I purchased 5000 pieces of da14583 from Avnet for production. After welding, it was found that about 10% of the boards had no Bluetooth broadcasting signal output. The faulty boards could download and run firmware normally, but there was no radio frequency signal output. Through the oscilloscope, we could see the strange waveform shown by the attachment at the foot of the RFIOP, while the normal working boards had no such signal output. Reverse the da14583 on the normal and abnormal working boards, you can find that the problem is caused by da14583.
This problem occurs after the program has been burned down, not after a period of time.
Using routines in SDK, such as prox_reporter, is the same phenomenon.
Why does this happen? Looking forward to your reply, thank you!