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 Name	Signal Description
1	USBA_VBUS_5V	First port 5V power
2	USBA_N	First port data minus
3	USBA_P	First port data plus
4	GND	First 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
PIO	Signal Name	Shared	Signal Description
PC6	USBC_EN_5V_PC6	–	Power switch enable (active high)
PC17	USBC_OVCUR_PC17	–	Indicates overcurrent (open drain)