nRF52840 USB Interface Circuit

In my design, I choose to use the circuit suggested in Config no.5, but the USB interface is not effectively identified in the actual test. Through the test, the power supply of 5.0V can be measured on the VBUS pin (referred to as the USB interface), but there is no voltage measured on the DECUSB pin. Through the block diagram provided in the datasheet, I have eliminated the SMT quality problem by X-RAY, is there any problem that I did not consider during the debugging process or is there a problem with my schematic diagram?

PS:

1.At present, the board can burn the program normally, and the peripherals can also be controlled.

2.USB Demo selected the official course, the routine can run normally on the DK board .

Nordic Config no.5 Circuit

My design

Chip X-RAY

Parents Reply
  • Hi Priuamka

    I think I have found the problem. In the first PCB, there may be a welding quality problem. In the second PCB, it was confirmed by X-ray that the welding was reliable. After modifying the code, it was found that the external 32.768Khz crystal oscillator did not work well. Later I welded a PCB again to verify this conjecture.

    At the same time, it is regrettable to find that my nRF21540 cannot work normally, I wonder if you can provide technical support for this?

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