A3230LUA-T【PDF 9/14 页】IC SW HALL EFFECT CHOPPER 3-SIP

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Chopper-Stabilized Hall Effect Bipolar Switch

A3230

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

exhibiting negative switch behavior operate in a similar but

opposite manner. A north polarity eld of suf cient strength,

> B

, (more north than B

) is required for operation, although

the result is that V

OUT

switches high, as shown in panel C. When

the eld is reduced beyond the B

level, the device switches

back to the low state.

The A3230 is designed to attain a small hysteresis, and thereby

provide more sensitive switching. Although this means that

true latching behavior cannot be guaranteed in all cases, proper

switching can be ensured by use of both south and north mag-

netic elds, as in a ring magnet.

Bipolar devices adopt an indeterminate output state when

powered-on in the absence of a magnetic eld or in a eld that

lies within the hysteresis band of the device. The correct state is

attained after the rst excursion beyond B

or B

For more information on Bipolar switches, refer to Application

Note 27705, Understanding Bipolar Hall Effect Sensor ICs.

Applications

It is strongly recommended that an external bypass capacitor be

connected (in close proximity to the Hall element) between the

supply and ground of the device to reduce both external noise

and noise generated by the chopper stabilization technique. As is

shown in Panel B of gure 1, a 0.1糉 capacitor is typical.

Extensive applications information on magnets and Hall-effect

devices is available in:

" Hall-Effect IC Applications Guide, AN27701,

" Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead

Welding and Lead Forming, AN27703.1

" Soldering Methods for Allegros Products SMT and Through-

Hole, AN26009

All are provided in Allegro Electronic Data Book, AMS-702 and

the Allegro Web site: www.allegromicro.com

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