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:

  • MIPI RFFE interface pins – VIO, SCLK, and SDATA
    • Only one connected RFFE component supported at a time
  • MAGPIO[0..2] interface pins

The LTE modem drives the timing of these applications according to the LTE protocol. The LTE modem API must be used to inform the LTE modem about an external RF application, before the LTE modem can drive it.

Note: The MIPI RFFE capacitive load on the SCLK or SDATA pin must 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 the LTE modem state is shown in the following figure.
Figure 2. MAGPIO interface timing
MAGPIO interface timing