I am looking for the USB-PD sink support in my custom board.
The power delivery requirement at a glance:
- USB-PD support on Type C connector
- Default Sink/Consumer power role, No power role swap required
- No USB data communication over this port.
- The system requires ~33W power after power negotiation
Based on the above requirements, PTN5110 looks a good option to me, refer section 8.1.7 USB PD Sink.
Few questions on the application diagram shown in section 8.1.7:
- Does USB-PD provide 5V by default before required power negotiation to power the TCPM MCU and MCU then negotiate high power, ~33W in our case for the system? I mean 5V at output of NX20P5090 by using pre-configured PTN5110DHQ as a Sink role at POR.
- Is the MCU (TCPM PD POLICY CONTROLLER) is a specific USB-PD controller or an ordinary MCU with I2C interface can work?
- How the PTN5110 negotiates with the USB-PD source for the required power? What are the components/interfaces being involved during the negotiation?
- Vbus to short protection, USB-PD PHY and the external power switch are considered as USB-PD sink components. Already have one Cortex-M MCU in the system for TCPM. Is anything else required for USB-PD sink support to my design?