SS2712

SS2712
Hall Latch - High Sensitivity
Features and Benefits
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Application Examples
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Wide operating voltage range from 2.5V to 24V
High magnetic sensitivity – Multi-purpose
CMOS technology
Chopper-stabilized amplifier stage
 Superior temperature stability
 Extremely low switchpoint drift
 Insensitive to physical stress
Low current consumption
Output driver with internal pull-up resistor
SOT23 3L and flat SIP 3L both RoHS
Compliant packages
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
Regulator
Rpull
OUT
Chopper
Hall
Plate
GND
UA Package
Pin 1 – VDD
Pin 2 – GND
SO Package
Pin 1 – VDD
Pin 2 – OUT
Pin 3 – OUT
Pin 3 – GND
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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
General Description
been optimized for commutation applications in 5V and
12V brushless DC motors.
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) for surface mount process or in a Plastic
Single In Line (SIP 3L flat) for through- hole mount.
Both 3-lead packages are RoHS compliant.
The SS2712 is a bipolar 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 output driver with internal pull-up resistor, 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. The design, specifications and performance have
Glossary of Terms
MilliTesla (mT), Gauss
Units of magnetic flux density: 1mT = 10 Gauss
RoHS
Restriction of Hazardous Substances
Operating Point (BOP)
Magnetic flux density applied on the branded side of the package
which turns the output driver ON (VOUT = VDSon)
Release Point (BRP)
Magnetic flux density applied on the branded side of the package
which turns the output driver OFF (VOUT = high)
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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
Pin Definitions and Description
SOT Pin № SIP Pin №
Name
Type
Function
1
1
VDD
Supply
Supply Voltage pin
2
3
OUT
Output
Open Drain Output pin
3
2
GND
Ground
Ground pin
Detailed General Description
The SS2712 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to
operate properly.
The OUT pin of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds the operate point threshold, BOP. After turn-on, the output voltage is VDSon. Note that the device latches, that
is, a south pole of sufficient strength towards the branded surface of the device turns the device on. The device remains on if the south pole is removed (B→0). This latching property defines the device as a magnetic memory.
When the magnetic field is reduced below the release point, BRP , the OUT pin turns off (goes high). The difference in the magnetic operate and release points is the hysteresis, BHYS , of the device. This built-in hysteresis prevents output oscillation near the switching point, and allows clean switching of the output even in the presence of
external mechanical vibration and electrical noise.
The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means
magnetic fields with equivalent strength and opposite direction drive the output high and low.
Powering-on the device in the hysteresis region (less than BOP and higher than BRP) allows an indeterminate output
state. The correct state is attained after the first excursion beyond BOP or BRP .
The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the presence of a sufficiently strong North pole magnetic field applied to the marked face.
Output level
Output level
OUT = High
OUT = High
BHYS
BHYS
OUT = Low
OUT = Low
BRP
-30Gs typ
0mT
BOP
30Gs typ
BRP
-30Gs typ
Flux density
UA package - Latch characteristic
SO
3
package
0mT
BOP
30Gs typ
Flux density
- Latch characteristic
V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
Unique Features
Based on mixed signal CMOS technology, SS2712 is a Hall-effect device with high magnetic sensitivity. This
multi-purpose latch meets most of the application requirements.
The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed with
Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and contributes to
smaller chip size and lower current consumption than bipolar technology. The small chip size is also an important
factor to minimize the effect of physical stress. This combination results in more stable magnetic characteristics
and enables faster and more precise design.
The wide operating voltage from 2.5V to 24V, low current consumption and large choice of operating temperature
range according to “L”, “K” and “E” specification make this device suitable for automotive, industrial and consumer applications.
