USB 2.0 (BC 1.2)
- PD: Portable Device
- SDP: Standard Downstream Port - Data + 500mA for USB 2.0
- CDP: Charging Downstream Port - Data + 1500mA
- DCP: Dedicated Charging Port - 1500mA
Primary Detection
- VBUS > 0.8V
- 0.5-0.7V on DP
- Check DM Voltage
- If DM is lower than DP, SDP (500mA).
a. SDP has 15K Ohm pull down on DP and DM. - If DM is roughly equal to DP, CDP/DCP (1500mA).
a. CDP/DCP has 200 Ohm resistor between DP and DM.
USB 3.0 Type C
- Supports USB BC 1.2 via DM and DP
- 500mA (USB 2.0), 900mA (USB 3.0), 1500mA, 3000mA
- DFP: Rp pull up
- UFP: Rd pull down
- e-marked/Active: Ra pull down
USB Type C DFP CC1/CC2 Rp Pull Up
- 500mA USB 2.0 or 900mA USB 3.0: 56K to 5V or 36K to 3.3V
- 1500mA: 22K to 5V or 12K to 3.3V
- 3000mA: 10K to 5V or 4.7K to 3.3V
USB Type C UFP CC1/CC2 Rp Pull Down
- 1500mA or 3000mA: 5.1K to GND
USB Type C Active Ra Pull Down
- VCONN to GND 0.8-1.2K
USB Power Delivery 2.0
- 1-wire over CC 300K Baud
- DFP Bus Master
- 32-bit 4b/5b BMC Encoding with CRC32 + Retry
- Above 5V operation
- Above 3A operation
- Passive cable up for to 60W
- e-marked cable use 70mW max for above > 60W
- Active cable use 1W max
Alternative Modes
- TX1
- RX1
- TX2
- RX2
- SBU1
- SBU2
Cable Requirements
- 50 Ohm impedance CC/SBU1/SBU2
- 250mV GND Vdrop
- 500mV VBUS Vdrop
- USB 2.0: 4M Max
- USB 5Gb: 2M
- USB 10Gb: 1M
Resources