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A3230

Allegro MicroSystems
Part Number A3230
Manufacturer Allegro MicroSystems
Description Chopper-Stabilized Hall-Effect Bipolar Switch
Published May 1, 2007
Detailed Description A3230 Chopper-Stabilized Hall-Effect Bipolar Switch Features and Benefits ▪ Chopper stabilization ▫ Superior temperature...
Datasheet PDF File A3230 PDF File

A3230
A3230

Overview
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) Description The A3230 Hall-effect sensor is a temperature stable, stressresistant 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.
Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA) 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 www.
DataSheet4U.
com Continued on the next page… Not to scale Functional Block Diagram VCC Regulator To All Subcircuits Sample and Hold Dynamic Offset Cancellation Low-Pass Filter VOUT Amp Control Current Limit <1Ω GND 3230-DS, Rev.
2 A3230 Chopper-Stabilized Hall Effect Bipolar Switch for the L temperature range.
Two A3230 package styles provide Description (continued) diminished or removed, to ensure that the device switches, Alleg...


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