Hall
Effect devices are temperature-compensated magnetic field sensing
products. They are best suited for extremely harsh environments
for sensing motion such as under-the-hood automotive and heavy
industrial machinery applications, including robotics where identification
of objects and or counting rotations of gears is required.
The basic Hall element relies on a magnetic field in order to sense motion.
The principle is based on the Hall effect, discovered more than 100 years
ago by Edwin Herbert Hall. This effect is the small electrical potential
created when a stationary magnetic field is placed perpendicular to a
current-carrying conductor.
Some
of the advantages of the OPTEK Hall Effect device are:
- Bandgap
Voltage Regulator - In addition to maintaining a constant
output voltage level, the Hallogic bandgap voltage regulator
serves as temperature compensated voltage source to bias
the Hall cell with the supply voltage ranging from 4.5 to
24.0 volts DC.
- Threshold
Amplifier – The amplifier/detector circuit is
a constant-gain configuration, designed with temperature-compensated
trip
points at the input to the voltage comparator. The
Schmitt trigger output then drives an open-collector
transistor with
a 30mA current sinking capability. This open-collector
transistor enables the device output to drive up to
10 TTL loads directly.
- Low
Power Consumption – No bias current is required
by the permanent magnet. The sensor itself draws typically
5mA
of supply current.
- Designed
for the toughest environments – The Hall Effect Sensor
is virtually immune to environmental contaminants. It’s
rugged and suitable for use under severe conditions.
These devices are excellent choice for DC motors, automotive
applications,
robotic and heavy machinery sensing applications, or
for any application in a harsh environment where optoelectronic
devices are suitable.
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