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A1185-DS, Rev. 1

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches

A1185 and A1186

Functional Description

B+

B–

I+

0

(A) A1185

B+

I+

B–

0

(B) A1186

When the magnetic field is reduced to below the release point

between the magnetic operate and release point is called the

clean switching of the output even in the presence of external

mechanical vibration and electrical noise. The A1186 device

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