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nRF51822 bonding failed

Yi Su

Hi,

I have a custom board with nRF51822 chip on it and tried to run the proximity sample program on it. I have used the nRF51822 develpment board + nRFgo Motherboard to tested my code and everything worked fine. BTW I am using SDK version 4 and softdevice s110_nrf51822_5.2.1. After that, I downloaded the same code to the custom board, it was broadcasting ok, I could see it from the proximity demo program, but when I tried to connect it, it showed: bonding... bonding failed. I attached the schematic and the screenshot of bonding failure error below. Can anybody help me figure out the problem? Thanks!

q2.png

q3.png

log after change crystal.txt

log before change crystal.txt

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    Thank you for the quick response. After I posted this question, I found an older post with the same problem and he solved the problem. According to your answer in that post, I noticed the load capacitance for both crystal are not proper. I use 425F35B016M0000(CTX804CT-ND) for 16MHz crystal and ABS07-32.768KHz-T(535-9542-1-ND) for 32kHz crystal. I calculated the right load capacitance should be: 22pF for 16MHz and 21pF for 32kHz. But I need to order those capacitors so I tried first with replace the 16MHz crystal with one in the development board. But it still couldn't bond. Now I don't know if it is the same problem with the older post.

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  • 0

    Thank you for the quick response. After I posted this question, I found an older post with the same problem and he solved the problem. According to your answer in that post, I noticed the load capacitance for both crystal are not proper. I use 425F35B016M0000(CTX804CT-ND) for 16MHz crystal and ABS07-32.768KHz-T(535-9542-1-ND) for 32kHz crystal. I calculated the right load capacitance should be: 22pF for 16MHz and 21pF for 32kHz. But I need to order those capacitors so I tried first with replace the 16MHz crystal with one in the development board. But it still couldn't bond. Now I don't know if it is the same problem with the older post.

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