Cypress EZ-PD CCG2 Development Kit, Руководство пользователя

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Hardware
CY4502 EZ-
PD™ CCG2 Development Kit Guide, Doc. No. 001-96601 Rev. *G
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4.3 USB Type-C Plug
The CY4502 board contains two USB Type-C plugs: J1 and J2.
Figure 4-4 shows the USB 3.0 pins (SS_TX_M, SS_TX_P, SS_RX_P, and SS_RX_M), USB 2.0 pins (D+ and D
–), cable
power signals (VBUS and GND), sideband use (SBU) signals (SBU1, SBU2), and the configuration channel (CC/ VCONN)
that are available on the J1 and J2 USB Type-C plugs. VCONN acts as the local supply for the cable. J1 and J2 serve as
the connectors at either end of the cable and provide a way to connect to Type-C receptacles.
Figure 4-5 depicts the USB
Type-C plug signals.
Figure 4-4. Type-C Plugs
Figure 4-5. USB Type-C Plug Interface (Front View)
Only one CC pin is connected through the cable to establish the signal orientation. The other CC pin is repurposed as
VCONN for powering the electronics in the USB Type-
C plug. Also, only one set of USB 2.0 D+/D− wires is implemented in
a USB Type-C cable. SBU signals are used in Alternate mode, supported by the USB Type-C
™ specification. The
USB Type-C specification supports Alternate mode, which enables multipurposing Type-C signals for alternate uses such
as the display port. It allocates lanes to those other signals as necessary, with muxes at either end (host/device) handling
the switching to determine which signals are on which lanes and where they need to come from or go to. Refer to the
USB
Type-C
™ specification
for more details on Alternate mode. In Alternate mode, activity on the SBU lines does not interfere
with USB PD BMC communications. SBU signals are not implemented for USB 3.0/USB 2.0-only cable applications. Table
4-1 summarizes the signals used on the USB Type-C connectors.