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NR51422 radio not detected

Darshan

Hi

I have an custom board which uses an nrf51422 SOC. I am facing issues with my radio.I use an softdevice s110 with an application on it.

The code just works fine with the nrf51422-DK where I can switch ON/OFF an LED using an phone app.

But with the same code on my custom board I am not able to detect device. The program is running I have debugged all the stages

I measured the voltages near the antenna components on both the boards and they are the same. with three pulses of 1.9V and after capacitor its analogue signals with three pulses.

Components ordered as per BOM of nrf51422-DK

Please find the custom board PCB antenna below

nrf51422_custom_PCB.png

shematic.JPG

16Mhz_abracon.pdf

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    You said that you used the DK BOM, but I see that you are using a through hole crystal. This may have different load capacitance and hence the capacitors need to be a different value. If these are the wrong value, the frequency of the crystal may be incorrect which will make the radio frequency incorrect. The accuracy of the crystal needs to be +-40 ppm for bluetooth low energy applications. What is the load capacitance (CL) and the accuracy of the crystal?

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  • 0

    You said that you used the DK BOM, but I see that you are using a through hole crystal. This may have different load capacitance and hence the capacitors need to be a different value. If these are the wrong value, the frequency of the crystal may be incorrect which will make the radio frequency incorrect. The accuracy of the crystal needs to be +-40 ppm for bluetooth low energy applications. What is the load capacitance (CL) and the accuracy of the crystal?

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