Has anyone observed incorrect readings on power meters when measuring power consumption of the FRDM i.MX 91S board with UART attached?
I managed to get a probably faulty reading of 50mW of power consumption recording with a USB tester as once the secondary USB cable is removed (UART) power reading goes up to 520mW.
Could the Net "DEBUG_VBUS_5V" or "VIO" feeding more than just the UART chip?
Thank you,
Tomás
Sorted, it was a ground loop. I recommend separating the power to the device and the power from your PC.
E.G Device is powered though USB C PD charger (J1) as it is isolated from mains. While UART is from your laptop/pc