a1140euati-t Allegro MicroSystems, Inc., a1140euati-t Datasheet - Page 7

• Manufacturer Part Number: a1140euati-t
• Description: Sensitive Two-wire Chopper-stabilized Unipolar Hall Effect Switches
• Manufacturer: Allegro MicroSystems, Inc.

A1140, A1141,
A1142, and A1143
Operation
The output, I
after the magnetic field at the Hall sensor exceeds the operate
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 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).
CC
, of the A1140 and A1142 devices switch low
I+
0
OP
B–
. When the magnetic field is reduced to
(A) A1140, A1142
B
HYS
RP
, the device output goes
HYS
B+
. This built-
I
I
CC(H)
Functional Description
CC(L)
Sensitive Two-Wire Chopper-Stabilized
in hysteresis allows clean switching of the output even in the
presence of external mechanical vibration and electrical noise.
The A1141 and A1143 devices switch with opposite polarity for
similar B
A1142 (see figure 1).
Unipolar Hall Effect Switches
OP
and B
I+
0
RP
B–
values, in comparison to the A1140 and
(B) A1141, A1143
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
B
HYS
B+
I
I
CC(H)
CC(L)
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