第四十五篇：USB Type-C Spec知识点摘要

1. 缩写

Downstream-Facing Port (DFP)

Upstream-Facing Port (UFP)

Dual-Role Port (DRP)

Electronically Marked Cable Assembly (EMCA)

VCONNECTOR (VCONN)
USB Type-C bus wire used to power the IC in the EMCA

Configuration Channel (CC)
USB Type-C bus wire used to carry the PD protocol signals.  

Sideband Use (SBU)
USB Type-C bus wire used for non-USB control signals

Provider, Consumer
A Provider is a Type-C port that sources power over V BUS ; a Consumer is a Type-C port that sinks power from V BUS

Rp, Rd
A DFP exposes Rp terminations on its CC pins (CC1 and CC2) and a UFP exposes Rd terminations on its CC pins. 

Ra
Cable need to expose Ra on its VCONN pin to get power from the DFP.

2. Pins

USB TYPE C一共有22（plug）pins ：24（ Receptacle ）pins

其中

4 Ground and VBUS Conductors： 8
2 Super Speed interfaces ： 8
1 Configuration Channel ： 1
1 Vconn: 1
2 SBU :2

1(2) High Speed interfaces: 2 (4)

3. cable flip

Upside-up -- Upside-up

Upside-up -- Upside-dn

Upside-dn -- Upside-dn

Upside-dn -- Upside-up

CC由Rp上拉

CC由Rd(CC),Ra(Vconn)下拉

4.阻值

Rd固定： 5.1K

Rp三种值来确定VBUS的输出

0.9A，5V, 56K

1.5A, 5V,         22K

3A, 5V, 10K

Ra: 800~1.2K