nRF51822 BLE part is not working. Rest of the things are working like timers, GPIO etc.

[vishal]

Above image is our design for nRF51822. Design also contains Accelerometer and WiFi (ESP8266).

My problem is, I am not able to see nRF BLE advertisement while scanning from mobile. Rest of the things are working like timers, GPIO etc. Software which we are using is already working.

We have performed few experiments, following are the observations. I tried 3 software combinations.

1. Softdevice and led sample test software. Worked well.
2. Softdevice and bootloader and application ... Control staying in bootloader. Not jumping to application. 3 softdevice and application... Application is running but BLE advertisement not able to see while scanning from mobile.

Can you please help us in solving this issue?? How to make BLE part working??

[Jørn]

Do you have a picture of the schematic for the 16MHz crystal? Pictures of the Layout surrounding the nRF51, especially of the RF part would also be helpful.

I also see you have used the BAL-NRF02D3 from ST. This balun is meant for the CEAA, CDAB and CFAC variants (See the balun product specification), which has a WLCSP package. Due to the differences between the WLCSP and QFN package there are different requirements for the RF matching network. Using the wrong balun will cause mismatch, which again causes loss. The 2450BM14E0003 from Johanson is meant for the QFN package type.