photo:usb
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | |||
| photo:usb [2025/11/25 10:18] – [USB-A port colors] gary1 | photo:usb [2026/08/11 23:43] (current) – [Connector types] gary1 | ||
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| Line 96: | Line 96: | ||
| * Micro AB | * Micro AB | ||
| + | =====Summary of wiring===== | ||
| + | ***power** | ||
| + | * GND, 5V VBUS (USB-A compatibility) | ||
| + | * on USB-A, QC 18W charging is provided through D+ and D-, but on USB 3.0 onwards QC is usually via CC1 and CC2 | ||
| + | * **CC1 and CC2 were added in USB-C for PD power** and added to detect orientation of connector and negotiate PD role, voltage and current | ||
| + | ***data** | ||
| + | * **D+ and D-** (USB-A compatibility) | ||
| + | * **TX1 and RX1 pairs were added to USB 2 to give increased data transfer rates** | ||
| + | * **TX2 and RX2 pairs were later to USB 3 to give further increased data transfer rates** | ||
| =====USB protocol====== | =====USB protocol====== | ||
| *USB device communication is based on pipes (logical channels) which are connections between the host and the logical connection in a device - each USB device can have up to 32 endpoints (16 in and 16 out), though it is rare to have so many. | *USB device communication is based on pipes (logical channels) which are connections between the host and the logical connection in a device - each USB device can have up to 32 endpoints (16 in and 16 out), though it is rare to have so many. | ||
photo/usb.txt · Last modified: 2026/08/11 23:43 by gary1