SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 96 of 128
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2.10 Reserved pins (RSVD)
SARA-R4 series modules have pins reserved for future use, marked as RSVD.
All the RSVD pins are to be left unconnected on the application board, except for the RSVD pin number
33 that can be externally connected to ground by 0 series jumper.
☞ It is highly recommended to provide accessible test point directly connected to the RSVD #33 pin
for diagnostic purpose (see Figure 60).
2.11 Module placement
An optimized placement allows a minimum RF line’s length and closer path from DC source for VCC.
Make sure that the module, analog parts and RF circuits are clearly separated from any possible
source of radiated energy. In particular, digital circuits can radiate digital frequency harmonics, which
can produce Electro-Magnetic Interference that affects the module, analog parts and RF circuits’
performance. Implement suitable countermeasures to avoid any possible Electro-Magnetic
Compatibility issue.
Make sure that the module, RF and analog parts / circuits, and high speed digital circuits are clearly
separated from any sensitive part / circuit which may be affected by Electro-Magnetic Interference,
or employ countermeasures to avoid any possible Electro-Magnetic Compatibility issue.
Make sure that the module is placed in order to keep the antenna as far as possible from VCC supply
line and related parts (refer to Figure 32), from high speed digital lines (as USB) and from any possible
noise source.
Provide enough clearance between the module and any external part: clearance of at least 0.4 mm per
side is recommended to let suitable mounting of the parts.
☞ The heat dissipation during continuous transmission at maximum power can significantly raise
the temperature of the application base-board below the SARA-R4 series modules: avoid placing
temperature sensitive devices close to the module.
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