LTE modem RF control external interface

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

The LTE modem supports the following pins:

The LTE modem drives these outputs timing accurately according to LTE protocol timing to set, for example, the correct antenna tuner settings per used frequency. The user needs to inform the LTE modem through the modem API about the particular RF application, such as 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, see nRF91 AT Commands.
Note: The MIPI RFFE capacitive load at SCLK or SDATA pins shall not exceed 15 pF.
The MIPI RFFE interface timing in relation to modem state is shown in the following figure.
Figure 1. MIPI RFFE interface timing
MIPI RFFE interface timing

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