A1143LUA-T【PDF 8/15 页】IC SWITCH HALL EFFECT UNI 3-SIP

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Sensitive Two-Wire Chopper-Stabilized

Unipolar Hall Effect Switches

A1140, A1142, and

A1143

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Functional Description

HYS

CC(H)

CC(L)

B+

I+

(A) A1140, A1142

HYS

CC(H)

CC(L)

B+

I+

(B) A1143

Operation

The output, I

, of the A1140 and A1142 devices switch low

after the magnetic field at the Hall element exceeds the oper-

ate point threshold, B

. When the magnetic field is reduced to

below the release point threshold, B

, the device output goes

high. The differences between the magnetic operate and release

point is called the hysteresis of the device, B

HYS

. This built-in

hysteresis allows clean switching of the output even in the pres-

ence of external mechanical vibration and electrical noise. The

A1143 device switches with opposite polarity for similar B

and B

values, in comparison to the A1140 and A1142 (see

figure 1).

Figure 1. Alternative switching behaviors are available in the A114x device family. On the horizontal axis, the B+ direction indicates

increasing south polarity magnetic field strength, and the B direction indicates decreasing south polarity field strength (including the

case of increasing north polarity).

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