AN2972 datasheet(23/25 Pages) STMICROELECTRONICS

23 / 25 page

AN2972

From design to production

Doc ID 15629 Rev 6

23/25

Figure 26. Impact of housing/packaging material on RF communication

Process flow

●

Design:

–

Start from the dual interface EEPROM’s internal tuning frequency (Ctuning).

Hint: check the device datasheet.

–

Calculate the theoretical Lantenna value based on Ctuning and ftuning.

Hint: use the simplified models in this application note or other more sophisticated

models developed in the RF literature.

–

Define the antenna dimensions.

–

Compute the theoretical antenna design and layout.

●

Prototyping

–

Define an antenna matrix with different values centered around the targeted

Lantenna value.

Hint: select 6 to 10 antennas with inductances that vary around L

antenna by steps

of 5 %.

–

Fabrication of the antennas and M24LRxx mounting.

For each prototype:

–

Measure the antenna’s tuning frequency.

–

Measure the read range with all types of selected RFID readers.

–

Measure the read range in configurations close to the actual product usage.

●

Industrialization

–

Characterize the tuning frequency dispersion on a significant number of samples.

–

Measure the read range of the lowest and highest tuning frequency boards with

various readers and in the various configurations.

–

Validate that the selected target Lantenna value is appropriate versus the process

variation.

●

Production

–

Process monitoring

ai17301

Dual interface EEPROM

Nonconductive housing:

RF communication OK

Conductive housing:

no RF communication

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