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Chopper-Stabilized Omnipolar Hall Effect Switches
A3245
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Functional Description
B
HYS
B
HYS
V
S
V
OUT(SAT)
B+
B
V+
0
0
VCC
V
S
Output
GND
VOUT
R
LOAD
A3245
0.1 礔
C
BYP
Operation
The output of this device switches low (turns on) when a mag-
netic  eld perpendicular to the Hall element exceeds the oper-
ate point, B
OPS
 (or is less than B
OPN
). After turn-on, the output
voltage is V
OUT(SAT)
. The output transistor is capable of sink-
ing current up to the short circuit current limit, I
OM
, which is a
minimum of 30 mA. When the magnetic  eld is reduced below
the release point, B
RPS
 (or increased above B
RPN
), the device
output switches high (turns off). 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 a hysteresis region, between B
OPX
 
and B
RPX
, allows an indeterminate output state. The correct state
is attained after the  rst excursion beyond B
OPX
 or B
RPX
.
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.
Omnipolar switches allow operation with either a north pole or
south pole magnet orientation, enhancing product manufactur-
ability with the device.
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 Omnipolar Switches. 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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