CMOS Omnipolar High Sensitivity Micropower Hall Switch

SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Packages
Features and Benefits
–
–
Operation down to 2.5V
Micropower consumption for battery
powered applications
High sensitivity for direct reed switch
replacement applications
Omnipolar, output switches with absolute
value of North or South pole from magnet
–
–
3 pin SOT23 (suffix SO)
3 pin SIP (suffix UA)
Functional Block Diagram
Application Examples
–
–
–
–
VDD
Sleep/Awake
Logic
OUT
Solid-state switch
Handheld Wireless Handset Awake Switch
Lid close sensor for battery powered devices
Magnet proximity sensor for reed switch
replacement in low duty cycle applications
Chopper
Hall
Plate
GND
General Description:
The SS259 Omnipolar Hall effect sensor IC is fabricated from mixed signal CMOS technology. It incorporates
advanced chopper-stabilization techniques to provide accurate and stable magnetic switch points.
The circuit design provides an internally controlled clocking mechanism to cycle power to the Hall element and
analog signal processing circuits. This serves to place the high current-consuming portions of the circuit into a
“Sleep” mode. Periodically the device is “Awakened” by this internal logic and the magnetic flux from the Hall
element is evaluated against the predefined thresholds. If the flux density is above or below the BOP/BRP thresholds then the output transistor is driven to change states accordingly. While in the “Sleep” cycle the output transistor is latched in its previous state. The design has been optimized for service in applications requiring extended
operating lifetime in battery powered systems.
The output transistor of the SS259 will be latched on (BOP) in the presence of a sufficiently strong South or North
magnetic field facing the marked side of the package. The output will be latched off (BRP) in the absence of a
magnetic field.
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SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Typical Application Circuit
SEC's pole-independent sensing technique allows for operation with either a north pole or south pole magnet
orientation, enhancing the manufacturability of the device. The state-of-the-art technology provides the same
output polarity for either pole face.
It is strongly recommended that an external bypass be connected (in close proximity to the Hall sensor) between
the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique. This is especially true due to the relatively high impedance of battery supplies.
Internal Timing Circuit
Current
Period
Iaw
Sample & Output
Latched
Iav
Isp
Awake Taw: 175μs
Sleep Tsl: 70ms
0
Time
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SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Pin Definitions and Descriptions
SOT Pin № SIP Pin №
Name
Type
Function
1
2
3
VDD
OUT
GND
Supply
Output
Ground
Supply Voltage pin
Open Drain Output pin
Ground pin
1
3
2
Absolute Maximum Ratings
Parameter
Symbol
Supply Voltage (operating)
Supply Current
Output Voltage
Output Current
Operating Temperature Range
Storage Temperature Range
ESD Sensitivity
VDD
IDD
VOUT
IOUT
TA
TS
-
Value
Units
6
5
6
5
-40 to 85
-50 to 150
4000
V
mA
V
mA
°C
°C
V
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions for extended
periods may affect device reliability.
DC Electrical Characteristics
DC Operating Parameters: TA = 25°C, VDD= 2.75V.
Parameter
Symbol
Operating Voltage
Supply Current
Output Current
Saturation Voltage
Awake mode time
Sleep mode time
VDD
IDD
IOUT
VSAT
TAW
TSL
Test Conditions
Min
Typ
Max
Units
Operating
Average
2.5
3
5
5.5
V
µA
mA
V
µS
mS
1.0
0.4
IOUT = 1mA
Operating
Operating
175
70
ESD Protection
Human Body Model (HBM) tests according to: Mil. Std. 883F method 3015.7
Parameter
Symbol
ESD Voltage
VESD
Limit Values
Min
Max
±4
3
Unit
Notes
kV
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SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Magnetic Characteristics
Output Voltage (V)
3.0
OFF
2.5
2.0
BOPN
BRPS
1.5
BOPS
BRPN
1.0
05
ON
0
-80
-60
-40
-20
0
20
40
60
80
Magnetic Flux (Gauss)
Operating Parameters: TA = 25°C, VDD = 2.75VDC
Parameter
Symbol
Min
Type
Max
Units
Operating Point
Release Point
Hysteresis
BOP
BRP
BHYST
+/-5
-
+/-35
+/-21
14
+/-60
-
Gs
Gs
Gs
Performance Characteristics
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SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched capacitor techniques to eliminate the amplifier offset voltage,
which, in bipolar devices, is a major source of temperature sensitive drift. CMOS makes this advanced technique
possible. The CMOS chip is also much smaller than a bipolar chip, allowing very sophisticated circuitry to be
placed in less space. The small chip size also contributes to lower physical stress and less power consumption.
Installation Comments
Consider temperature coefficients of Hall IC and magnetic, as well as air gap and life time variations. Observe
temperature limits during wave soldering. Typical IR solder-reflow profile:
–
No Rapid Heating and Cooling.
–
Recommended Preheating for max. 2minutes at 150°C
–
Recommended Reflowing for max. 5seconds at 240°C
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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SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
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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SS259
CMOS Omnipolar High Sensitivity Micropower Hall Switch
Package SOT, 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
SOT-23 Package Hall 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
SS259ESOT
YES
-40°C to 85°C
SOT-23
7-in. reel, 3000 pieces/reel
SS259EUA
YES
-40°C to 85°C
TO-92
Bulk, 1000 pieces/bag
SS259KSOT
YES
-40°C to125°C
SOT-23
7-in. reel, 3000 pieces/reel
SS259KUA
YES
-40°C to 125°C
TO-92
Bulk, 1000 pieces/bag
SS259LSOT
YES
-40°C to 150°C
SOT-23
7-in. reel, 3000 pieces/reel
SS259LUA
YES
-40°C to 150°C
TO-92
Bulk, 1000 pieces/bag
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