A1180EUA-T ALLEGRO [Allegro MicroSystems], A1180EUA-T Datasheet - Page 8

• Manufacturer Part Number: A1180EUA-T
• Description: Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
• Manufacturer: ALLEGRO [Allegro MicroSystems]

Operation
The output, I
after the magnetic fi eld at the Hall sensor exceeds the oper-
ate point threshold, B
below the release point threshold, B
high. The differences between the magnetic operate and release
point is called the hysteresis of the device, B
Figure 1. Alternative switching behaviors are available in the A118x device family. On the horizontal axis, the B+ direction indicates
increasing south polarity magnetic fi eld strength, and the B– direction indicates decreasing south polarity fi eld strength (including the
case of increasing north polarity).
A1180-DS, Rev. 2
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
CC
, of the A1180 and A1182 devices switch low
I+
0
B–
(A) A1180 and A1182
OP
. When the magnetic fi eld is reduced to
B
HYS
RP
, the device output goes
HYS
B+
. This built-
I
I
CC(H)
Functional Description
CC(L)
A1180/81/82/83
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
A1183 (see fi gure 1).
OP
and B
I+
0
RP
B–
values, in comparison to the A1180 and
(B) A1181 and A1183
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
B
HYS
B+
I
I
CC(H)
CC(L)
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