US5781 데이터 시트보기 (PDF) - Melexis Microelectronic Systems
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US5781 Datasheet PDF : 11 Pages
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US5781
Unipolar Hall Switch – Medium Sensitivity
9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US5781 is a Hall-effect device with medium magnetic
sensitivity. Its sensitivity enables high accuracy in position sensing by the use of small air gap.
The chopper-stabilized amplifier uses switched capacitor technique 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 wide operating voltage from 3.5V to 24V, “L” and “E” operating temperature range and low current
consumption make this device especially suitable for automotive and solid state switch 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 US5781 exhibits unipolar magnetic switching characteristics. Therefore, it operates only with one
magnetic pole.
The UA package is south pole active:
Applying a south magnetic pole greater than BOP facing the
branded side of the package switches the output low.
The SE package is north pole active:
Applying a north magnetic pole greater than BOP facing the
branded side of the package switches the output low.
Unipolar switch characteristic
Removing the magnetic field (B→0) switches the output high.
The use of the opposite magnetic pole facing the branded side
does not affect the output state.
A magnetic hysteresis BHYST keeps BOP and BRP separated by a minimal value. This hysteresis prevents
output oscillation near the switching point.
3901005781
Rev 014
Page 5 of 11
Data Sheet
Mar/12
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