Functional Description

B+

B–

I+

0

(A) Hysteresis curve for A1190 and A1192

B+

I+

B–

0

(B) Hysteresis curve for A1193

Figure 1. Alternative switching behaviors are available in the A119x 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).

netic field at the Hall sensor IC exceeds the operate point thresh-

in figure 1, panel A.

In the case of the reverse output polarity, as in the A1193, the

device output switches high after the magnetic field at the Hall

magnetic field is reduced to below the release point threshold,

The difference between the magnetic operate and release points

esis allows clean switching of the output even in the presence of

external mechanical vibration and electrical noise.

Programmable, Chopper-Stabilized,

Two Wire Hall-Effect Switches

A1190, A1192,

and A1193

7

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com