nrf52840 can't find the broadcast signal on cell phone

[raintoo]

Download the softdevice and example code， can't find bluetooth name  on phone,the code download the nrf52840 PDK can find bluetooth name，two boards debug information is the same.Download the softdevice and example code， can't find bluetooth name  on phone,the code download the nrf52840 PDK can find bluetooth name，two boards debug information is the same.Don't know what the problem is.

[ketiljo]

What's the CL value of the 32 MHz crystal you're using? The value of the load caps must be set according to the CL value. The formula is Ccap = 2 * CL - Cpin, where Cpin is 4 pF. 

For a 8 pF crystal, the load caps should be 12 pF each. Also check that the tolerance (stability and temperature) is less than 40 ppm.

[raintoo]

NOW, The problem was solved. I refered to nrf52840 PDK V0.9.0. This version schematic has a bug that has Two identical Designator  Pins DEC2 (A18&E24 ). E24 was the Pin DEC6  in fact ,and must be connected to  Pin B5(DEC4) ,because E24 was radio supply.   I've had a headache for a week because of this problem. THX

[ketiljo]

Good that you solved this. This isn't because of a bug but a change in the design of the IC from the preview version to the production version. 

[raintoo]

Yep, I'm not described it right. The Preview versions IC were connected internally.