LTE modem RF control external interface

LTE modem provides dedicated 1.8 V digital interfaces for controlling external RF applications, such as antenna tuner devices:

LTE modem drives these outputs timing accurately according to LTE protocol timing to set e.g. the correct antenna tuner settings per used frequency. User needs to inform the LTE modem through the modem API about the particular RF application e.g. antenna tuner device configuration, so that LTE modem knows how to drive it.

Note: For details regarding the modem API and supported RF external control features, please refer to nRF91 AT Commands, Command Reference Guide document.
Note: MIPI RFFE capacitive load at SCLK or SDATA pins shall not exceed 15 pF.
MIPI RFFE interface timing in relation to modem state is shown in the figure below.
Figure 1. MIPI RFFE interface timing
MIPI RFFE interface timing

MAGPIO interface timing in relation to modem state is shown in the figure below.
Figure 2. MAGPIO interface timing
MAGPIO interface timing