What is COEXx use for?

[helen]

Hi

          What is COEXx use for，Is it necessary to reserve in product design?

[ketiljo]

Please see this: https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/coex_if.html

[helen]

Hi

         Sorry，I don't quite understand the application of these three pins in the product.

when the transceiver of ble or wif device on the board works, is it required to set the coex0 pin high to stop the  LTE modem?Can the transceiver of ble or wif device  not work simultaneously with LTE modem?

Will coex0 be automatically set high when GPS is receiving?

1、Under what circumstances does the product need to synchronize to the LTE system time.Could you describe an example of product application?

2、What is the GPS 1PPS (one pulse per second) time mark pulse use for?Could you describe an example of product application?

Could you describe an example of product application?

[ketiljo]

COEX0 can only be used to turn on an LNA whrn the GPS active, other functions are implemented yet. See https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Fsip_pin_configuration%2Fxcoex0.html

COEX2 can be used to output one pulse pr second with high accuracy. Most GPS modules have this and can be used for accurate timing applications. 

[helen]

Hi

     Thank you for reply.

Can't the transceiver of ble or wif device and LTE modem work at the same time?

[ketiljo]

The signal strength from the LTE transmitter is quite strong. So a band pass filter between the BLE radio and antenna may be needed. Else the BLE receiver may be blocked by the LTE transmitter. If not, there will be higher packet loss for the BLE connection.