← back to legend
Communication buses

USB-PD

USB Power Delivery
The protocol that lets USB-C negotiate voltages above 5 V (up to 20 V, 5 A).

How it looks

Drawing: this is not on CORE3588, so it is drawn
chargerdeviceCC wire: messagesVBUS: 5 V, then 9, 15 or 20 V once agreed
USB Power Delivery: the two ends talk over the CC wire before raising the voltage. CORE3588 does not use it; it takes the default 5 V.

How it works

NEGOTIATING POWERchargerdeviceplugged in: 5 V only, the safe defaultcharger: "I can do 5, 9, 15 or 20 V, up to 5 A"device: "20 V at 3 A, please"charger raises the voltage: 60 W flows

Where it fits

USB-PD runs over USB-C; the board side often uses a small controller chip or a PMIC.

← back to legend