Absolute Maximum Ratings
Parameter
Symbol
Value
Units
Supply Voltage
VDD
28
V
Supply Current
IDD
50
mA
Output Voltage
VOUT
28
V
Output Current
IOUT
50
mA
Storage Temperature Range
TS
Maximum Junction Temperature
TJ
Operating Temperature Range
Symbol
-50 to 150
°C
165
°C
Value
Units
Temperature Suffix “ E”
TA
-40 to 85
°C
Temperature Suffix “ K”
TA
-40 to 125
°C
Temperature Suffix “ L”
TA
-40 to 150
°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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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
General Electrical Specifications
DC Operating Parameters TA = 25°C, VDD= 2.5V to 24V (unless otherwise specified)
Typ
Parameter
Symbol
Test Conditions
Min
Supply Voltage
VDD
Operating
2.5
Supply Current
IDD
B < BRP
Output Saturation Voltage
VDSon
IOUT = 20mA, B > BOP
Output Leakage Current
IOFF
B < BRP VOUT = 24V
1
Output Rise Time
Tr
RL = 1kΩ, CL = 20pF
0.25
µs
Output Fall Time
Tf
RL = 1kΩ, CL = 20pF
0.25
µs
Rpu
---
FSW
---
10
KHz
RTH
Single layer (1S) Jedec board
301
°C/W
Internal pull-up resistor
Maximum Switching Fre-
9
Max
Units
24
V
5
mA
0.5
V
10
µA
kΩ
15
12
quency
Package Thermal Resistance
Note: The output of SS2712 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 VDD = 2.5 to 24V (unless otherwise specified)
Package
Parameter
Symbol
Operating Point
BOP
Test Conditions
Min
Typ
Max
Units
5
30
55
G
-55
-30
-5
G
Ta=25°C
UA
Release Point
BRP
Hysteresis
BHYST
Operating Point
BOP
Vdd=5V DC
60
G
-55
-30
-5
G
5
30
55
G
Ta=25°C
SO
Release Point
Hysteresis
BRP
Vdd=5V DC
BHYST
60
G
Output Behavior versus Magnetic Pole
DC Operating Parameters TA = -40°C to 150°C, VDD = 2.5 to 24V (unless otherwise specified)
Test Conditions (UA)
Test Conditions (SO)
OUT
B < BRP
B > BRP
High
B > BOP
B < BOP
Low
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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be turned on(drops low) in the presence of a
sufficiently strong North pole magnetic field applied to the marked face and turned off(hoists high) in the presence of a sufficiently
strong South pole magnetic field.
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 following figure, a 0.1μF capacitor is typical.
Typical Three-Wire Application Circuit
VDD
C1
SS2712
R2
OUT
C2
GND
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 = VCC2/R1)
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 following figure 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.
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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
Automotive and Severe Environment Protection Circuit
R1:100
D1
Z1
VDD
C1
SS2712
R2
OUT
C2
GND
The SS2712 have been optimized for commutation applications in 5V and 12V brushless DC motors. The following figure is the typical application circuit for 3 phase brushless DC motors.
Standard information regarding manufacturability of Hall IC with different soldering processes
Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity
level according to following test methods:
Reflow Soldering SMD’s (Surface Mount Devices)
• IPC/JEDEC J-STD-020
Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices
(classification reflow profiles according to table 5-2)
• EIA/JEDEC JESD22-A113
Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing
(reflow profiles according to table 2)
Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
• EN60749-20
Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat
• EIA/JEDEC JESD22-B106 and EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Iron Soldering THD’s (Through Hole Devices)
• EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
• EIA/JEDEC JESD22-B102 and EN60749-21
Solderability
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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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
Package Information
2.13
1.87
0.75 ± 0.05
1.52 ± 0.1
Package UA, 3-Pin SIP:
3° ± 1°
1.00
1.20
45° ± 1°
4.0 ± 0.01
1
2
3
3.0 ± 0.01
Sensor Location
Active Area Depth:
0.84(Nom)
3° ± 1°
6° ± 1°
3° ± 1°
6° ± 1°
1
2
0.05 ± 0.05
3
1.6.± 0.1
0.44± 0.01
0.38 ± 0.01
14 .5 ± 1
0.39± 0.01
Notes:
1). Controlling dimension : mm ;
2). Leads must be free of flash and plating voids ;
3). Do not bend leads within 1 mm of lead to package
interface ;
4). PINOUT: Pin 1 VDD
Pin 2 GND
Pin 3 Output
1.27
2.54
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V3.10 Nov 1, 2013
SS2712
Hall Latch - High Sensitivity
Package SO, 3-Pin SOT-23:
Notes
1). PINOUT:
Top
3
2.60
1.50 3.00
1.80
1
Pin 1 VDD
Pin 2 Output
Pin 3 GND
2). All dimensions are in millimeters;
2
1.70
2.10
Side Vie
End
2.70
3.10
0.10
0.25
1.00
1.30
0.70
0.90
0.20
Min
0.00
0.10
0.35
0.50
Hall plate location
Bottom View of SOT-23 Package
3
Chip
0.56
0.66
0.95
2
1
1.50
Ordering Information
Part No.
Pb-free
Temperature Code
Package Code
Packing
SS2712ESOT
YES
-40°C to 85°C
SOT-23
7-in. reel, 3000 pieces/ reel
SS2712EUA
YES
-40°C to 85°C
TO-92
Bulk, 1000 pieces/ bag
SS2712KSOT
YES
-40°C to 125°C
SOT-23
7-in. reel, 3000 pieces/ reel
SS2712KUA
YES
-40°C to 125°C
TO-92
Bulk, 1000 pieces/ bag
SS2712LSOT
YES
-40°C to 150°C
SOT-23
7-in. reel, 3000 pieces/ reel
SS2712LUA
YES
-40°C to 150°C
TO-92
Bulk, 1000 pieces/ bag
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V3.10 Nov 1, 2013