Programmable, Chopper-Stabilized,

Two-Wire Hall-Effect Switches

A119x and A119x-F

9

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

FUNCTIONAL DESCRIPTION

B+

B–

I+

0

(A) Hysteresis curve for A1190, A1192, and A1192-F

B+

I+

B–

0

(B) Hysteresis curve for A1193 and A1193-F

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).

the magnetic field at the Hall sensor IC exceeds the operate point

shown in figure 1, panel A.

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

A1193-F, the device output switches high after the magnetic field

When the magnetic field is reduced to below the release point

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.