3.4 Power Supply Requirements
In order to provide a good radio performance, a great attention must also be paid to the
power supply and a correct layout and shielding, especially when this power supply also
supplies possible sources of interference like oscillators or other digital circuits at the same
time. Digital switching is very fast and creates high frequency interferences.
A star-connected topology and at least a 10uF low-ESR tantalum or similar ceramic capacitor
is recommended to be added as close as possible to module, between the module supply pin
Vcc and GND, together with a low DC-resistance (<1
Ω
) EMI-suppressor, like a ferrit bead e.g.
multi layer suppressor type MLS0805-4S7-102 from Ferroxcube, series feed between the
board supply pin input and the output of the power supply rail.
The ripple on the 5V (±5%) power supply rail should be below 10mVp-p.
3.5 LMI Output Connection
Example of a learning status indication by LEDs at 2 channels mode with decoupled loads
during learning mode (the decoupling of the load is only necessary if status indication through
connected actors is not appropriate). Note: LMI is Active High during learning mode; OUT_0
and OUT_1 are open collector outputs (Active Low).
OUT_1
OUT_0
LMI
Figure 15: Example of LMI output connection
3.6 CE Approval Requirements
The modules bear the EC conformity marking CE and conforms to the R&TTE EU-directive on
radio equipment. The assembly conforms to the European and national requirements of
electromagnetic compatibility. The conformity has been proven and the according
documentation has been deposited at EnOcean.
The RCM modules can be operated
without notification and free of charge in the area of the European Union, in
Switzerland, in Cyprus, in Czech, in Estonia, in Hungary, in Latvia, in Lithuania, in
Malta, in Poland, in Romania and in Slovenia
. The following provisos apply:
©EnOcean GmbH
Page 17 of 20
RCM 152 User Manual V1.31
