USB type-C Details
USB type-C Details
The type-Cconnectors connect to both hosts and devices, replacing various type-B andtype-A connectors and cables with a standard meant to be future-proof. The 24-pin double-sided connector is similar in size tothe micro-B connector, with a type-C port measuring 8.4 millimetres(0.33 in) by 2.6 millimetres (0.10 in). The connector provides fourpower/ground pairs, two differential pairs for non-SuperSpeed data (though onlyone pair is populated in a type-C cable), four pairs for high-speed data bus,two "sideband use" pins, and two configuration pins for cableorientation detection, dedicated biphase mark code (BMC)configuration data channel, and VCONN +5 V power for active cables. Connecting an olderdevice to a host with a type-C receptacle requires a cable or adapter with atype-A or type-B plug or receptacle on one end and a type-C plug on the otherend. Legacy adapters with a type-C receptacle are not allowed.
Full-featuredtype-C cables are active, electronically marked cables that contain a chip withan ID function based on the configuration channel and vendor-defined messages(VDMs) from theUSB Power Delivery 2.0 specification. Type-C devices may optionally support buspower currents of 1.5 A and 3.0 A (at 5 V) in addition tobaseline bus power provision; devices can either advertise increased USBcurrent through the configuration channel, or they can support the full powerdelivery specification using both BMC-coded configuration line and legacy BFSK-coded VBUS line.
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