What is the USB Phy chip used in the XIAO nRF52840?
Can the Phy chip be turned off to reduce power?
Hello, Gordy7,
I believe it’s part of the nRF52840 silicon (NO) but maybe someone else knows for sure. I would think if there’s NO “Serial, Begin”, print" in the code it would No.
my .02
HTH
GL 
PJ
New to the XIAO nRF52840 here and chasing the low power shutdown options.
The schematic Seeed Studio XIAO nRF52840 v1.1 shows the USB Phy block as USB1. In the same way as the block for the flash chip U2.
Ahhh… It has just occured to me that USB1 may just be the symbol for the USB-C connector and that you are correct that the nRF52840 main silicon does all the USB signal processing.
Onwards 