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PDF US4881 Data sheet ( Hoja de datos )

Número de pieza US4881
Descripción Bipolar Hall Switch
Fabricantes Melexis 
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Features and Benefits
Operating voltage range from 2.2V to 18V
Very high magnetic sensitivity
CMOS technology
Chopper-stabilized amplifier stage
Low current consumption
Open drain output
SOT23 3L and flat TO-92 3L
both RoHS Compliant packages
US4881
Bipolar Hall Switch
Low Voltage & Very High Sensitivity
Application Examples
Automotive, Consumer and Industrial
Solid-state switch
Brushless DC motor commutation
Speed detection
Linear position detection
Angular position detection
Proximity detection
Ordering Information
Part No.
US4881
US4881
US4881
US4881
US4881
US4881
Temperature Code
E (-40°C to 85°C)
E (-40°C to 85°C)
K (-40°C to 125°C)
K (-40°C to 125°C)
L (-40°C to 150°C)
L (-40°C to 150°C)
Package Code
SO (SOT23-3L)
UA (TO-92)
SO (SOT23-3L)
UA (TO-92)
SO (SOT23-3L)
UA (TO-92)
1 Functional Diagram
2 General Description
The Melexis US4881 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.
The low operating voltage and extended choice of
temperature range make it suitable for use in
automotive, industrial and consumer low voltage
applications.
The devices are delivered in a Small Outline
Transistor (SOT23) 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.
3901004881
Rev 011
Page 1 of 11
Data Sheet
Feb/06

1 page




US4881 pdf
US4881
Bipolar Hall Switch
Low Voltage & Very High Sensitivity
9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US4881 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 techniques 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 also an important factor to minimize the effect of physical stress.
This combination results in more stable magnetic characteristics and enables faster and more precise design.
The operating voltage from 2.2V to 18V, low current consumption and large choice of operating temperature
range according to “L”, “K” and “E” specification make this device suitable for automotive, industrial and
consumer low voltage 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 US4881 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 (B0) 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.
3901004881
Rev 011
Page 5 of 11
Data Sheet
Feb/06

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US4881 arduino
US4881
Bipolar Hall Switch
Low Voltage & Very High Sensitivity
17 Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its
Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with Melexis for current information. This
product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-
support or life-sustaining equipment are specifically not recommended without additional processing by
Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be
liable to recipient or any third party for any damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential
damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical
data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering
of technical or other services.
© 2005 Melexis NV. All rights reserved.
3901004881
Rev 011
For the latest version of this document, go to our website at
www.melexis.com
Or for additional information contact Melexis Direct:
Europe, Africa, Asia:
Phone: +32 1367 0495
America:
Phone: +1 603 223 2362
ISO/TS 16949 and ISO14001 Certified
Page 11 of 11
Data Sheet
Feb/06

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