A3282_06 Datasheet, PDF (1/11 Pages) Allegro MicroSystems – Chopper-Stabilized Hall Effect Latch

A3282
Chopper-Stabilized Hall-Effect Latch
Features and Benefits
▪ Chopper stabilization
▫ Superior temperature stability
▫ Extremely low switchpoint drift
▫ Insensitive to physical stress
▪ Reverse battery protection
▪ Output short circuit protection
▪ Solid state reliability
▪ Small size
▪ Robust EMC capability
▪ High ESD ratings (HBM)
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The A3282 Hall-effect sensor is a temperature stable, stress-
resistant latch. Superior high-temperature performance
is made possible through an Allegro^® patented dynamic
offset cancellation that utilizes chopper-stabilization. This
method reduces the offset voltage normally caused by device
overmolding, temperature dependencies, and thermal stress.
TheA3282 complements the currentAllegro family of chopper-
stabilized latching sensors.
The A3282 includes the following on a single silicon chip:
voltage regulator, Hall-voltage generator, small-signal
amplifier, chopper stabilization, Schmitt trigger, and a short
circuit protected open-drain output. Advanced BiCMOS wafer
fabrication processing is used to take advantage of low-voltage
requirements, component matching, very low input-offset
errors, and small component geometries.
This device requires the presence of both south and north
polarity magnetic fields for operation. In the presence of a
south polarity field of sufficient strength, the device output
latches on, and only switches off when a north polarity field
of sufficient strength is present.
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
GND
A3282-DS, Rev. 3