AN3955 datasheet(11/68 Pages) STMICROELECTRONICS

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AN3955

Overview

Doc ID 022017 Rev 1

11/68

Overview

3.1

CR95HF overview

The CR95HF is a Radio Frenquency (RF) transceiver Integrated Circuit (IC) for 13.56 MHz

contactless tags, which includes ISO/IEC 14443, ISO/IEC 15693 and ISO/IEC 18092

protocols. It manages the RF communication with Radio Frequency Identification (RFID) or

Near Field Communication (NFC) tags. It includes trame coding, RF modulation and

contactless tag response decoding.

The CR95HF is a slave device and must be controlled by a host (Microcontroller Unit). This

library is an interface between user application function and standard peripheral driver.

The library was written in compliance with ANSI C standards.

Figure 1 describes a typical application block diagram.

Figure 1.

Typical application block diagram

For more details concerning the CR95HF, please refer to CR95HF datasheet.

3.2

ISO/IEC 14443-3 overview

The ISO/IEC 14443-3 is a standard, which specifies two different RF protocols (Type A and

Type B). It describes low-level functions allowing to handle one ore more contactless tags.

As an example, the ISO/IEC 14443-3 commands can be used to read the Unique Identifier

(UID) or to perform anti-collision.

The higher level commands to read or write the user memory of contactless tags are not

described in ISO/IEC 14443-3 specifications. These commands are defined in the

contactless datasheet. For instance, the SRIX4K datasheet defines Read, Write and other

specific commands.

For more information about Read, Write or other commands, refer to the SRIX4K datasheet.

Since the frames coding specified by ISO/IEC 14443 Type A differ from Type B, the CR95HF

cannot communicate with an ISO/IEC 14443 Type A and an ISO/IEC 14443 Type B

contactless tag at the same time.

AI18873a

ISO15693 RF

MCU

CR95HF

Contactless tag

CR95HF

library

14443 type A

14443 type B

13,56 MHz RF commands

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