A1180 datasheet(7/15 Pages) ALLEGRO

7 / 15 page

Sensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

A1180, A1181,

A1182, and A1183

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

Functional Description

BHYS

ICC(H)

ICC(L)

B+

B–

I+

(A) A1180 and A1182

BHYS

ICC(H)

ICC(L)

B+

I+

B–

(B) A1181 and A1183

Operation

The output, ICC, of the A1180 and A1182 devices switch low

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

ate point threshold, BOP. When the magnetic ﬁeld is reduced to

below the release point threshold, BRP, the device output goes

high. The differences between the magnetic operate and release

point is called the hysteresis of the device, BHYS. This built-

in hysteresis allows clean switching of the output even in the

presence of external mechanical vibration and electrical noise.

The A1181 and A1183 devices switch with opposite polarity for

similar BOP and BRP values, in comparison to the A1180 and

A1183 (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).

A1180 Datasheet(PDF) 7 Page - Allegro MicroSystems