ST AN4054 APPLICATION NOTE
AN4054
Application note
Comparison of RF addressing modes of
low-density and high-density ISO/IEC 15693 devices
Introduction
This application note highlights the key differences of RF addressing modes between the
products of the ISO/IEC 15693 STMicroelectronics family, which is composed of the dual
interface EEPROM products (M24LRx) and the long range contactless products (LRix).
The memory size is a key point and has an impact on some specific parameters of the RF
(Radio frequency) commands.
Dual interface memory M24LRx overview
M24LRx devices are a dual-interface EEPROM. They feature an I2C interface. They are also
a contactless memory powered by the received carrier electromagnetic wave. Thus, its
internal memory can be addressed by either an I
The M24LRx products are compliant to the ISO/IEC 15693 recommendation for radioÂfrequency power and signal interface.
2
C bus or the RF interface.
Long range contactless tag LRxK overview
LRxK devices are contactless memory powered by the received carrier electromagnetic
wave with an EEPROM. They are compliant with the ISO/IEC 15693 specification.
March 2012 Doc ID 022825 Rev 1 1/10
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Contents AN4054
Contents
1 Comparison between low-density and high-density devices . . . . . . . . 4
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 IC reference of ISO/IEC 15693 products . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Memory mapping of ISO/IEC 15693 products . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Request_flags management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.1 Request_flags description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.2 Protocol Extension bit of Request_flags management . . . . . . . . . . . . . . 7
Appendix A Acronym and notational conventions . . . . . . . . . . . . . . . . . . . . . . . . 8
A.1 List of acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A.2 Notational conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A.2.1 Binary number representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A.2.2 Hexadecimal number representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A.2.3 Decimal number representation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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AN4054 List of tables
List of tables
Table 1. Low-density and high-density devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2. IC references of the ISO/IEC 15693 family products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 3. Memory mapping of LRix and M24LRx devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 4. Addressing mode of LRix and M24LRx devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 5. Write single block request format for low-density products. . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 6. Write single block request format for high-density products . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 7. RF command for low-density products using 1 byte and high-density products using
2 bytes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 8. RF command frame for low-density products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 9. RF command with block number parameter frame for high-density products . . . . . . . . . . . 6
Table 10. Request_flags functions according to the product types . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 11. List of acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 12. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Doc ID 022825 Rev 1 3/10
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