US5781LUA Melexis Inc, US5781LUA Datasheet - Page 40
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US5781LUA
Manufacturer Part Number
US5781LUA
Description
IC HALL EFFECT SWITCH TO-92UA
Manufacturer
Melexis Inc
Type
Unipolar Switchr
Specifications of US5781LUA
Sensing Range
15mT Trip, 3.5mT Release
Voltage - Supply
3.5 V ~ 24 V
Current - Supply
5mA
Current - Output (max)
50mA
Output Type
Digital, Open Drain
Operating Temperature
-40°C ~ 150°C
Package / Case
TO-92UA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
US5781LUA
Manufacturer:
FREESCALE
Quantity:
439
Programmable Motion Sensors
The use of Hall-Effect Sensors as an alternative to resistive potentiometers is a popular trend because of
the advantages of non-contacting elements. in the past, linear Hall ICs were not very practical because of
bad temperature prformance and the ned for disctete trimming methods.
Melexis created it’s programmable linear Hall ICs to solve both problems, leaving the end-user a very
accurate sensor which is stable over temperature.
The configurations are infinite, shown are two basic magntic circuits which will allow literally thousands
of position sensing applications.
Rotary Motion
Figure 27 is the rotary method, where the Hall Ic is placed within a ring magnet, and the manetic field is
linear to the rotary motion. Depending on the magnetic elements, this method can be linear up to 160
typically, as shown 45
position application.
Linear Motion
Figure 28 illustrates a linear position sensor, where a linear motion (as apposed to rotary motion) is trans-
lated to a liear voltage via the Hall IC. The magnetic circuit shown is linear for approximately 50% of the
entire length of magnet. For example, if the magnets were 1” long, they can be used to measure 1/2” of
motion.
Programming
To further enhance the system, the sensors are programmable to give optimal results. Details about pro-
gramming are available in the MLX90215 and MLX90237 datasheets in section 4 of this book
Figure 27, Programmable Rotary Potentiometer
o
-90
o
of linearity can be easily achieved. This configuration is suitable for any rotary
3-25
N
S
Section 3 - Applications
PTC
TM
o
, but