US3881EUA Melexis Inc, US3881EUA Datasheet - Page 23
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US3881EUA
Manufacturer Part Number
US3881EUA
Description
IC HALL ELFFECT SW MP TO-92UA
Manufacturer
Melexis Inc
Type
Digital Latchr
Specifications of US3881EUA
Sensing Range
9mT Trip, -9mT Release
Voltage - Supply
2.2 V ~ 18 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
-
Other names
Q3906089
Graph 4, Slide-by With Magnet B, Steep Slope
The effects of mechanical tolerance on a Hall Effect System have just been illustrated. Temperature range
can also affect this system. Temperature will expand or contract the mechanical assembly, but will also
affect the field strength of the magnet and the distance from BOP t BRP of the Hall IC. The Neodymium
sample magnets used in this kit have a temperature coefficient of -).1098%/0C. This means that as tem-
perature increases by one degree Celsius, the Flux Density will decrease by 0.1098%.
Graph 5, Effects of Temperature on Flux Density
Due to the temperature coefficient, the magnet will have a difference in flux density of 30% and a change
in activation distance of 1mm over this range of temperature. This may not appear tobe a significant dif-
ference in field strength or distance, but in conjunction with other mechanical factors, temperature could
become a factor.
Design Example 2: Now that Design Example 1 illustrated the effects of mechanical, magnetic and Hall
IC tolerances within a Hall Effect System. Design Example 2 illustrates how they produce tolerance
buildup.
Tolerances:
Air Gap Tolerance = 2mm +0.5mm
US5881EUA BOP/BRP Range = 90G min. BRP to 300G max. BOP
(IC Temperature Selection (EUA) = -40oC to 85oC)
Temperature Range =-40oC to 85oC
Magnet Temp. Coefficient = -0.1098%/oC
700
600
500
400
300
200
100
600
500
400
300
200
100
0
0
0
0
Distance (mm)
2
5
4
Distance mm
Always "ON"
6
10
8
Always "ON"
Air Gap = 2 mm
Air Gap = 3 mm
Air Gap = 4 mm
Flux Denisity @ 25C
Flux Denisity @ -40C
Flux Denisity @ 85C
Always "OFF"
10
15
Always "OFF"
12
20
3-31
Section 3 - Applications