AN3955 datasheet(12/68 Pages) STMICROELECTRONICS

12 / 68 page

Overview

AN3955

12/68

Doc ID 022017 Rev 1

3.3

SRIX4K product overview

The SRIX4K is an STMicroelectronics contactless tag powered by an RF field. It contains

a 4-kbit EEPROM memory that can be accessed by using RF commands.

For more information about low-level commands to handle a tag and an upper level to read,

write or lock memory, refer to the SRIX4K datasheeet.

SRIX4K is compliant with ISO/IEC 14443-3 Type B frame format specification.

3.4

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 the ISO/IEC 14443-3 protocol. This layer is divided in

two files, one for Type A and another for Type B.

●

An upper layer supporting the commands described in the SRIX4K datasheet.

The library can be downloaded from STMicroelectronics internet site at http://www.st.com.

Figure 2 shows an example of application architecture and describes the interaction

between a typical user application and the CR95HF library layers.

Figure 2.

Interaction between typical user application and CR95HF library layers

MS19951V1

User functions

(user application specific)

Standard peripheral driver

(MCU specific layer)

CR95HF library

CR95HF library layer

(integrates the commands defined in CR95HF datasheet)

Protocol layer (embeds commands defined in the ISO/IEC 14443-3 specification)

ISO14443_3 type A library layer

ISO14443_3 type B library layer

Product layer (embeds commands defined in the product datasheet)

SRiX4K layer

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