AN2972 datasheet(24/25 Pages) STMICROELECTRONICS

24 / 25 page

Revision history

AN2972

24/25

Doc ID 15629 Rev 6

Revision history

Table 4.

Document revision history

Date

Revision

Changes

26-May-2009

Initial release.

06-Aug-2009

Modified:

– Introduction

– Section 1.1: Passive RFID technology

– Section 1.2: Simplified equivalent inlay circuit

– Section 1.4: Optimum antenna tuning

– Section 2.3: Inductance of a square antenna

Added: Section 4: From design to production

18-Aug-2009

Corrected equation allowing to compute the tuning frequency on

cover page.

04-Sep-2009

Figure 3: Power supply in RF mode, Figure 5: From the RFID reader

to the M24LRxx and Figure 6: From the M24LRxx to the RFID reader

modified.

Section 2.5: PCB layout added.

Section 3.1: Antenna tuning measurements with a network analyzer

and Section 3.2: Antenna measurements with standard laboratory

tools modified.

Considerations on the actual system tuning frequency added. PCB

manufacturing process validation modified.

Product packaging/housing considerations and Process flow added.

Small text changes.

11-Feb-2010

Document classification level changed to public.

Power transfer updated in Section 1.1: Passive RFID technology.

Section 1.4 title modified.

21-Dec-2012

M24LR64-R replaced by M24LRxx-R and M24LRxxE-R on the cover

page, then by M24LRxx (see Note:).

Moved former 3rd and 4th paragraphs on the cover page to an

Operating mode section.

Added Table 1: Applicable products.

Added Section 2.5.3: Metal considerations.

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