The COEX interface consists of pins 91–93. It is dedicated for RF interference avoidance towards a companion radio device, such as an external positioning device or Bluetooth® Low Energy device.

The COEX interface is powered from VDD_GPIO. To control the COEX interface, the LTE modem must be active. When the LTE modem is not active, the COEX interface floats. Therefore, it is mandatory to use external pull-down resistors in the size range of 100 kΩ in the COEX interface.

The COEX pins have the following functionalities: