A1186 Allegro MicroSystems, A1186 Datasheet - Page 6

• Manufacturer Part Number: A1186
• Description: (A1185 / A1186) Unipolar Hall-Effect Switches
• Manufacturer: Allegro MicroSystems

Operation
The output, I
field at the Hall sensor exceeds the operate point threshold, B
When the magnetic field is reduced to below the release point
threshold, B
between the magnetic operate and release point is called the
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).
A1185-DS, Rev. 1
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
RP
CC
, the device output goes high. The differences
, of the A1185 switches low after the magnetic
I+
0
B–
(A) A1185
B
HYS
B+
I
I
A1185 and A1186
CC(H)
Functional Description
CC(L)
OP
.
hysteresis of the device, B
clean switching of the output even in the presence of external
mechanical vibration and electrical noise. The A1186 device
switches with opposite polarity for similar B
in comparison to the A1185 (see figure 1).
I+
0
B–
HYS
(B) A1186
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
. This built-in hysteresis allows
B
HYS
OP
B+
and B
I
I
CC(H)
CC(L)
RP
values,
6