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US3881LSO Datasheet

  • US3881LSO

  • CMOS Low Voltage Hall Effect Latch

  • 6頁

  • ETC

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US3881
CMOS Low Voltage Hall Effect Latch
Features and Benefits
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Chopper stabilized amplifier stage
Optimized for BDC motor applications
New miniature package / thin, high reliability package
Operation down to 2.2V
CMOS for optimum stability, quality, and cost
Applications
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Solid state switch
Brushless DC motor commutation
Speed sensing
Linear position sensing
Angular position sensing
Current sensing
Ordering Information
Part No.
US3881
US3881
Temperature Suffix
Package
Temperature Range
E
SO or UA
-40
o
C to 85
o
C Commercial
L
SO or UA
-40
o
C to 150
o
C Automotive
* Contact factory or Sale Representative for legacy temperature options
Functional Diagram
Description
The US3881 is a bipolar Hall effect sensor IC fabri-
cated from mixed signal CMOS technology. It in-
corporates advanced chopper stabilization tech-
niques to provide accurate and stable magnetic
switch points. There are many applications for this
sensor in addition to those listed above. The de-
sign, specifications, and performance have been
optimized for commutation applications in 5V and
12V brushless DC motors.
The output transistor will be latched on (B
OP
) in the
presence of a sufficiently strong South pole mag-
netic field facing the marked side of the package.
Similarly, the output will be latched off (B
RP
) in the
presence of a North field.
SO Package
Pin 1 - V
DD
Pin 2 - Output
Pin 3 - GND
V
DD
Output
Voltage
Regulator
Chopper
GND
UA Package
Pin 1 - V
DD
Pin 2 - GND
Pin 3 - Output
The SOT-23 device is reversed from the UA pack-
age. The SOT-23 output transistor will be latched
on in the presence of a sufficiently strong North
pole magnetic field subjected to the marked face.
Note:
Static sensitive device; please observe ESD precautions. Re -
verse V
DD
protection is not included. For reverse voltage protec -
tion, a 100鈩?resistor in series with V
DD
is recommended.
US3881 CMOS Low Voltage Hall Effect Latch
3901003881 Rev 4.2
7/23/01
Page 1

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