BLE disconnections with LFCLK synthesized

[Nicolas Brunner]

I'm using 2 nRF5340PDK with nRF Connect SDK 1.4.0. 1 PDK with central_uart and 1 PDK with peripheral_uart.

When I change the clock config of the peripheral_uart by using CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y or CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y, the BLE work correctly. But when i use CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=y, the BLE keep disconnecting after every ~4 seconds.

Is this a limitation of the LFCLK synthesized or a bug ?

[Hung Bui]

Hi Nicolas, 

Yes it's indeed a known issue with SDK v1.4.0. Please have a look here and look for issue DRGN-6362 in the list. 

[Nicolas Brunner]

Thank you for the information.