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the circuit I designed doesn't work

my version.zipOfficial version.zipHello, I try to modify the official circuit of nRF52810 QCAA to test the chip(Offical version file attached below), and It work successfully. However when I copy the same circuit to my circuit and add some touching button and mpu6050, the chip doesn't work normally, and I can't even use jlink to program the software into the chip(but st-link can do that sometimes), other problem such as that TWI can't read data from mpu6050 and reading flash after writing will cause forever reset also occurs(I welded two PCBs, both have the same problem). These problem doesn't occurs in the official circuit but in my circuit version, could you please check my circuit and give me some advice to recover it, thank you very much!

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  • Hi, sorry for not getting back to you. Yes, I'm back from vacation now :)

    I looked through the circuit, and there are some issues with the antenna design, but that does not explain why the chip is not working at all.

    First I have a question about the SWD interface. I see that you are routing SWDIO and SWDCLK out through a USB port. What type of debugger are you using, and how do you get the reference voltage to the debugger? Are you using this port both for debugging and to power the board with 5V?

    I don't think there are any obvious reasons why the IC is not working. I think you need to check the voltage levels and the soldering if there are any short circuits or unsoldered pins.

    • Check VDD voltage
    • Check DEC4 and DEC1 voltages, should be around 1.3/1.1V
    • Check SWDIO and SWDCLK voltage levels when connected to the debugger
    • Check if some of the passive components (especially decoupling caps on DEC1 and DEC4) are broken
    • Were you able to flash the chip the first time, or not at all? If you were able to flash it the first time, there might be some problems with the DCDC inductors.

    Best regards,
    Stian

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