A1150 ALLEGRO [Allegro MicroSystems], A1150 Datasheet - Page 7

• Manufacturer Part Number: A1150
• Description: Chopper-Stabilized, Two Wire Hall-Effect Switches
• Manufacturer: ALLEGRO [Allegro MicroSystems]

A1150, A1152, A1153, A1155,
The A1150, A1152, A1155, and A1157 output, I
after the magnetic field at the Hall sensor IC exceeds the oper-
ate point threshold, B
below the release point threshold, B
high. This is shown in figure 1, panel A.
In the case of the reverse output polarity, as in the A1153, A1156,
and A1158, the device output switches high after the magnetic
Figure 1. Alternative switching behaviors are available in the A115x 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).
A1156, A1157, and A1158
(A) Hysteresis curve for A1150, A1152, A1155, and A1157
I+
0
B–
OP
. When the magnetic field is reduced to
B
HYS
RP
, the device output goes
B+
CC
I
I
, switches low
CC(H)
CC(L)
Functional Description
field at the Hall sensor IC exceeds the operate point threshold,
B
point threshold, B
The difference between the magnetic operate and release points
is called the hysteresis of the device, B
esis allows clean switching of the output even in the presence of
external mechanical vibration and electrical noise.
OP
. When the magnetic field is reduced to below the release
Chopper-Stabilized, Two Wire
(B) Hysteresis curve for A1153, A1156, and A1158
RP
I+
0
, the device output goes low (panel B).
B–
Hall-Effect Switches
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
B
HYS
HYS
. This built-in hyster-
B+
I
I
CC(H)
CC(L)
7