US4881LSE Melexis Inc, US4881LSE Datasheet - Page 37
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US4881LSE
Manufacturer Part Number
US4881LSE
Description
IC HALL SW BIPO NORTH POLE SOT23
Manufacturer
Melexis Inc
Type
Bipolar Latchr
Specifications of US4881LSE
Sensing Range
6mT Trip, -6mT Release
Voltage - Supply
2.2 V ~ 18 V
Current - Supply
5mA
Current - Output (max)
50mA
Output Type
Digital, Open Drain
Operating Temperature
-40°C ~ 150°C
Package / Case
SOT-23
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Other names
US4881LSETR
Geartooth Sensor
Magnetic Geartooth Sensing
The need to sense speed and position of ferrous gears occurs in numerous industries. The ability to con-
vert the repetitive passing teeth to an electrical impulse has been sought for many decades. purely
mechanical systems have been used with the attendant issue of wear and failure limiting its use to low
speed and low duty cycle applications.
Hall-Effect geartooth sensing makes use of the Hall element to sense the variation in flux found in the air-
gap between a magnet and passing ferrous gearteeth. A modern approach is to convert the signal from the
Hall element to a digital value and then perform signal processing to create a digital output from that
effort. In the case of the Melexis geartooth sensing scheme each time the signal changes direction a
counter is reset. If the signal level changes beyond the preset magnitude from the positive or negative peak
the output level is changed. This creates a digital zero speed peak detection speed sensor. It is immune to
orientation requirements and cab follow the gear speed down to the cessation of motion. It will detect the
first edge of the next tooth after immediately after power on. The digital signal processing does introduce
an uncertainty from quantization that is greater at larger speeds. Extremely demanding timing require-
ments like those found in crank position sensors may suffer from the loss of accuracy at high speeds.
Figure 24 shows the Melexis MLX90217 geartooth sensor operation.
Figure 24, Geartooth Sensor
Section 3 - Applications
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