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PDF US2881 Data sheet ( Hoja de datos )
| Número de pieza | US2881 | |
| Descripción | Bipolar Hall Switch - Very High Sensitivity | |
| Fabricantes | Melexis Microelectronic Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de US2881 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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US2881
Bipolar Hall Switch – Very High Sensitivity
Features and Benefits
Wide operating voltage range from 3.5V to 24V
Very high magnetic sensitivity
CMOS technology
Chopper-stabilized amplifier stage
Low current consumption
Open drain output
Thin SOT23 3L and flat TO-92 3L
both RoHS Compliant packages
www.DataSheet4U.com
Ordering Information
Part No.
US2881
US2881
US2881
US2881
Temperature Code
E (-40°C to 85°C)
E (-40°C to 85°C)
L (-40°C to 150°C)
L (-40°C to 150°C)
Application Examples
Automotive, Consumer and Industrial
Solid-state switch
Brushless DC motor commutation
Speed detection
Linear position detection
Angular position detection
Proximity detection
Package Code
SE (TSOT-3L)
UA (TO-92)
SE (TSOT-3L)
UA (TO-92)
1 Functional Diagram
2 General Description
The Melexis US2881 is a bipolar Hall-effect switch
designed in mixed signal CMOS technology.
The device integrates a voltage regulator, Hall
sensor with dynamic offset cancellation system,
Schmitt trigger and an open-drain output driver, all
in a single package.
Thanks to its wide operating voltage range and
extended choice of temperature range, it is
suitable for use in automotive and consumer
applications.
The device is delivered in a Thin Small Outline
Transistor (TSOT) for surface mount process and
in a Plastic Single In Line (TO-92 flat) for through-
hole mount.
Both 3-lead packages are RoHS compliant.
3901002881
Rev 012
Page 1 of 12
Data Sheet
Aug/06
1 page  
US2881
Bipolar Hall Switch – Very High Sensitivity
9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US2881 is a Hall-effect device with very high magnetic
sensitivity. It allows using generic magnets, weak magnets or larger air gap.
The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed
with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and
contributes to smaller chip size and lower current consumption than bipolar technology. The small chip size is
www.DataSheet4UaT.lhcsoiosmacnomimbpinoarttiaonnt
factor to minimize the
results in more stable
effect of physical stress.
magnetic characteristics
and
enables
faster
and
more
precise
design.
The wide operating voltage from 3.5V to 24V, “L” and “E” operating temperature range and low current
consumption make this device especially suitable for automotive and BLDC motor applications.
The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using
a pull-up resistor tied between a pull-up voltage and the device output.
10 Unique Features
The US2881 exhibits bipolar magnetic switching characteristics. Therefore, it operates with both south and
north poles.
Typically, the device behaves as a latch with symmetric
operating and release switching points (BOP=|BRP|). This means
magnetic fields with equivalent strength and opposite direction
drive the output high and low.
Removing the magnetic field (B→0) keeps the output in its
previous state. This latching property defines the device as a
magnetic memory.
Latch characteristic
Depending on the magnetic switching points, the device may also behave as a unipolar positive switch (BOP
and BRP strictly positive) or negative switch (BOP and BRP strictly negative). That is the output can be set high
and low by only using one magnetic pole. In such case, removing the magnetic field changes the output level.
Unipolar positive switch characteristic
Unipolar negative switch characteristic
In latch, positive or negative switch behaviour, a magnetic hysteresis BHYST keeps BOP and BRP separated by
a minimal value. This hysteresis prevents output oscillation near the switching point.
3901002881
Rev 012
Page 5 of 12
Data Sheet
Aug/06
5 Page 
US2881
Bipolar Hall Switch – Very High Sensitivity
17.2 UA Package (TO-92 flat)
www.DataSheet4U.com
3901002881
Rev 012
Page 11 of 12
Data Sheet
Aug/06
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet US2881.PDF ] | |
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