In a support document released on Friday, Apple provided some additional details about the USB-C port on all iPhone 15 models. First, Apple says all iPhone 15 models can charge an Apple Watch, AirPods case, or other small accessories connected to a USB-C port with up to 4.5W. Apple has previously announced this feature but did not provide power information.
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Secondly, the document shows that iPhone15Pro and ProMax support USB3.2Gen2, with data transmission speeds of up to 10Gbps. Apple has already revealed that these devices will support USB3, but the exact specifications have now been confirmed. However, the USB-C cable included with the iPhone 15 Pro models only supports USB2 speeds, so a higher-spec cable is required to get faster speeds.
As we previously reported, the filing suggests that all iPhone 15 models support DisplayPort, enabling mirroring of 4KHDR video to an external monitor or TV via a supported USB-C to DisplayPort cable or adapter. However, unlike some iPad models with StageManager, the iPhone lacks an extended display mode.
The iPhone 15 Pro model also supports recording ProRes video directly to external storage devices, up to 4K and 60 frames per second.
Apple says that to connect iPhone 15 to a vehicle with a USB-A port for wired CarPlay, customers can use a USB-C to USB-A cable.
Additional information is outlined in the supporting documentation:
https://support.apple.com/en-us/HT213839