Testing MIPI RFFE interface

nRF9160 offers an MIPI serial bus for external devices. The MIPI RF Front-End Control Interface (RFFE) contains a digital serial bus (SCLK and SDATA) and 1.8 V output (VIO). VIO is enabled when the modem is active and switched off when not needed. VIO output voltage can be measured when MIPI RFFE is active.

The MIPI RFFE interface is indirectly tested during RF functionality testing when the test cases cover all functional states of the external MIPI device.