IEC 62680-2-1:2015

Overview

IEC 62680-2-1:2015 - Universal serial bus interfaces for data and power, Part 2-1 - is the IEC-adopted version of the Universal Serial Bus Specification, Revision 2.0 (USB 2.0). This international standard defines the industry-standard USB interfaces for data and power, describing bus attributes, protocol definitions, transaction types, bus management and the programming interface needed to design interoperable hosts and peripherals across portable, desktop and home environments. The document is based on USB Implementers Forum (USB‑IF) material and supports open-architecture interoperability between vendors.

Key topics and technical requirements

The standard covers essential USB architecture and implementation requirements, including:

• Bus architecture and topology - host-centric model, devices, hubs and logical/physical topology
• Physical interface - electrical and mechanical interface considerations (connectors/cables referenced in the broader IEC 62680 series)
• Power distribution and management - rules for bus power, power allocation and device power states
• Protocol and transactions - control, bulk, interrupt and isochronous transfer types, packet formats and sequencing
• Endpoints and pipes - device endpoints, logical pipes and mapping to transfer types
• Bus enumeration and configuration - device attachment/removal, enumeration and descriptor usage
• Error detection and robustness - mechanisms for error handling and reliable communication
• Programming interface - software/driver interactions required for compliant host and device implementations
• Compliance guidance - interoperability goals and references to USB compliance and testability (note: IEC does not itself provide conformity assessment)

Practical applications and who uses this standard

IEC 62680-2-1 is intended for:

• System OEMs designing PCs, consumer electronics and embedded hosts that implement USB 2.0 interfaces
• Peripheral and device manufacturers (keyboards, storage devices, audio/video peripherals, hubs) seeking interoperability
• Firmware, driver and OS developers implementing USB stacks, device descriptors and endpoint behavior
• Test labs and compliance engineers validating USB functionality, enumeration and power behavior
• Product managers and architects ensuring designs allow market differentiation without losing compatibility

Practical uses include designing host controllers, USB device firmware, hub implementations, and ensuring correct power/communication behavior across vendor devices.

Related standards

• IEC 62680-1-1 - USB Battery Charging Specification (common components)
• IEC 62680-2-2 - USB Micro/Type‑C cables and connectors (cable/connector specifics)
• IEC 62680-2-3 - USB Cables and Connectors Class Document

Keywords: IEC 62680-2-1, USB 2.0, USB specification, USB interfaces for data and power, USB protocol, USB compliance, USB-IF, USB devices, USB host.