Datasheet

DATA SHEET
Technical changes reserved
0141 0316-75 30.03.2016
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 guarantees the fact that
the module complies with the requirements of European ETSI standard
and possesses a generally valid CE permission.
Radar based 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 out-
put 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, its material and its distance to the sensor.
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 applica-tions,
the PIR sensors and radar sensors are effectively combined.
The signal voltage at output of the mixer is still very low, in the maxi-
mum order of approx. 300 µV. Therefore, a subsequent amplier is
required with dened bandwidth (approx. 20 ... 900 Hz) which brings
the signal to a useful level, which can be then further evaluated over
a micro-controller. Application circuits for this are available on request,
alternatively modules with integrated ampliers are also available.
Handling recommendations
The sensor is susceptible to ESD danger due to wrong handling. How-
ever, the regular precautions for CMOS circuits are suf-
cient during handling of the component. Touching the
signal outputs should be avoided, before the module is
assembled on the circuit board.
The use of a multimeter for resistance measure-
ment between the connection pins can lead to da-
mage of the module.
The proximity of uorescent lamps can lead to incorrect triggering.
Hence, the module should not be installed in direct proximity of uo-
rescent lamps. This effect can be suppressed by introducing a 100 Hz
notch lter in the ensuing electronics.
Because of its type of construction, the module is sensitive to sound
impacts. Just mounting over the pins is not sufcient, the module
should also be mechanically further secured.
Pin Function
1 Operating voltage 4.75...5.25 V
2 Signal output
3 Ground
Connection
Antenna diagramm
Radar based motion detector module
RADAR-IPM-165
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
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