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US1881 Datasheet

  • US1881

  • US1881 General Purpose Hall effect Latch

  • 9頁(yè)

  • ETC

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Features
and Benefits
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n
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n
n
Chopper stabilized amplifier stage
Optimized for BDC motor applications
New miniature package / thin, high reliability package
Operation down to 3.5V
CMOS for optimum stability, quality and cost
Applications
n
n
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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.
Temperature Suffix
Package
o
o
US1881
E ( -40 C to 85 C )
SO (SOT-23) or UA (TO-92 flat)
o
o
US1881
L ( -40 C to 150 C )
SO (SOT-23) or UA (TO-92 flat)
*Contact factory or sales representative for legacy temperature options
Functional Diagram
Description
The US1881 is the industry鈥檚 first Hall integrated
circuit in a SOT-23 package. The US1881 is a
bipolar Hall effect sensor IC fabricated from mixed
signal CMOS technology. It incorporates advanced
chopper stabilization techniques to provide accurate
and stable magnetic switch points. There are many
applications for this HED in addition to those listed
above. The design, 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
magnetic 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
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.
Note:
Static sensitive device; please observe ESD precautions.
Reverse V
DD
protection is not included. For reverse voltage
protection, a 100W resistor in series with V
DD
is recommended.
3901001881
Rev. 012
Page 1
Aug/02

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