A1146 Allegro MicroSystems, A1146 Datasheet - Page 6

• Manufacturer Part Number: A1146
• Description: (A1145 / A1146) Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
• Manufacturer: Allegro MicroSystems

A1145
A1146
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).
OP
. When the magnetic field is reduced to below the release
CC
and
, 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+
Ultrasensitive Two-Wire Chopper-Stabilized
I
I
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).
Unipolar Hall Effect Switches
I+
0
B–
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
(B) A1146
B
HYS
OP
B+
and B
I
I
CC(H)
CC(L)
RP
values,
6