The SBU lines are typically used as AUX_P/AUX_N differential lines in the DP protocol when DisplayPort (DP) is enabled. On today's development boards, the PD/QC power-on and USB HOST/OTG interfaces on Type-C rarely use the SBU lines. Since QC power-on and USB functionality require DP/DM, a 16-pin Type-C female connector is commonly used.
The 16-pin Type-C female connector comes with SBU1 and SBU2, but they are usually unused. Perfectly, the RX and TX pins for the debug serial port can be used for them.
So, I've created an elegant little accessory to complement this elegant design. This design includes both 16-pin and 24-pin female connectors (I personally think the 24-pin version is unlikely to be used and is more difficult to solder). All connectors are from the Soho brand (a 16-pin minus 15-pin option). With a cheap MX1.25-3P to DuPont adapter cable, it can connect to most TTL serial port tools on the market.
Note: If communication fails, the TX/RX lines may not be crossed; simply flip the Type-C cable.
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