Chopper-Stabilized Hall Effect Latch
A3282
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Description
B
HYS
V
CC
V
OUT(SAT)
B+
B
V+
0
0
VCC
V
S
Output
GND
VOUT
R
LOAD
A3282
0.1 礔
C
BYP
Operation
The output of these devices switches low (turns on) when a
magnetic eld perpendicular to the Hall element exceeds the
operate point threshold, B
OP
. After turn-on, the output voltage
is V
OUT(SAT)
. The output transistor is capable of sinking current
up to the short circuit current limit, I
OM
, which is a minimum of
30 mA. Note that the device latches, that is, a south pole of suf -
cient strength towards the branded surface of the device turns the
device on. The device remains on if the south pole is removed.
When the magnetic eld is reduced below the release point, B
RP
,
the device output turns off (goes high). The difference in the
magnetic operate and release points is the hysteresis, B
HYS
, of
the device. This built-in hysteresis allows clean switching of the
output even in the presence of external mechanical vibration and
electrical noise.
Powering-on the device in the hysteresis region (less than B
OP
and
higher than B
RP
) allows an indeterminate output state. The correct
state is attained after the rst excursion beyond B
OP
or B
RP
.
Applications
It is strongly recommended that an external bypass capacitor be
connected (in close proximity to the Hall element) between the
supply and ground of the device to reduce both external noise
and noise generated by the chopper stabilization technique. As is
shown in Panel B of gure 1, a 0.1糉 capacitor is typical.
Extensive applications information on magnets and Hall-effect
devices is available in:
" Hall-Effect IC Applications Guide, AN27701,
" Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead
Welding and Lead Forming, AN27703.1
" Soldering Methods for Allegros Products SMT and Through-
Hole, AN26009
All are provided in Allegro Electronic Data Book, AMS-702 and
the Allegro Web site: www.allegromicro.com
Figure 1: Switching Behavior of Latches. In Panel A, on the horizontal axis, the B+ direction indicates increasing south polarity magnetic
eld strength, and the B direction indicates decreasing south polarity eld strength (including the case of increasing north polarity). This
behavior can be exhibited when using a circuit such as that shown in panel B.
(A)
(B)
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