3.7.2.4 Antenna Tuning Registers

The RF front-end registers shown in the following table are used by the antenna tuning. They are controlled by firmware during the power-up and the power-down phase of the TCMode, RXMode, TXMode and PollingMode and by the hardware state machine during the antenna tuning procedure.

Table 3-52. Antenna Tuning RF Front-End Registers

Register

Function

FESR.ANTS

Antenna saturated

FEEN1.ATEN

Antenna tuning enable

FEEN2.CPBIA

Cap array bias

FEAT.ANTN[3:0]

Antenna tuning capacitor array control of CTUNE(1)

FEANT.LVLC[3:0]

Antenna signal level control

FEALR.RNGE[1:0]

Range of the ANT_TUNE level detector

Note: A variable is available in the EEPROM for this register. The variable can be used for end-of-line calibration if the automatic antenna tuning is not used in the application.