Reserved Pins (Rsvd); Module Placement - u-blox TOBY-L4 Series System Integration Manual

2.11 Reserved pins (RSVD)

TOBY-L4 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 illustrated in Figure 67:

the RSVD pin number 6 that must be externally connected to ground
TOBY-L4 series
RSVD
6
RSVD
Figure 67: Application circuit for the reserved pins (RSVD)

2.12 Module placement

An optimized placement allows a minimum RF line's length and a closer path from the 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
electromagnetic interference that affects the module, analog parts and RF circuits' performance. Implement
suitable countermeasures to avoid any possible electromagnetic compatibility issues.
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 electromagnetic interference, or employ
countermeasures to avoid any possible electromagnetic 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-L4 series modules: avoid placing temperature
sensitive devices close to the module.
UBX-16024839 - R04
TOBY-L4 series - System Integration Manual
Design-in
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