AN3985 datasheet(11/105 Pages) STMICROELECTRONICS

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AN3985

Overview

Doc ID 022255 Rev 2

11/105

Overview

3.1

CR95HF overview

The CR95HF is a Radio Frequency (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 frame 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

Library overview

The library described in this application note is composed of three layers:

●

A low level layer supporting the commands described in the CR95HF datasheet. This

level is fully supported by the CR95HF library.

●

An intermediate layer based on ISO/IEC 15693 specification

●

A product layer supporting the commands described in the LRIxK and M24LRxx

datasheets

3.2.1

Example of an application architecture

The library can be downloaded from http://www.st.com.

Figure 2 shows the interaction between a typical user application and the CR95HF library

layers.

MS19958V1

ISO15693 RF

MCU

CR95HF

Contactless tag

CR95HF

library

ISO15693 RF

Memory products

Dual IC M24LR*

products

RF communication

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