I would like to ask a question regarding to powering the B-L072Z-LRWAN1 direct from the CN11 USB connector.
The user manual of the B-L072Z-LRWAN1 states the following:
''When the B-L072Z-LRWAN1 board is powered by an external power supply through USB FS connector (CN11), in device mode, do not use a PC as power source if the current consumption is greater than 100 mA, otherwise the PC can be damaged.''
As far as i know a PC's USB2.0 port can provide up to 500mA. On the other hand the maximum current consumption of the B-L072Z-LRWAN1 is 300mA. Why the datasheet recommends not to source power direct from the PC? My test plan is to power and control the CMWX1ZZABZ-091 direct from the USB port.
Any help would be highly appreciated.