Datasheet

DATA SHEET
Technical changes reserved
Drawing
Operation
The radar module comprises of a highly integrated radar sensor with
sending and receiving part as well as a push-pull mixer. Careful circuit
layout and selection of suitable components lead to the fact that the
module complies with the requirements of European ETSI standard
and possesses a generally valid CE permission.
Radar motion alarm units work as per the Doppler principle:
theelectromagneticwavesinthemicrowaverangearereected
from the object and superimposed over a sending signal by a mixer
in the module. Therefore, the frequency of signal originating at the
mixer output is proportional to the speed: 44 Hz corresponding to a
movement speed of approx. 1 km/h. The amplitude of the signal is an
outcome of the size of the object and its distance to the sensor.
The signal voltage at output of the mixer is still very low, in the maxi-
mumorderofapprox.300µV.Asubsequentamplierwithdened
bandwidth brings the signal to a useful level, which is then evaluated
over a window comparator.
While PIR sensors react very insensitively to movements in straight
direction, the radar sensor shows its highest sensitivity here. On the
other hand, radar sensors are more insensitive to circular movements
around the sensor, while the PIR sensors clearly possesses the high-
est sensitivity here. Therefore, in modern safety related applications,
the PIR sensors and radar sensors are effectively combined.
Application notes
Caution! Because of its construction, the radar sensor is ESD-
sensitive and should only be touched in unassembled condition with
relevantsafetymeasures.Theproximityofuorescentlampscan
lead to incorrect triggering. Hence, the module should not be installed
indirectproximityofuorescentlamps.
Settings
The sensitivity of the module to movement events is adjustable over
the potentiometer “SENSITIVITY”. Turning it in the clockwise direction
increases sensitivity.
Connection layout
Pin Colour Description Function
1 Black GND Ground, Reference potential
2 Brown OUT Open Collector output
4 Red VCC Operating voltage 8 ... 15V
Radiation pattern
Radar based motion
detector module
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