深圳凯祥科技有限公司
CMOS Omnipolar High Sensitivity Micropower Hall Switch 1．Features
¾ Micropower consumption for battery powered
applications
¾ Omnipolar, output switches with absolute value of
North or South pole from magnet ¾ Operation down to 2.5V
¾ High sensitivity for direct reed switch
replacement applications
Chopper stabilized amplifier stage2．Description
Ｔｈｅ ２４８ Ｏｍｎｉｐｏｌａｒ Ｈａｌｌ ｅｆｆｅｃｔ ｓｅｎｓｏｒ IC is fabricated from mixed signal Ｔｈｅ ＤＨ４８１ Ｏｍｎｉｐｏｌａｒ Ｈａｌｌ ｅｆｆｅｃｔ ｓｅｎｓｏｒ
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
Ｔｈｅ ｏｕｔｐｕｔ ｔｒａｎｓｉｓｔｏｒ ｏｆ ｔｈｅ ２４８ ｗill be latched on (Bop) in the presence Ｔｈｅ ｏｕｔｐｕｔ ｔｒａｎｓｉｓｔｏｒ ｏｆ ｔｈｅ ＤＨ４８１ ｗ
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.
深圳凯祥科技有限公司
3．Applications
¾ Solid state switch
¾ Handheld Wireless Handset Awake Switch ¾ Lid close sensor for battery powered devices
¾ Magnet proximity sensor for reed switch replacement in low duty cycle
applications
4．Typical Application Circuit
Eastera'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 capacitor 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.
5．
Functional Block Diagram
深圳凯祥科技有限公司
6．Pinning
Mark View
Pin Description
NAME
NO
STATUS
DESCRIPTION
Power IC
7．Internal Timing Circuit
8．Absolute Maximum Ratings
Symbol Value Units Parameter
Supply Voltage(operating) VDDSupply Current IOutput Voltage VOUTOutput Curent IOUTOperating Temperature Range TA-40 to 85 °C
Storage Temperature Rang TS-50 to 150 °C ESD Sensitivity - 4000 V
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum rated conditions for extended periods may affect device reliability.
9．DC Electrical Characteristics
DC Operating Parameters: TA = 25℃, VDD=2.75V. Parameter Symbol VDDOperating voltage
IDDSupply current Output Current
Saturation Voltage Awake mode time Sleep mode time
IOUTVSATTAWTSL
Test Conditions MinTyp Max Units μA
IOUT
1mA μS 10．Magnetic Characteristics
Operating Parameters: TA = 25℃, VDD=2.75VDC.
PARAMETER Symbol Min Type Max ＋／－２０Operating Point Bop +/-35 +/-60
Release Point Brp +/-5 +/-21 ４５２１６
Units Gs Gs
11．ESD Protection
Human Body Model (HBM) tests according to: Mil. Std. 883F method 3015.7
Parameter Symbol Limit Values Unit Notes
Min Max
ESD Voltage VESD ±4
12．
Performance Characteristics
深圳凯祥科技有限公司
13．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 magnetics , as well as air gap and life time variations. Observe temperature limits during wave soldering. Typical IR solder-reflow profile:
¾ No Rapid Heating and Cooling.
