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PDF US2881 Data sheet ( Hoja de datos )
| Número de pieza | US2881 | |
| Descripción | CMOS High Sensitivity Latch | |
| Fabricantes | ETC | |
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US2881/2882
CMOS High Sensitivity Latch
Features and Benefits
• 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
• Ultra low IDD current
Applications
• Solid state switch
• Brushless DC motor commutation
• Speed sensing
• Linear position sensing
• Angular position sensing
• Current sensing
Ordering Information
Part No.
US2881 / US2882
US2881 / US2882
Temperature Suffix Package
E SO or UA
L SO or UA
Temperature Range
-40oC to 85oC Extended
-40oC to 150oC Full Temp.
*Contact Factory or Sales Representative for Legacy Temperature Versions
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 design specifications and performance of the
Melexis US2881 have been optimized for commu-
tation applications in brushless DC motors and
automotive speed sensing.
The output transistor will be latched on (BOP) 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 (BRP) in the
presence of a North field. The SOT-23 device is
reversed from the UA package. The SOT-23 output
transistor will be latched on (BOP) 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 VDD protection is not included. For reverse voltage protection,
a 100Ω resistor in series with VDD is recommended.
US2881 CMOS High Sensitivity Latch
3901002881 Rev 5.6
23/July/00
Page 1
1 page  
US2881/2882
CMOS High Sensitivity Latch
Unique Features
CMOS Hall IC Technology
The Chopper Stabilized Amplifier, using
switched capacitor techniques, eliminates the
amplifier offset voltage, which in bipolar devices
is a major source of temperature sensitive drift.
CMOS makes this advanced technique possi-
ble.
The CMOS chip is also much smaller than the
Bipolar chip, allowing very sophisticated cir-
cuitry to be placed in less space. The small chip
size also contributes to lower physical stress
and less power consumption.
Installation
Consider temperature coefficients of Hall IC and
magnetics, as well as air gap and life time varia-
tions. Observe temperature limits during wave
soldering.
Application Comments
If reverse supply protection is desired, use a re-
sistor in series with the VDD pin. The resistor will
limit the Supply Current (Fault), IDD, to 50mA.
For severe EMC conditions, use the application
circuit below.
Applications Examples
Automotive and Severe
Environment Protection Circuit
R1 100Ω
D1
Supply
Voltage
Z1
C1
4.7n
F
VDD
1R.2L
K
Hall IC
OUT
4C.72n
F
VSS
Two Wire Optional Current
Biasing Circuit
V
DD
IIN
RL Iout
Hall
Rb IC
US2881 CMOS High Sensitivity Latch
The resistors Rb 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 + DI D )
BOP = Ion = (Ioff + VDD / RL )
3901002881 Rev 5.6
23/July/00
Page 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet US2881.PDF ] | |
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