USB Charging
USB Battery Charging
USB Battery Charging 1.2 defines charging-port detection and behavior for legacy and mixed-generation USB charging hardware.
USB Battery Charging characteristics
Compare its purpose, port types, USB Power Delivery relationship, and current relevance.
| Common revision | USB Battery Charging 1.2 |
|---|---|
| Primary purpose | Identify charging-capable USB ports and define charging behavior |
| Common era | Widely associated with USB-A, USB 2.0, and Micro-USB charging hardware |
| Detection | Uses charging-port detection rules associated with the USB data lines |
| Standard Downstream Port | Ordinary USB host or hub downstream port with USB data |
| Charging Downstream Port | USB downstream port supporting data and enhanced charging behavior |
| Dedicated Charging Port | Charging-focused port without ordinary USB data communication |
| USB Power Delivery | Separate specification; the two technologies can coexist in supported implementations |
| Current relevance | Still useful for compatibility with legacy and mixed-generation USB charging equipment |
Sources: USB-IF Battery Charging documents, USB-IF Battery Charging compliance updates, and USB-IF USB Power Delivery.