3.4.2.3 USBC Host Interface

The USBC port can act as a USB device only and can be accessed via the USB Type-A connector (J9).

Figure 3-37. USBC Port Schematic
Table 3-28. USBC J9 Connector Signal Descriptions
Pin No.Signal NameSignal Description
1USBA_VBUS_5VFirst port 5V power
2USBA_NFirst port data minus
3USBA_PFirst port data plus
4GNDFirst port ground

In Host mode, the USB host port C is equipped with 500-mA high-side power switches to enable self-powered and bus-powered applications. The USBC_EN_5V_PC6 signal controls the current limiting power switch MIC2025, which in turn supplies power to a client device. As per the USB specification, bus-powered USB 2.0 devices are limited to a maximum of 500 mA, therefore the MIC2025 limits the current and indicates an overcurrent with the USBC_OVCUR_PC17 signal.

Figure 3-38. USBC Port Power Switch Schematic
Table 3-29. USBC Power Switch PIO Signal Descriptions
PIOSignal NameSharedSignal Description
PC6USBC_EN_5V_PC6–Power switch enable (active high)
PC17USBC_OVCUR_PC17–Indicates overcurrent (open drain)