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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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    Is the code running at all? Do you use an external 32 khz crystal? The examples use this and if you don't have it, the code will be stuck in sd_softdevice_enable(...) waiting for the crystal to start. If you don't have external clock change the softdevice init call to this:

    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_4000MS_CALIBRATION, NULL);

    I see some minor faults in the antenna design since you have not followed the reference design, but these should only degrade antenna performance, dont make it not work.

    You may also want to change the pin definitions to match your custom board. Make a new file called custom_board.h with your pin definitions and change preprocessor definition BOARD_PCA10028 to BOARD_CUSTOM (see pca10028.h for how it is done for the DK).

    Could you give us some more information like how the application is failing and maybe include the schematic and layout files in the post?

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  • 0

    Is the code running at all? Do you use an external 32 khz crystal? The examples use this and if you don't have it, the code will be stuck in sd_softdevice_enable(...) waiting for the crystal to start. If you don't have external clock change the softdevice init call to this:

    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_4000MS_CALIBRATION, NULL);

    I see some minor faults in the antenna design since you have not followed the reference design, but these should only degrade antenna performance, dont make it not work.

    You may also want to change the pin definitions to match your custom board. Make a new file called custom_board.h with your pin definitions and change preprocessor definition BOARD_PCA10028 to BOARD_CUSTOM (see pca10028.h for how it is done for the DK).

    Could you give us some more information like how the application is failing and maybe include the schematic and layout files in the post?

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