¾ Recommended Preheating for max. 2minutes at 150°C
¾
Recommended Reflowing for max. 5seconds at 240°C
14．ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
深圳凯祥科技有限公司
15．Package Information
15.1 SOT-23 Package Physical Characteristics
Notes:
1). PINOUT: Pin 1 VDD Pin 2 Output Pin 3 GND
2). All dimensions are in millimeters ;
Marking:
48 -- Code of Device ( DH481 ) yy -- last 2 digit of year ;
m -- “A”-“Z”, Production Lot ;
End View
0.20MIN
SOT-23 Package Hall Location
15.2 TSOT-23 Package Physical Characteristics
ＤＨ４８１
ＤＨ４８１
TSOT-23 Package Hall Location
深圳凯祥科技有限公司
15.3 TO-92 Package Physical Characteristics
Sensor Location
Notes:
1). Controlling dimension : mm ;
2). Lesds 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
16. Ordering Information
Part No. Temperature Suffix Package Code
to 85℃) UA( TO-92S) SO(SOT-23) ST(TSOT-23)
ＤＨ４８１
(40℃
深圳凯祥科技有限公司
CMOS Omnipolar High Sensitivity Micropower Hall Switch 1．Features
¾ Micropower consumption for battery powered
applications
¾ Omnipolar, output switches with absolute value of
North or South pole from magnet ¾ Operation down to 2.5V
¾ High sensitivity for direct reed switch
replacement applications
Chopper stabilized amplifier stage2．Description
Ｔｈｅ ２４８ Ｏｍｎｉｐｏｌａｒ Ｈａｌｌ ｅｆｆｅｃｔ ｓｅｎｓｏｒ IC is fabricated from mixed signal Ｔｈｅ ＤＨ４８１ Ｏｍｎｉｐｏｌａｒ Ｈａｌｌ ｅｆｆｅｃｔ ｓｅｎｓｏｒ
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
Ｔｈｅ ｏｕｔｐｕｔ ｔｒａｎｓｉｓｔｏｒ ｏｆ ｔｈｅ ２４８ ｗill be latched on (Bop) in the presence Ｔｈｅ ｏｕｔｐｕｔ ｔｒａｎｓｉｓｔｏｒ ｏｆ ｔｈｅ ＤＨ４８１ ｗ
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.
深圳凯祥科技有限公司
3．Applications
¾ Solid state switch
¾ Handheld Wireless Handset Awake Switch ¾ Lid close sensor for battery powered devices
¾ Magnet proximity sensor for reed switch replacement in low duty cycle
applications
4．Typical Application Circuit
Eastera'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 capacitor 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.
5．
Functional Block Diagram
深圳凯祥科技有限公司
6．Pinning
Mark View
Pin Description
NAME
NO
STATUS
DESCRIPTION
Power IC
7．Internal Timing Circuit
8．Absolute Maximum Ratings
Symbol Value Units Parameter
Supply Voltage(operating) VDDSupply Current IOutput Voltage VOUTOutput Curent IOUTOperating Temperature Range TA-40 to 85 °C
Storage Temperature Rang TS-50 to 150 °C ESD Sensitivity - 4000 V
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum rated conditions for extended periods may affect device reliability.
9．DC Electrical Characteristics
DC Operating Parameters: TA = 25℃, VDD=2.75V. Parameter Symbol VDDOperating voltage
IDDSupply current Output Current
Saturation Voltage Awake mode time Sleep mode time
IOUTVSATTAWTSL
Test Conditions MinTyp Max Units μA
IOUT
1mA μS 10．Magnetic Characteristics
Operating Parameters: TA = 25℃, VDD=2.75VDC.
PARAMETER Symbol Min Type Max ＋／－２０Operating Point Bop +/-35 +/-60
Release Point Brp +/-5 +/-21 ４５２１６
Units Gs Gs
11．ESD Protection
Human Body Model (HBM) tests according to: Mil. Std. 883F method 3015.7
Parameter Symbol Limit Values Unit Notes
Min Max
ESD Voltage VESD ±4
12．
Performance Characteristics
深圳凯祥科技有限公司
13．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 magnetics , as well as air gap and life time variations. Observe temperature limits during wave soldering. Typical IR solder-reflow profile:
¾ No Rapid Heating and Cooling.
¾ Recommended Preheating for max. 2minutes at 150°C
¾
Recommended Reflowing for max. 5seconds at 240°C
14．ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
深圳凯祥科技有限公司
15．Package Information
15.1 SOT-23 Package Physical Characteristics
Notes:
1). PINOUT: Pin 1 VDD Pin 2 Output Pin 3 GND
2). All dimensions are in millimeters ;
Marking:
48 -- Code of Device ( DH481 ) yy -- last 2 digit of year ;
m -- “A”-“Z”, Production Lot ;
End View
0.20MIN
SOT-23 Package Hall Location
15.2 TSOT-23 Package Physical Characteristics
ＤＨ４８１
ＤＨ４８１
TSOT-23 Package Hall Location
深圳凯祥科技有限公司
15.3 TO-92 Package Physical Characteristics
Sensor Location
Notes:
1). Controlling dimension : mm ;
2). Lesds 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
16. Ordering Information
Part No. Temperature Suffix Package Code
to 85℃) UA( TO-92S) SO(SOT-23) ST(TSOT-23)
ＤＨ４８１
(40℃