LTE modem coexistence interface

The LTE modem uses a dedicated three-pin interface for RF interference avoidance towards a companion radio device such as an external positioning device or Bluetooth® Low Energy device.

The inputs and outputs for this interface are the following:

Note: Using the COEX2 pin requires an external pull-down resistor in the 100 kΩ size range.
Note: For information on COEX signaling feature support, see the nRF9160 Modem Firmware Release Notes included in the latest nRF9160 modem firmware.
The COEX interface timing in relation to modem state is shown in the following figure.
Figure 1. COEX interface timing
COEX interface timing