SS1104
Unipolar Hall Switch-Low Sensitivity
Features and Benefits
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–
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3.5V to 24V Operation
-40℃ to 150℃ Superior temperature operation
CMOS technology
Low current consumption
Chopper-stabilized amplifier stage
Open drain output
Low sensitivity
Small Size-SOT23 3L or SIP 3L
both RoHS compliant packages
Application Examples
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Automotive, Consumer and Industrial
Solid-state switch
Brushless DC motor commutation
Speed detection
Angular position detection
Proximity detection
Current detector
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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SS1104
Unipolar Hall Switch-Low Sensitivity
General Descriptions
The SS1104 is a unipolar Hall-effect sensor IC fabricated
from CMOS technology. The device integrates a voltage
regulator, Hall sensor with dynamic offset cancellation
system, small signal amplifier, Schmitt trigger and an
open-drain output driver. 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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SS1104
Unipolar Hall Switch-Low Sensitivity
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 “E”
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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SS1104
Unipolar Hall Switch-Low Sensitivity
General Electrical Specifications
DC Operating Parameters T
A
= 25℃, V
DD
= 3.5V 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 = 1kΩ, CL = 20pF
RL =1kΩ, CL = 20pF
Min
3.5
1.5
2.5
0.4
0.01
0.25
0.25
Typ
Max
24
5
0.5
10
Units
V
mA
V
µA
µs
µs
Magnetic Specifications
DC Operating Parameters VDD = 3.5V to 24V (unless otherwise specified)
SS1104
Parameter
Operating Point
Release Point
Hysteresis
Symbol
B
OP
B
RP
B
HYS
Ta=25℃,Vdd=12V DC
Test Conditions
Min
160
110
Typ
190
150
40
Max
220
200
Units
G
G
G
Application Information
Typical Three-Wire Application Circuit
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SS1104
Unipolar Hall Switch-Low Sensitivity
Automotive and Harsh, Noisy Environments Three-Wire Circuit
Application Comments
For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between the VDD and ground pin.
For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the VDD pin.
When using a resistor, three points are important:
- the resistor has to limit the reverse current to 50mA maximum (VCC / R1
50mA)
- the resulting device supply voltage VDD has to be higher than VDD min (VDD = VCC – R1.IDD)
- the resistor has to withstand the power dissipated in reverse voltage condition (PD = VCC
2
/ R1)
When using a diode, a reverse current cannot flow and the voltage drop is almost constant (
0.7V).
Therefore, a 100
/0.25W resistor for 5V application and a diode for higher supply voltage are recommended.
Both solutions provide the required reverse voltage protection.
When a weak power supply is used or when the device is intended to be used in noisy environment, it is recommended that figure 13.3
from the Application Information section is used.
The low-pass filter formed by R1 and C1 and the zener diode Z1 bypass the disturbances or voltage spikes
occurring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection.
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
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