SS109
Unipolar Hall Switch
Packages
Features and Benefits
–
–
–
–
–
–
–
–
–
Wide operating voltage range from 2.5V to 24V
Medium sensitivity
CMOS technology
Chopper-stabilized amplifier stage
Superior temperature stability
Insensitive to physical stress
Open drain output
Low current consumption
Small Size-SOT23 3L or SIP 3L
both RoHS Compliant packages
3 pin SOT23 (suffix SO)
3 pin SIP (suffix UA)
Functional Block Diagram
VDD
Voltage
Regulator
Application Examples
–
–
–
–
–
–
–
Automotive, Consumer and Industrial
Solid-state switch
Interrupter
Speed detection
Angular position detection
Linear position detection
Proximity detection
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
General Description
The SS109 is a unipolar Hall effect sensor IC fabricated
from mixed signal CMOS technology. The device
integrates a voltage regulator, Hall sensor with dynamic
offset cancellation system, Schmitt trigger and an
open-drain output driver, all in a single package.
It incorporates advanced chopper stabilization techniques to provide accurate and stable magnetic switch points. There
are many applications for this HED – Hall Electronic Device - in addition to those listed above.
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.
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SS109
Unipolar Hall Switch
Glossary of Terms
MilliTesla (mT), Gauss
RoHS
SOT
ESD
BLDC
Operating Point (B
OP
)
Release Point (B
RP
)
Units of magnetic flux density: 1mT = 10 Gauss
Restriction of Hazardous Substances
Small Outline Transistor (SOT package) - also referred with the package code “SO”
Electro-Static Discharge
Brush-Less Direct-Current
Magnetic flux density applied on the branded side of the package which turns the output
driver ON (V
OUT
= V
DSon
)
Magnetic flux density applied on the branded side of the package which turns the output
driver OFF (V
OUT
= high)
Pin Definitions and Descriptions
SOT Pin
№
SIP Pin
№
1
2
3
1
3
2
Name
VDD
OUT
GND
Type
Supply
Output
Ground
Function
Supply Voltage pin
Open Drain Output pin
Ground pin
Table 1: Pin definitions and descriptions
Absolute Maximum Ratings
Parameter
Supply Voltage
Supply Current
Output Voltage
Output Current
Storage Temperature Range
Maximum Junction Temperature
Table 2: Absolute maximum ratings
Operating Temperature Range
Temperature Suffix “E”
Temperature Suffix “K”
Temperature Suffix “L”
Symbol
T
A
T
A
T
A
Value
-40 to 85
-40 to 125
-40 to 150
Units
°C
°C
°C
Symbol
V
DD
I
DD
V
OUT
I
OUT
T
S
T
J
Value
28
50
28
50
-50 to 150
165
Units
V
mA
V
mA
°C
°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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SS109
Unipolar Hall Switch
General Electrical Specifications
DC Operating Parameters T
A
= 25℃, V
DD
= 2.5V to 24V (unless otherwise specified)
Parameter
Supply Voltage
Supply Current
Output Saturation Voltage
Output Leakage Current
Output Rise Time
Output Fall Time
Maximum Switching Frequency
Package Thermal Resistance
Symbol
V
DD
I
DD
V
DSon
I
OFF
t
r
t
f
F
SW
R
TH
Test Conditions
Operating
B < B
RP
I
OUT
= 20mA, B > B
OP
B < B
RP
V
OUT
= 24V
R
L
= 1kΩ, C
L
= 20pF
R
L
= 1kΩ, C
L
= 20pF
---
Single layer (1S) Jedec board
Min
2.2
Typ
Max
24
5
0.5
10
Units
V
mA
V
µA
µs
µs
KHz
°C/W
1
0.25
0.25
10
301
Table 3: Electrical Specifications
Note:
The output of SS109 will be switched after the supply voltage is over 2.2V, but the magnetic
characteristics won't be normal until the supply is over 2.5V.
Magnetic Specifications
DC Operating Parameters V
DD
= 2.5V to 24V (unless otherwise specified)
SS109
Parameter
Operating Point
Release Point
Hysteresis
Operating Point
Release Point
Hysteresis
Operating Point
Release Point
Hysteresis
Symbol
B
OP
B
RP
B
HYST
B
OP
B
RP
B
HYST
B
OP
B
RP
B
HYST
Test Conditions
E spec., T
A
= 85°C
Min
-150
-120
30
-160
-130
30
-170
-140
30
Typ
-120
-80
40
-120
-80
40
-120
-80
40
Max
-90
-40
50
-85
-35
50
-80
-30
50
Units
G
G
G
G
G
G
G
G
G
K spec., T
A
= 125°C
L spec., T
A
= 150°C
Table 4: Magnetic Specifications
Output Behavior versus Magnetic Pole
DC Operating Parameters T
A
= -40℃ to 150℃, V
DD
= 2.5V to 24V (unless otherwise specified)
Parameter
Test Conditions
OUT
Low
Low
High
South pole (SOT )
B > B
OP
North pole ( TO)
B > B
OP
Null or weak magnetic field
B = 0 or B < B
RP
Table5:Output behavior versus magnetic pole
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SS109
Unipolar Hall Switch
Application Information
It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor)
between the supply (VDD Pin) and ground (GND Pin) of the device to reduce both external noise and noise generated
by the chopper stabilization technique. As is shown in the two figures in next page, a 0.1μF capacitor is typical.
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 (V
CC
/ R1
≤
50mA)
- the resulting device supply voltage V
DD
has to be higher than V
DD
min (V
DD
= V
CC
– R1*I
DD
)
- the resistor has to withstand the power dissipated in reverse voltage condition (P
D
= V
CC 2
/R1)
When using a diode, a reverse current cannot flow and the voltage drop is almost constant (≈0.7V).
Therefore, a 100Ω/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 the 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 V
DD
. The diode D1 provides additional reverse voltage protection.
Typical Three-Wire Application Circuit
Automotive and Severe
Environment Protection Circuit
R1:100
C1
VDD
R2
OUT
C2
D1
Z1
C1
VDD
R2
OUT
C2
SS109
GND
SS109
GND
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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SS109
Unipolar Hall Switch
Package Information
Package A, 3-Pin SIP:
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