US4881ESE Melexis Inc, US4881ESE Datasheet - Page 5

• Manufacturer Part Number: US4881ESE
• Description: IC HALL SW BIPO NORTH POLE SOT23
• Manufacturer: Melexis Inc
• Type: Bipolar Latchr

Specifications of US4881ESE

• Sensing Range: 6mT Trip, -6mT Release
• Voltage - Supply: 2.2 V ~ 18 V
• Current - Supply: 5mA
• Current - Output (max): 50mA
• Output Type: Digital, Open Drain
• Operating Temperature: -40°C ~ 85°C
• Package / Case: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Other names: US4881ESETR

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 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 when compared to the 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, “L”, “K” and “E” operating temperature ranges and low current
consumption make this device especially 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.
Depending on the magnetic switching points, the device may also behave as a unipolar positive switch (B
and B
is the output can be set high and low by using only one magnetic pole. In such case, removing the magnetic
field changes the output level.
In latch, positive or negative switch behaviour, a magnetic hysteresis B
a minimal value. This hysteresis prevents the output from oscillating near the switching point.
3901004881
Rev 012
RP
strictly positive) or unipolar negative switch with inversed output (B
Unipolar positive switch characteristic
Latch characteristic
Typically, the device behaves as a latch with symmetric
operating and release switching points (B
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.
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Low Voltage & Very High Sensitivity
Unipolar negative switch characteristic
HYST
keeps B
OP
and B
Bipolar Hall Switch
OP
RP
and B
OP
strictly negative). That
=|B
US4881
RP
RP
|). This means
separated by
Data Sheet
Jan/07
OP