US3881 Melexis Company, US3881 Datasheet - Page 5

• Manufacturer Part Number: US3881
• Description: Hall Latch ? Low Voltage & High Sensitivity
• Manufacturer: Melexis Company

9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US3881 is a Hall-effect device with high magnetic
sensitivity. This multi-purpose latch suits most of the application requirements.
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 US3881 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north
poles to operate properly.
The device behaves as a latch with symmetric operating and release switching points (B
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.
A magnetic hysteresis B
output oscillation near the switching point.
3901003881
Rev 014
SE package - Latch characteristic
HYST
keeps B
OP
and B
RP
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separated by a minimal value. This hysteresis prevents
Low Voltage & High Sensitivity
UA package - Latch characteristic
OP
US3881
=|B
RP
Hall Latch
Data Sheet
Feb/06
|). This