Integration Manual

TSD-19090601 - R15 Contents Page 116 of 143
2.10.2 Guidelines for general purpose input/output layout design
The general purpose inputs / outputs pins are generally not critical for layout.
2.11 Reserved pins (RSVD)
TOBY-L3 series modules have pins reserved for future use, marked as RSVD. All the RSVD pins are to be
left unconnected on the application board.
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-L3 series modules: avoid placing
temperature sensitive devices close to the module.