A1186LUA-T【PDF 7/15 页】IC SWITCH HALL EFFECT UNI 3-SIP

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Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

A1185 and

A1186

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) A1185

HYS

CC(H)

CC(L)

B+

I+

(B) A1186

The output, I

, of the A1185 switches low after the magnetic

field at the Hall element exceeds the operate point threshold,

. When the magnetic field is reduced to below the release

point threshold, B

, the device output goes high. The differ-

ences 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 presence of external

mechanical vibration and electrical noise. The A1186 device

switches with opposite polarity for similar B

and B

values,

in comparison to the A1185 (see figure 1).

Figure 1. Alternative switching behaviors are available in the A118x 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).

Operation

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