Hi.
In the product I'm working there is a qi and NFC antenna on the same side. I resolved the issue of the qi charger overloading the nRF by placing a 1nF capacitor in series to the NFC antenna so that the nRF NFC front end is able to absorb any residual signal. But what I now noticed is that if I start the qi charging, and later test the power consumption of the nRF it skyrockets
up to 1mA or even more. The nRF continues to operate normally, everything still works. The power consumption can be brought back to normal by power cycling the device. I tried lowering down the capacitor value to 33pF which then resolves the problem in most cases, but it still can occur, the problem persists even down to 10pF at which point the NFC is barely working due to too much signal attenuation.
This is really a problem, since there is a small battery powering the entire device, and instead of a month the device lasts for 2 days.
Is there anything that I could do in the firmware to resolve this issue or reset the power consumption back once charging is done?
I'm also afraid that even random EMI spikes from other devices could cause a similar issue.
