I have designed several boards for the nRF51822-QFAA, namely with/for the Waveshare Core51822 module.
While one is working as expected - namely my "Orchid Lamp" (see links below) - others - namely my "nRFduino" - are only working, when the attached nRF51 ist manually started using a debugger. When the nRFduino is powered e.g. via USB and an onboard 3.3V LDO, the nRF51 appears to remain in reset, as the flashed in firmware will not start to run. However, once started using a debugger, it continues to run from USB power alone.
Did I make any mistakes in my design?
Are there some special design requirements, which I did not meet?
Links:
- Core51822 homepage: www.waveshare.com/.../Core51822
- Core51822 schematic: www.waveshare.com/.../Core51822-Schematic.pdf
- Orchid Lamp design files: github.com/.../Orchid-Lamp.PCB
- Orchid Lamp main schematic:
- nRFduino design files: github.com/.../nRFduino.PCB
- nRFduino main schematic:
