A1103
Unipolar Hall-Effect Digital Switch
Features and Benefits
–
–
–
–
–
–
–
–
–
4.5V to 24V Operation
-40℃ to 150℃ Superior temperature operation
Bipolar technology
Open-collector 25 mA output
Reverse battery protection
Small Size-SOT23 3L or SIP 3L
Solid-state reliability
Resistant to physical stress
Activate with small, commercially available
Permanent magnets
Application Examples
Automotive, Consumer and Industrial
Solid-state switch
Brushless DC motor commutation
Speed detection
Linear position detection
Angular position detection
Proximity detection
3 pin SOT23 (suffix SO)
3 pin SIP (suffix UA)
Functional Block Diagram
VDD
Voltage
Regulatr
OUT
Chopper
Hall
Plate
GND
SIP Package
Pin 1 – V
DD
Pin 2 – GND
Pin 3 – OUT
SOT Package
Pin 1 – V
DD
Pin 2 – OUT
Pin 3 – GND
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V1.10 May 1, 2011
A1103
Unipolar Hall-Effect Digital Switch
General Descriptions
The A1103 is a unipolar Hall-effect sensor IC fabricated
from bipolar technology. The device integrates a voltage
regulator, reverse battery protection diode, Hall sensor with
dynamic offset cancellation system, temperature
compensation circuitry, small signal amplifier, Schmitt
trigger and an open-collector output to sink up to 25 mA.
With suitable output pull up, they can be used with bipolar
or CMOS logic circuits.
These Hall-effect switches are monolithic integrated circuits
with tighter magnetic specifications, designed to operate
continuously over extended temperatures to +150℃,and are
more stable with both temperature and supply voltage
changes. The unipolar switching characteristic makes these
devices ideal for use with a simple bar or rod magnet.
Thanks to its wide operating voltage range and extended
choice of temperature range, it is quite suitable for use in
automotive, industrial and consumer applications.
The device is delivered in a Small Outline Transistor (SOT)
or in a Plastic Single In Line (SIP 3L flat). Both 3-lead
packages are RoHS compliant.
Glossary of Terms
MilliTesla (mT),
RoHS
Operating Point (B
OP
)
Gauss
Units of magnetic flux density: 1mT = 10 Gauss
Restriction of Hazardous Substances
Magnetic flux density applied on the branded side of the package which turns the output
driver ON (V
OUT
= V
DSon
)
Release Point (B
RP
)
Magnetic flux density applied on the branded side of the package which turns the output
driver OFF (V
OUT
= high)
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V1.10 May 1, 2011
A1103
Unipolar Hall-Effect Digital Switch
Pin Definitions and Descriptions
SOT Pin
№
1
2
3
SIP Pin
№
1
3
2
Name
VDD
OUT
GND
Type
Supply
Output
Ground
Function
Supply Voltage pin
Open Drain Output pin
Ground pin
Absolute Maximum Ratings
Parameter
Supply Voltage
Supply Current
Output Voltage
Output Current
Storage Temperature Range
Absolute maximum ratings
Operating Temperature Range
Temperature Suffix “E”
Temperature Suffix “K”
Temperature Suffix “L”
Symbol
TA
TA
TA
Value
-40 to 85
-40 to 125
-40 to 150
Units
°C
°C
°C
Symbol
VDD
IDD
VOUT
IOUT
TS
Value
28
50
28
50
-65 to 170
Units
V
mA
V
mA
°C
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum- rated conditions for
extended periods may affect device reliability
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V1.10 May 1, 2011
A1103
Unipolar Hall-Effect Digital Switch
General Electrical Specifications
DC Operating Parameters T
A
= 25℃, V
DD
= 4.5V to 24V (unless otherwise specified)
Parameter
Supply Voltage
Supply Current
Output Saturation Voltage
Output Leakage Current
Output Rise Time
Output Fall Time
Symbol
VDD
IDD
VDSon
IOFF
tr
tf
Test Conditions
Operating
B < B
RP
IOUT = 20mA, B > B
OP
B < B
RP
VOUT = 24V
RL = 820Ω, CL = 20pF
RL =820Ω, CL = 20pF
Min
4.5
4
5
0.3
0.1
0.04
0.18
Typ
Max
24
7
0.5
10
2.0
2.0
Units
V
mA
V
µA
µs
µs
Magnetic Specifications
DC Operating Parameters VDD = 4.5V to 24V (unless otherwise specified)
Parameter
Operating Point
Release Point
Hysteresis
Symbol
B
OP
B
RP
B
HYS
Ta=25℃,Vdd=12V DC
Test Conditions
Min
150
100
Typ
170
125
45
Max
190
160
Units
G
G
G
Application Information
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V1.10 May 1, 2011
Real-time operating system RTOS
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