NRF8001 RDYN Held High

Question

Hi I have built a custom NRF8001 board and I'm debugging a problem. 
 The main microcontroller works fine (atmega32u4) but the RDYN line never goes low to start the setup process. Does anyone know where to start debugging this? I'm pretty sure my circuit is correct, one thing I was thinking was the capacitors for the crystals might be too large. I scoped the crystals and they are not running, I assume though that the NRF8001 turns these on and off as it pleases. Is there a time that the crystals should definitely be on so that I can scope them? 
 Thanks for the help in advance. 
 Cheers, 
 Matthew

David Edwin · Accepted Answer

Hi, 
 I assume that the nRF8001 is powered and you did a pin reset for the first time.
The nRF8001 will send the Device Stated Event and as a result the RDYN line will go low.
Your problem is that the RDYN does not go low. 
 I assume that you have followed the reference design as stated in the datasheet and in the downloads section of the nRF8001 ( www.nordicsemi.com/.../nRF8001 -> Downloads -> Reference layout files ) 
 The section on the 16 MHz crystal oscillator in the datasheet also contains some pointers 
 You can get a review of the schematic and layout done by contacting the support team at www.nordicsemi.com/.../Contact-Support-Team . Register in the mypage and open a new case in your mypage for the review.