I recently acquired an Arduino Nano Every board. I am trying to find out as much as I can about it.
On the Forum I came across the next topics:
1: Can Nano Every be destroyed by drawing power from VIN when powered via USB?
Answer: Yes
The body diode of the driver MOSFET will conduct and allow current to be drawn from VIN.
It does take a sufficient power source at the +5V pin and a sufficient power hungry load (or short circuit) at VIN. I do expect the device to withstand at least what it is designed for in forward direction.
The probability of this is low, but the board offers no protection.
2: Ripple voltage from onboard 5V regulator of Nano Every
2a: Arduino Nano Every - Vin Buck Converter ripple?
Someone measured 100mV ripple at the 5V supply.
Someone else measured 20mV ripple @ 2MHZ at the analog inputs, while powered by a linear power source.
Apparently the power feedback mentioned here above is capable of raising the Enable input of the voltage regulator, switching on the oscillator.
Both these problems can be solved with one diode between the resistor to the Enable input and the power input.
Furthermore, I noticed that the supply of the analog circuitry of Nano Every has no decoupling whatsoever. A circuit like on the Uno would might make a difference (even when the 4809 datasheet doesn’t mention it).
