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US4881LUA Datasheet(PDF) 5 Page - Melexis Microelectronic Systems |
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US4881LUA Datasheet(HTML) 5 Page - Melexis Microelectronic Systems |
5 / 11 page US4881 Bipolar Hall Switch Low Voltage & Very High Sensitivity 3901004881 Page 5 of 11 Data Sheet Rev 011 Feb/06 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. Latch characteristic 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 (B→0) keeps the output in its previous state. This latching property defines the device as a magnetic memory. 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. |
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