
40
Bops
30
Brps
20
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40
Bops
30
Brps
20
Bhys
10
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
Temperature (°C)
Temperature (°C)
Switch Points vs Temperature
Switch Points vs Temperature
60
VDD = 3.6V, SEL = High (VDD or No Connection)
50
100
TA = +25 °C, SEL = High (V DD or No connection)
50
40
Gauss (G)
Gauss (G)
Bhys
10
0
60
VDD = 1.8V, SEL = High (V DD or No connection)
50
Gauss (G)
Gauss (G)
50
Bops
30
Brps
20
Bhys
10
40
Bops
30
-25
0
25
50
75
Bhy
10
0
-50
Brps
20
100
0
1.5
1.8
2.1
2.4
2.7
3
3.3
Temperature (°C)
Temperature (°C)
Switch Points vs Temperature
Switch Points vs Temperature
AH1903
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3.9
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AH1903
Typical Operating Characteristics (cont.)
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
VDD = 1.6V, SEL = Low (GND)
Bhy
Brpn
Bopn
Gauss (G)
-50
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
-25
0
25
50
75
Gauss (G)
Bops
Brps
100
Bops
Brps
Bhy
Brpn
Bopn
-25
0
25
50
75
Temperature (°C)
Switch Points vs Temperature
Switch Points vs Temperature
Bops
Brps
Bhy
Brpn
Bopn
-25
VDD = 1.8V, SEL = Low (GND)
-50
VDD = 3.6V, SEL = Low (GND)
-50
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
Temperature (°C)
Gauss (G)
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Gauss (G)
Operating Switch Points in Omnipolar Operation (SEL = GND)
0
25
50
75
100
60
50
40
30
20
10
0
-10
-20
-30
-40
-50
-60
100
TA = +25 °C, SEL = Low (GND)
Bops
Brps
Bhy
Brpn
Bopn
1.5
1.8
2.1
2.4
2.7
3
3.3
Temperature (°C)
Temperature (°C)
Switch Points vs Temperature
Switch Points vs Temperature
3.6
3.9
3.6
3.9
10
9
8
3.6V
7
6
5
1.8V
1.6V
4
3
2
1
0
-50
-25
0
25
50
75
100
Average Supply Current IDD (μA)
Average Supply Current IDD (μA)
Average Supply Current - Unipolar or Omnipolar Operations
10
Temperature (°C)
Document number: DS36568 Rev. 3 - 2
TA = +25 °C
8
7
6
5
4
3
2
1
0
1.5
1.8
2.1
2.4
2.7
3
3.3
Supply Voltage (V)
Average Supply Current vs. Temperature
AH1903
9
Average Supply Current vs. Supply Voltage
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Ordering Information
Part Number
Package
Code
Packaging
AH1903-FA-7
FA
X1-DFN1216-4
Quantity
7” Tape and Reel
Part Number Suffix
3000/Tape & Reel
-7
Marking Information
(1)
Package Type: X1-DFN1216-4
Part Number
AH1903-FA-7
AH1903
Document number: DS36568 Rev. 3 - 2
Package
X1-DFN1216-4
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Identification Code
F3
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AH1903
Package Outline Dimensions (All dimensions in mm.)
Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for latest version.
Package Type: X1-DFN1216-4
A
(1)
3
A
1
A
e
n
a
l
P
g
n
i
t
a
e
S
︶
°
5
4
x
2
.
0
'
C
︵
D
I
1
#
n
i
P
E
2
E
NEW PRODUCT
De
X1-DFN1216-4
Dim Min Max Typ
A
0.47 0.53 0.50
A1
0.00 0.05 0.02
A3
--0.13
b
0.15 0.25 0.20
D
1.15 1.25 1.20
D2
0.75 0.95 0.85
E
1.55 1.65 1.60
E2
0.55 0.75 0.65
e
0.65
L
0.20 0.30 0.25
Z
0.175
All Dimensions in mm
L
2
D
b
Z
Bottom View
Sensor Location (To be confirmed)
Suggested Pad Layout
Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.
(1)
Package Type: X1-DFN1216-4
1
X C
1
Y
2
Y
Dimensions
Value
C
0.65
X
0.25
X1
0.90
Y
0.50
Y1
0.70
Y2
2.00
All Dimensions in mm
Y
X
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AH1903
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