3.3 RF Front End Control

The antenna diversity signals ANT_DIV_P/N are used to control the diversity switch U4. The signal ANT_DIV_P is available at the IO ring pin 18 to indicate the antenna currently in use.

In addition at pin 17, the RX_TX indicator signal is available to indicate if the module is currently in transmit mode.

Table 3-4. RF Front End Control
RF Front End SignalMCU FunctionMCU PinPort and SERCOM Configuration
ANT_DIV_PFECTRL221

PA12; MUX=F; F3CFG=DIG1

Available at module pin 18

ANT_DIV_NFECTRL116PA09; MUX=F; F1CFG=DIG2
FEM_RX_TXFECTRL322

PA13; MUX=F;

F0CFG=DIG3 for High active TX indication

F0CFG=DIG4 for Low active TX indication

Available at module pin 17