In our specific application, we have an analog input signal to the AIN0 pin of the nrf52840 chip.
We know that the maximum negative voltage in a GPIO must be -0.3 V, and in our case, we can receive signals up to -0.115 V. This occurs with a power source of 100 V 60 Hz and a 900 W load.
According to the specifications, we are on the safe range, but we still receive negative voltage. And as we are going to produce a large quantity of this devices, we want to be 100% sure that both the pin and the nrf52840 chip will not be damaged when receiving this negative voltage.
Could you please verify this?
Thank you.
