A1126 查看數據表（PDF） - Allegro MicroSystems
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A1126 Datasheet PDF : 14 Pages
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A1126
Chopper-Stabilized Omnipolar Hall-Effect Switch
Functional Description
The output of these devices switches low (turns on) when a
magnetic field perpendicular to the Hall sensor chip exceeds the
operate point threshold, BOPx . After turn-on, the output voltage
is VOUT(SAT) . The output transistor is capable of sinking current
up to the short circuit current limit, IOM , which is a minimum
of 30 mA. When the magnetic field is reduced below the release
point, BRPx , the device output goes high (turns off). The differ-
ence in the magnetic operate and release points is the hysteresis,
BHYS , of the device. This built-in hysteresis allows clean switch-
ing of the output even in the presence of external mechanical
vibration and electrical noise.
In the case of omnipolar switch devices, removal of the magnetic
field results in the device output high (off).
Powering-on the device in the hysteresis range (less than BOPx
and greater than BRPx ) will allow an indeterminate output state.
The correct state is attained after the first excursion beyond BOPx
or BRPx .
V+
VS
0
B–
0
VOUT(SAT)
B+
BHYS
BHYS
Figure 1. Switching behavior of omnipolar switches. On the horizontal axis, the
B+ direction indicates increasing south polarity magnetic field strength, and the
B– direction indicates increasing north polarity. This behavior can be exhibited
when using a circuit such as that shown in figure 2.
Allegro MicroSystems, LLC
9
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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