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| 型号： | US1881LUA-AAA-000-BU |
| 厂商： | Melexis Technologies NV |
| 文件页数： | 37/46页 |
| 文件大小： | 498K |
| 描述： | IC LATCH CMOS MP TO-92UA |
| 产品目录绘图： | UA-92 Series Side |
| 标准包装： | 1,000 |
| 传感范围： | 9.5mT 跳闸，-9.5mT 释放 |
| 类型： | 双极卡锁 |
| 电源电压： | 3.5 V ~ 24 V |
| 电流 - 电源： | 5mA |
| 电流 - 输出（最大）： | 50mA |
| 输出类型： | 数字式，开漏极 |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | TO-226-3，TO-92-3 短体 |
| 供应商设备封装： | TO-92UA |
| 包装： | 散装 |
| 产品目录页面： | 2792 (CN2011-ZH PDF) |
| 其它名称： | US1881LUA US1881LUA-ND |
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3-23
Section 3 - Applications
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
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