Hi,
The definition of the COEX1 pin looks to be really interesting for applications that need a reliable time reference. A 1PPS GPS output is very useful; absolute accuracy is less important than consistency (so if the pulse takes 1ms to be output from the modem from the absolute fall of a second, that's OK as long as it always takes 1ms accross all devices). Similarly if the pulsed time signal is synchronous to the LTE stack instead then that can also be a very useful time reference, if it is consistent.
I understand from other devzone replies (a while ago) that the COEX1 pin is not yet implemented? When is this planned to be implemented and are there any more details on what its planned behaviour will be (in regards to the LTE-synchronous behaviour)?
Many thanks,
Stuart.