USB Power Specification
Mode | USB 2.0 | USB 3.x |
---|
Curent Max | Vbus tolerance | Curent Max | Vbus tolerance |
Low-power bus powered | 100mA | 4.40V - 5.25V | 150mA | 4.00V - 5.25V |
High-power bus powered | 100mA | 4.40V - 5.25V | 150mA | 4.00V - 5.25V |
500mA | 4.75V - 5.25V | 900mA | 4.00V - 5.25V |
Self-powered | 100mA | | 150mA | |
Suspend | 500uA | | 2.5mA | |
USB 3.1 Type-C connector supports higher power devices (5V @ 1.5A, 3A).
USB Power Delivery is configurable up to 20 V and 5 A.
Decoupling capacitance between VBUS and ground on devices:
- Maximum is 10uF to limit inrush current.
- Minimum is 1uF to limit flyback voltage on disconnection.
USB Power Delivery Specification
Profile | Supplying capability | Max Power |
0 | reserved | - |
1 | 5V @ 2.0A | 2 W |
2 | 5V @ 2.0A, 12V @ 1.5A. | 18 W |
3 | 5V @ 2.0A, 12V @ 3A. | 36 W |
4 | 5V @ 2.0A, 12V and 20V at 3A | 60 W |
5 | 5V @ 2.0A, 12V and 20V at 5A | 100 W |
USB Speed Specification
Mode | Data Rate | Tolerance |
Low speed | 1.5Mb/s (192KB/s) | ±1.5% or 15,000ppm |
Full speed | 12Mb/s (1.5MB/s) | ±0.25% or 2,500ppm |
High speed (USB2.0) | 480Mb/s (60MB/s) | ± 500ppm |
Super Speed (USB3.0) | 4.8Gb/s (600MB/s) | ± 600ppm |
Enhanced Super Speed (USB 3.1) | 10Gb/s (1.25GB/s) | |
USB 2.0 Cable Specification
Data wire size:
Shielded → 28 AWG twisted,
Non-shielded → 28 AWG non-twisted
Power wire size:
AWG | Max length |
28 | 0.81 m |
26 | 1.31 m |
24 | 2.08 m |
22 | 3.33 m |
20 | 5.00 m |