A1145EUATI ALLEGRO [Allegro MicroSystems], A1145EUATI Datasheet - Page 7

• Manufacturer Part Number: A1145EUATI
• Description: Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
• Manufacturer: ALLEGRO [Allegro MicroSystems]

Operation
The output, I
netic field at the Hall sensor exceeds the operate point threshold,
B
point threshold, B
ences between the magnetic operate and release point is called
the hysteresis of the device, B
Figure 1. Alternative switching behaviors are available in the A114x 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).
A1145-DS, Rev. 6
OP
. When the magnetic field is reduced to below the release
Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
CC
, of the A1145 device switches low after the mag-
I+
0
RP
B–
, the device output goes high. The differ-
(A) A1145
HYS
B
HYS
. This built-in hysteresis allows
B+
I
I
A1145 and A1146
CC(H)
Functional Description
CC(L)
clean switching of the output even in the presence of external
mechanical vibration and electrical noise. The A1146 device
switches with opposite polarity for similar B
in comparison to the A1145 (see figure 1).
I+
0
B–
(B) A1146
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
B
HYS
OP
B+
and B
I
I
CC(H)
CC(L)
RP
values,
7