USB 2.0 was released in April 2000, adding a higher maximum signaling rate of 480 Mbit/s (maximum theoretical data throughput 53 MByte/s) named High Speed or High Bandwidth, in addition to the USB 1.x Full Speed signaling rate of 12 Mbit/s (maximum theoretical data throughput 1.2 MByte/s).
Modifications to the USB specification have been made via engineering change notices (ECNs). The most important of these ECNs are included into the USB 2.0 specification package available from USB.org.
- Mini-A and Mini-B Connector
- Micro-USB Cables and Connectors Specification 1.01
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- Battery Charging Specification 1.1 Added support for dedicated chargers, host chargers behaviour for devices with dead batteries
- Battery Charging Specification 1.2 with increased current of 1.5 A on charging ports for unconfigured devices, allowing High Speed communication while having a current up to 1.5 A
- Link Power Management Addendum ECN, which adds a sleep power state
- USB 2.0 VBUS Max Limit, increased the maximum allowable V_BUS voltage from 5.25V to 5.50V to align with the USB Type-C Spec, which was released simultaneously.
- InterChip USB Supplement
- On-The-Go Supplement 1.3 USB On-The-Go makes it possible for two USB devices to communicate with each other without requiring a separate USB host
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