I am using an USB C connector for both charging and data transfer trough this. What would happen if I connect without grounding the cc1 and cc2.My question is i am not using any power delivery IC for negotiation i want to simply get 5V 500mA from the USB is the pull down resistors enough.

 

If you don't put the pulldown resistors on the CC pins, if you connect the device to a USB C PD supply, the device will NOT receive power. Add the resistors.

 

If you don't put the pulldown resistors on the CC pins, if you connect the device to a USB C PD supply, the device will NOT receive power. Add the resistors.

Thankyou for the answer I am not using any power delivery IC and can I get 500mA 5V current draw with these pull down resistors. Also is this circuit good for USB A adapter.

 

If you're using a USB A supply with an A–C cable, the resistors aren't required. But including the resistors will allow the device to be powered from ANY USB supply.

Leaving out the resistors is a common mistake on many dev boards. Power it with a C–C cable and the board looks dead; power it with an A–C cable and it works fine.

Save yourself the headache of the device not working with some supplies – use the resistors. There is no situation where including the resistors will cause problems.