14.4.3.4 TX Output Power
The maximum output power of the transmitter is typically +5dBm in normal mode and +11dBm in boost mode. The TX output power can be set via the TX_PWR bits in the PHY_TX_PWR register (PHY_TX_PWR.TX_PWR). The output power of the transmitter can be controlled down to -25dBm with 1dB resolution.
To meet the spectral requirements of the European and Chinese bands, it is necessary to limit the TX power by appropriate setting of the TX_PWR and GC_PA bits in the PHY_TX_PWR register (PHY_TX_PWR.TX_PWR and PHY_TX_PWR.GC_PA), and the GC_TX_OFFS bits in the RF_CTRL_0 register (RF_CTRL_0.GC_TX_OFFS)..