HW : KK65FN2M0CAC18R
SW : unknown / not applicable
board : custom
I realize that we will likely be unable to answer this question, but per the customer's request I will ask anyway.
The datasheet for this part (K65P169CM180SF5V2 Data Sheet: Technical Data Rev. 4, 04/2017) has a recommendation for unused analog interfaces (Table 62) and USB1_VBUS is recommended to be left floating. The customer has grounded this pin in their current PCB and would like to know if we can approve that connection. (basically, is the recommendation a requirement, or just a suggestion?) The 0V voltage does lie within the allowable range (-0.3 to 6.0V), and the pin is by default unused at the mux level.