Specifications

Sensors
Hall-effect sensors
www.digikey.com/maxim-industrial 83
Overview
Hall-effect sensors are widely used
in applications for status, position,
angular, and proximity detection
and for smart-sensing systems.
Since Hall-effect sensors detect a
magnetic field, they can operate in
harsh environmental conditions.
Their robustness and reliability are
important benefits derived from a
magnetic field.
Hall-effect sensors are used in motor
applications where the speed,
position, and direction of motors
can be sensed and communicated to
the system for real-time feedback. If
there is an interruption to the motor,
the sensor detects it so corrective
action can be taken.
Typically, to detect the direction
of movement, two Hall-effect
sensors are used. Maxim’s MAX9641*
combines two Hall-effect sensors
and digital logic to provide position
and direction outputs. As an addi-
tional help for detecting mechanical
movements, single and dual Hall-
effect switches can integrate a
Hall-effect sensor, an amplifier, and
an output stage. A Hall-effect switch
can, for example, be placed on a
stationary part and a magnet placed
in a mechanical moving arm. When
the arm aligns with the stationary
part, the Hall-effect switch detects
the position and forwards the infor-
mation to the microprocessor.
Hall-effect sensors improve robust-
ness and repeatability compared
to mechanical approaches. These
sensors provide better reliability than
photointerrupter-based systems
which are not reliable in dusty,
humid environments.
Hall-effect sensors
www.maxim-ic.com/detect
HALL
VOLTAGE
MAGNETIC FLUX
APPLIED
CURRENT
*Future product—contact factory for availability.