good day!
Arduino-Due has an input DC-DC pulse converter by 5V (Input to 5V), then a linear stub is on 3.3V, power to kernel ATSAM3X8EA
Net-Schild also has stabs at 5-> 3.3V
When connecting shild and Arduino, 5V, 3B and GND are connected (This is a note)
separately, when applying, both devices work normally 3.3V
If the net-shield is connected to the Arduino-Due, the Linear converter gives 5V (instead of 3.3V) directly on the kernel
There was no time to understand, the old oscilloscope showed only a small "noise" (remnants from a large storm)
Fact confirmed: 3 burnt arduino-due (it's not me, everyone did it before me :o)
I hope the community will come in handy
###!!! UPDATE !!!###
a short circuit of 5 to 3 volts goes in two directions:
1. ISP-pin +power (net-module +5, arduino-due +3)
2. AREF-pin, connect to Power bus (net-module +5, arduino-due +3)
solution / refinement of the NET module:
ISP-pin - desold/feed/off pin
AREF-pin - turn off
+3.3-pin - turn off
after mod:
- power - good
- net module is init & set ip-adress
