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Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Description
B
HYS
I
CC(H)
I
CC(L)
B+
B
I+
0
(A) A1180 and A1182
B
HYS
I
CC(H)
I
CC(L)
B+
I+
B
0
(B) A1181 and A1183
Operation
The output, I
CC
, of the A1180 and A1182 devices switch low
after the magnetic  eld at the Hall element exceeds the oper-
ate point threshold, B
OP
. When the magnetic  eld is reduced to
below the release point threshold, B
RP
, the device output goes
high. The differences 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 A1181 and A1183 devices switch with opposite polarity for
similar B
OP
 and B
RP
 values, in comparison to the A1180 and
A1183 (see  gure 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  eld strength, and the B direction indicates decreasing south polarity  eld strength (including the
case of increasing north polarity).
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