Uno R4 schematic

[awneil]

@jojo

we are looking into it

Please also look into the other recent threads about DNP components not (properly/consistently) identified:

Giga R1 resistor R23

If resistor R23=0 (see below schematics), then log.1 cannot be set on pin Analog A7. Is it really true? [Giga_R23]

USB connector switch

Looking at the different datasheets and documentation the USB connection can be switched between the Renesas and ESP32 processor (default) This can be done with the U2 and U6 analog switch. Looking at the schematics I am confused. The SJ1 should be connected to make the switch, but it seems that Renesas P408 could also be used for that. The P408 is defined in variant.cpp with offset 21 but there is no D21 defined in pin_arduino.h. I have not seen this documented somewhere else (yet... maybe I…

It looks like a general review of all schematics might be in order ...