nRF51822 QFAA resets when connecting to it

[PabloGC]

As the title says, I'm having problems connecting to my device with my custom board and I don't know what else to do. This is my Layout:

Whenever I upload my firmware to the nRF Kit it works perfectly, the chip is able to receive the data and it doesn't disconnect. The behaviour that I'm observing while trying to connect with my custom board (Malapascua) is the next:

And this is with the nRF Kit:

So the dBms are more or less the same but still, I don't understand why my custom board is sometimes reseting or not responding at all whenever a device tries to connect to it. The only difference I see is that my custom board is using a nRF51822 QFAA and the Kit is using a nRF51422 QFAC.

Thank you, Pablo. 

[endnode]

HW problems like missing passive components or antenna stage problems should be the last. If you say what Soft Device you use we could have a look if chip version without AN is the problem but again it's unlikely that you would pass all the initialization up to the GAP Peripheral advertising and link establishment. Memory mapping again should cause failure earlier but who knows. In the end you will nee to debug the FW, guessing over the internet does work only in small percentage of cases;)

[MartinBL]

I suppose a sniffer trace could also be useful. You can use our sniffer solution and your nRF51 DK to sniff the packets from your custom board.

[Nguyen Hoan Hoang]

First thing to check, your chip (16KB) has less ram than the DK (32KB). Have you modify the ld script for the ram size of your chip ? Second a reset could be caused by a SDK returning an error code. Breakpoint in the error handler and back track stack to see where it happened.