I recently designed a PCB that'll power and control a NEMA 17 stepper motors. I decided it will be powered by a 15W (5V3A) USB-C cable and wall adapter. According to my research, the 15W power is the standard USB-C power without the PD (power delivery) protocol. Because it didn't use the PD protocol, I I thought can just connect the Vbus & GND and that'll get me the 5V 3A draw. Therefore, I left the CC1 and CC2 pin not connected as shown in the picture below:
However, as I looked into the PD protocol, I found this info where it still uses the CC1 and CC2 pin under standard USB-C power. They had this Rd resistors added between the CC1 and CC2 pins.
I've already submitted my PCB to the manufacturer for production (a small batch of 5 pcs). Would the USB-C wall adapter and cable still be able to power my PCB without the Rd resitors?