US5781EUA Melexis Inc, US5781EUA Datasheet - Page 33
![IC HALL EFFECT SWITCH TO-92UA](/photos/19/49/194973/us5781eua_sml.jpg)
US5781EUA
Manufacturer Part Number
US5781EUA
Description
IC HALL EFFECT SWITCH TO-92UA
Manufacturer
Melexis Inc
Type
Unipolar Switchr
Specifications of US5781EUA
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 ~ 85°C
Package / Case
TO-92UA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Flow Meter
One popular device that uses a Hall IC is a flow meter (Figure 15). The spoked wheel (paddle wheel), is
driven by some type of medium flowing through the pipe. A magnet is attached at the tip of each spoke.
In the presence of moving vapor or liquid, the magnets spin at a speed related to the viscosity of the medi-
um flowing through the device. The spinning magnets will switch the Hall IC, producing a square wave
output, with a frequency proportional to the flow rate.
Figure 19, Flow Meter
N
S
Liquid or vapor entering in the
direction of the arrow spins the
paddle wheel switching the Hall
IC “ON” and “OFF”, creating a
square wave output
.
Power Control
Many switches must control significant power. A Hall IC can do this only through a relay or Power FET.
For a component cost of $1.00, an isolated 50 Volt, 50 Amp switch can be made.
Figure 20, Power Switch
12V
Load
U18
627
Section 3 - Applications
3-19