US2881EUA Melexis Inc, US2881EUA Datasheet - Page 5

• Manufacturer Part Number: US2881EUA
• Description: IC LATCH CMOS H-SEN TO-92UA
• Manufacturer: Melexis Inc
• Type: Bipolar Latchr

Specifications of US2881EUA

• Sensing Range: 4.5mT Trip, -4.5mT Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 5mA
• Current - Output (max): 50mA
• Output Type: Digital, Open Drain
• Operating Temperature: -40°C ~ 85°C
• Package / Case: TO-92UA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US2881 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 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 BLDC motor 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 US2881 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
and low by only using 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 output oscillation near the switching point.
3901002881
Rev 012
RP
strictly positive) or negative switch (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.
OP
Bipolar Hall Switch – Very High Sensitivity
Page 5 of 12
and B
RP
strictly negative). That is the output can be set high
Unipolar negative switch characteristic
HYST
keeps B
OP
OP
and B
=|B
US2881
RP
RP
|). This means
separated by
Data Sheet
Aug/06
OP