User's Manual

TOBY-R2 series - System Integration Manual
UBX-16010572 - R04 Design-in
Page 118 of 147
2.9 Reserved pins (RSVD)
TOBY-R2 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 the following RSVD pins as described in Figure 66:
 the RSVD pin number 6 that must be externally connected to ground
 the RSVD pin number 18 that is recommended to be connected to a Test-Point for diagnostic access
 the RSVD pin number 19 that is recommended to be connected to a Test-Point for diagnostic access
TOBY-R2 series
RSVD
6
RSVD
Test-Point
18
RSVD
19
RSVD
Test-Point
Figure 66: Application circuit for the reserved pins (RSVD)
2.10 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 proper
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.
Provide enough clearance between the module and any external part.
The heat dissipation during continuous transmission at maximum power can significantly raise the
temperature of the application base-board below the TOBY-R2 series modules: avoid placing temperature
sensitive devices close to the module.