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US4881 参数 Datasheet PDF下载

US4881图片预览
型号: US4881
PDF下载: 下载PDF文件 查看货源
内容描述: 双极霍尔开关低压&非常高的灵敏度 [Bipolar Hall Switch Low Voltage & Very High Sensitivity]
分类和应用: 开关
文件页数/大小: 11 页 / 442 K
品牌: MELEXIS [ Melexis Microelectronic Systems ]
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US4881  
Bipolar Hall Switch  
Low Voltage & Very High Sensitivity  
9 Detailed General Description  
Based on mixed signal CMOS technology, Melexis US4881 is a Hall-effect device with very high magnetic  
sensitivity. It allows using generic magnets, weak magnets or larger air gap.  
The chopper-stabilized amplifier uses switched capacitor techniques to suppress the offset generally  
observed with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible  
and contributes to smaller chip size and lower current consumption than bipolar technology. The small chip  
size is also an important factor to minimize the effect of physical stress.  
This combination results in more stable magnetic characteristics and enables faster and more precise design.  
The operating voltage from 2.2V to 18V, low current consumption and large choice of operating temperature  
range according to “L”, “K” and “E” specification make this device suitable for automotive, industrial and  
consumer low voltage applications.  
The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using  
a pull-up resistor tied between a pull-up voltage and the device output.  
10 Unique Features  
The US4881 exhibits bipolar magnetic switching characteristics. Therefore, it operates with both south and  
north poles.  
Typically, the device behaves as a latch with symmetric  
operating and release switching points (BOP=|BRP|). This means  
magnetic fields with equivalent strength and opposite direction  
drive the output high and low.  
Removing the magnetic field (B0) keeps the output in its  
previous state. This latching property defines the device as a  
magnetic memory.  
Latch characteristic  
Depending on the magnetic switching points, the device may also behave as a unipolar positive switch (BOP  
and BRP strictly positive) or negative switch (BOP and BRP strictly negative). That is the output can be set high  
and low by only using one magnetic pole. In such case, removing the magnetic field changes the output level.  
Unipolar positive switch characteristic  
Unipolar negative switch characteristic  
In latch, positive or negative switch behaviour, a magnetic hysteresis BHYST keeps BOP and BRP separated by  
a minimal value. This hysteresis prevents output oscillation near the switching point.  
3901004881  
Rev 011  
Page 5 of 11  
Data Sheet  
Feb/06