ISO/IEC 7816-12:2005 PDF

Identification cards - Integrated circuit cards — Part 12: Cards with contacts — USB electrical interface and operating procedures

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Title (English):

ISO/IEC 7816-12:2005

Identification cards - Integrated circuit cards — Part 12: Cards with contacts — USB electrical interface and operating procedures

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 50
Publication date:: October 4, 2005
Edition:: ISO/IEC IS 7816 edition 1 version 1
ICS:: 35.240.15

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Description (English):

ISO/IEC 7816-12:2005 specifies the operating conditions of an integrated circuit card that provides a USB interface. An integrated circuit card with a USB interface is named USB-ICC. ISO/IEC 7816-12:2005 specifies the electrical conditions when a USB-ICC is operated by an interface device - for those contact fields that are not used, when the USB interface is applied; the USB standard descriptors and the USB-ICC class specific descriptor; the data transfer between host and USB-ICC using bulk transfers or control transfers; the control transfers which allow two different protocols named version A and version B; the (optional) interrupt transfers to indicate asynchronous events; status and error conditions. ISO/IEC 7816-12:2005 provides two protocols for control transfers. This is to support the protocol T=0 (version A) or to use the transfer on APDU level (version B). ISO/IEC 7816-12:2005 provides the state diagrams for the USB-ICC for each of the transfers (bulk transfers, control transfers version A and version B). Examples of possible sequences which the USB-ICC must be able to handle are given in an informative annex.

Technical details

Technical committee: ISO/IEC JTC 1/SC 17 - Cards and security devices for personal identification
SKU: ISO/IEC 7816-12:2005

Abstract

Overview

ISO/IEC 7816-12:2005 defines the electrical interface and operating procedures for integrated circuit identification cards that provide a USB interface (called USB-ICC). The standard specifies how a card with contacts maps USB signals to the card contact fields, the required USB descriptors, class-specific descriptors, supported data-transfer methods (bulk, control and optional interrupt transfers), two control-transfer protocols (Version A and Version B) and the state diagrams and status/error reporting required for reliable host–card interaction.

Key Topics

USB-ICC electrical mapping: assignment of card contacts (notably C1, C5, C4 and C8) to USB signals (VBUS, GND, D+, D-). Cards designed for one interface (USB or ISO/IEC 7816-3) must not be damaged when activated under the other.
Contact isolation rules: contacts not used for USB must be electrically isolated; interface devices that do not support USB must keep AUX1/AUX2 isolated or ensure voltages remain between –0.3 V and Vcc +0.3 V.
USB descriptors: mandatory standard device/configuration/interface/endpoint descriptors plus a class-specific descriptor for USB smart-card devices so hosts can enumerate and load appropriate drivers.
Data transfer modes:
- Bulk transfers for general data exchange and ATR transmission.
- Control transfers with two protocol variants:
  - Version A - supports Protocol T=0.
  - Version B - supports transfer at APDU level.
- Optional interrupt transfers to signal asynchronous or “virtual insertion/removal” events.
Protocols, status and error handling: state diagrams for each transfer type and informative annexes with example sequences the USB-ICC must handle.

Applications and Users

ISO/IEC 7816-12 is essential for manufacturers and integrators working with USB-enabled smart cards, including:

Smart card manufacturers designing USB tokens, eID cards, or USB-contact hybrid cards.
Firmware and driver developers implementing CCID/USB smart-card drivers and host-side software.
System integrators and vendors of USB card readers and USB connection devices.
Payment, government ID, access control and authentication solution providers adopting USB smart-card form factors.
Test labs and certification bodies verifying interoperability, descriptor correctness, transfer handling and error conditions.

Adopting ISO/IEC 7816-12 ensures consistent USB enumeration, reliable APDU or T=0 transport, and predictable behavior across hosts and USB-ICC implementations.

Related Standards (if applicable)

ISO/IEC 7816 series (Parts 1–11, 15) - physical, electrical and command-level rules for integrated circuit cards
ISO/IEC 7816-2 (contact locations) and ISO/IEC 7816-3 (electrical interface and transmission protocols)
USB Specification (Universal Serial Bus 2.0) and USB CCID (Chip/Smart Card Interface Device) class specification

Keywords: ISO/IEC 7816-12, USB-ICC, USB smart card, CCID, USB descriptors, bulk transfers, control transfers, APDU, smart card USB interface.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

USB-ICC electrical mapping: assignment of card contacts (notably C1, C5, C4 and C8) to USB signals (VBUS, GND, D+, D-). Cards designed for one interface (USB or ISO/IEC 7816-3) must not be damaged when activated under the other.
Contact isolation rules: contacts not used for USB must be electrically isolated; interface devices that do not support USB must keep AUX1/AUX2 isolated or ensure voltages remain between –0.3 V and Vcc +0.3 V.
USB descriptors: mandatory standard device/configuration/interface/endpoint descriptors plus a class-specific descriptor for USB smart-card devices so hosts can enumerate and load appropriate drivers.
Data transfer modes:
- Bulk transfers for general data exchange and ATR transmission.
- Control transfers with two protocol variants:
  - Version A - supports Protocol T=0.
  - Version B - supports transfer at APDU level.
- Optional interrupt transfers to signal asynchronous or “virtual insertion/removal” events.
Protocols, status and error handling: state diagrams for each transfer type and informative annexes with example sequences the USB-ICC must handle.

Applications and Users

ISO/IEC 7816-12 is essential for manufacturers and integrators working with USB-enabled smart cards, including:

Smart card manufacturers designing USB tokens, eID cards, or USB-contact hybrid cards.
Firmware and driver developers implementing CCID/USB smart-card drivers and host-side software.
System integrators and vendors of USB card readers and USB connection devices.
Payment, government ID, access control and authentication solution providers adopting USB smart-card form factors.
Test labs and certification bodies verifying interoperability, descriptor correctness, transfer handling and error conditions.

Adopting ISO/IEC 7816-12 ensures consistent USB enumeration, reliable APDU or T=0 transport, and predictable behavior across hosts and USB-ICC implementations.

Related Standards (if applicable)

ISO/IEC 7816 series (Parts 1–11, 15) - physical, electrical and command-level rules for integrated circuit cards
ISO/IEC 7816-2 (contact locations) and ISO/IEC 7816-3 (electrical interface and transmission protocols)
USB Specification (Universal Serial Bus 2.0) and USB CCID (Chip/Smart Card Interface Device) class specification

Keywords: ISO/IEC 7816-12, USB-ICC, USB smart card, CCID, USB descriptors, bulk transfers, control transfers, APDU, smart card USB interface.

ISO/IEC 7816-12:2005 PDF

Technical details

Abstract

Overview

Key Topics

Applications and Users

Related Standards (if applicable)

Related standards

Abstract

Overview

Key Topics

Applications and Users

Related Standards (if applicable)

Related standards

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