ISO/IEC 14443-3:2018

Overview

ISO/IEC 14443-3:2018 - "Cards and security devices for personal identification - Contactless proximity objects - Part 3: Initialization and anticollision" defines the initial radio-frequency (RF) and protocol behaviour used when a proximity coupling device (PCD) and one or more proximity integrated circuit cards (PICC) first interact. The standard specifies polling, byte and frame formats, timing for the initial communication phase, command/response content used to discover and select PICCs, and methods to detect and resolve collisions when multiple PICCs are present. It applies to PICC Type A and Type B, PCDs and devices that can alternate roles (PXDs). This is the 2018 (4th) edition.

Key technical topics and requirements

• Polling and request/answer sequences: Procedures for detecting PICCs entering the PCD magnetic field and initial REQA/WUPA (Type A) or REQB/WUPB (Type B) exchanges.
• Frame and byte formats, timing: Definition of bit/byte formats, frame structures, CRC_A / CRC_B checks, frame delays and guard times required during initialization.
• Anticollision and selection: Algorithms and command sets (anticollision, SELECT, Slot‑MARKER, ATTRIB, HLTA/HLTB) to detect multiple PICCs and reliably select a single PICC for further communication.
• PICC state machine: States such as POWER‑OFF, IDLE, READY, ACTIVE, HALT and transitions relevant to initialization and selection.
• PXD support: Optional capability for a device to alternate between PICC and PCD roles and the requirements for role switching.
• Electromagnetic disturbance handling: Timing constraints and recommended PCD algorithms for handling disturbances during initialization.
• Optional speed/selection aids: Mechanisms to accelerate selecting a PICC based on application criteria.
• Conformance and test references: Timing definitions referenced to ISO/IEC 14443‑2 and test methods defined in ISO/IEC 10373‑6.

Practical applications and who uses it

ISO/IEC 14443‑3:2018 is essential for designers and implementers of contactless identification and security systems:

• Smartcard and secure ID manufacturers implementing PICC Type A/B behavior.
• Reader (PCD) hardware and firmware developers ensuring correct polling, anticollision and timing.
• System integrators for access control, identity management, transit ticketing and other proximity card deployments.
• Test laboratories and QA teams using referenced test methods to validate conformance.
• NFC and RFID engineers working with protocols that rely on ISO/IEC 14443 initialization semantics.

Related standards

• ISO/IEC 14443‑2 - RF power and signal interface (timing elements referenced by Part 3).
• ISO/IEC 14443‑4 - Higher-layer protocol and commands used after initialization.
• ISO/IEC 10373‑6 - Test methods for contactless proximity cards.

Keywords: ISO/IEC 14443-3:2018, contactless proximity, initialization, anticollision, PICC, PCD, PXD, Type A, Type B, CRC_A, CRC_B, Slot-MARKER, REQA, REQB.