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PDF US5881 Data sheet ( Hoja de datos )
| Número de pieza | US5881 | |
| Descripción | CMOS Multi-Purpose Switch | |
| Fabricantes | ETC | |
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US5881
CMOS Multi-Purpose Switch
Features and Benefits
• Chopper stabilized amplifier stage
• New miniature package / thin, high reliability package
• Operation down to 3.5V
• CMOS for optimum stability, quality and cost
Applications
• Solid state switch
• Limit switch
• Current limit
• Interrupter
• Current sensing
Ordering Information
Part No.
US5881
US5881
Temperature Suffix
E
L
Package
SO or UA
SO or UA
Temperature Range
-40oC to 85oC Extended
-40oC to 150oC Automotive
*Contact factory or sales representative for legacy temperature options
Functional Diagram
VDD
Voltage
Regulator
Chopper
Output
UA Package
Pin 1 - V D D
Pin 2 - GND
Pin 3 - Output
GND
SO Package
Pin 1 - VD D
Pin 2 - Output
Pin 3 - GND
Description
The US5881 is a unipolar Hall effect sensor IC fab-
ricated 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 applications of solid state switches.
The output transistor will be switched on (BOP) in
the presence of a sufficiently strong South pole
magnetic field facing the marked side of the pack-
age. Similarly, the output will be switched off (BRP)
in the presence of a weaker South field and remain
off with “0” field. The SOT-23 device is reversed
from the UA package. The SOT-23 output transis-
tor will be switched on (BOP) in the presence of a
sufficiently strong North pole magnetic field sub-
jected to the marked face.
Note: This is a static-sensitive device; please observe ESD precau -
tions. Reverse VDD protection is not included. For reverse voltage
protection, a 100Ωresistor in series with VDD is recommended.
US5881 CMOS Multi-Purpose Switch
3901005881 Rev 5.0
24/July/01
Page 1
1 page  
US5881
CMOS Multi-Purpose Switch
Unique Features
CMOS Hall IC Technology
The chopper stabilized amplifier uses switched ca-
pacitor techniques to eliminate the amplifier offset
voltage, which, in bipolar devices, is a major source
of temperature sensitive drift. CMOS makes this ad-
vanced 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 contrib-
utes to lower physical stress and less power con-
sumption.
Installation
Consider temperature coefficients of Hall IC and
magnetics, as well as air gap life time variations. Ob-
serve temperature limits during wave soldering.
Application Comments
If reverse supply protection is desired, use a resistor
in series with the VDD pin. The resistor will limit the
supply current (Fault), IDD, to 50 mA. For severe
EMC conditions, use the application circuit below.
Applications Examples
Automotive and Severe
Environment Protection Circuit
R1 100Ω
D1
Supply
Voltage
Z1
C1
4.7 nF
VDD
Hall IC
Vss
RL
1.2K
OUT
C2
4.7nF
Two Wire Optional Current
Biasing Circuit
V
DD
IIN
RL Iout
Hall
Rb IC
US5881 CMOS Multi-Purpose Switch
The resistors R b and RL can be used to bias the input current, IIN. Refer to
the part specification for limiting values. This circuit will help in getting the
precise ON and OFF currents desired.
BRP = Ioff = (VDD / Rb + IDD )
BOP = Ion = (Ioff + VDD / R L )
3901005881 Rev 5.0
24/July/01
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet US5881.PDF ] | |
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