NRF9160-SICA-R7 datasheet(363/400 Pages) NORDIC

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LTE modem

Note: COEX2 pin requires an external pull-down resistor in 100 kΩ size range to be used.

Note: Please refer to nRF9160 modem firmware release notes found under nRF91 FW binaries

downloads concerning availability of COEX signaling feature support".

COEX interface timing in relation to modem state is shown in the figure below.

Modem state

OFF

50-100 µs

e.g. LTE TX

e.g. LTE RX or GPS

Sleep/

PWROFF

Sleep/

PWROFF

Retuning

symbol

COEX2

COEX0

State x

State y

State z

time

1-2ms

Figure 110: COEX interface timing

7.4 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:

• MIPI RFFE interface pins: VIO, SCLK, SDATA.

• MAGPIO interface pins: MAGPIO0, MAGPIO1, MAGPIO2.

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.

4418_1315 v2.0

363

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