A3230_06 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – Chopper-Stabilized Hall-Effect Bipolar Switch

A3230
Chopper-Stabilized Hall-Effect Bipolar Switch
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 A3230 Hall-effect sensor is a temperature stable, stress-
resistant bipolar switch. This sensor is the most sensitive
Hall-effect device in the Allegro^® bipolar switch family and
is intended for ring-magnet sensing. 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.
The A3230 includes the following on a single silicon chip:
a 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 takes advantage of low-voltage
requirements, component matching, very low input-offset
errors, and small component geometries.
The A3230 Hall-effect bipolar switch turns on in a south
polarity magnetic field of sufficient strength and switches
off in a north polarity magnetic field of sufficient strength.
Because the output state is not defined if the magnetic field is
Not to scale
Continued on the next page…
Functional Block Diagram
VCC
Amp
Regulator
To All Subcircuits
Control
Current Limit
VOUT
<1Ω
GND
3230-DS, Rev. 2