LRI2K datasheet(13/89 Pages) STMICROELECTRONICS

13 / 89 page

LRI2K

Description

13/89

1.3

Initial dialogue for vicinity cards

The dialog between the vicinity coupling device (VCD) and the vicinity integrated circuit card

or VICC (LRI2K) takes place as follows:

●

activation of the LRI2K by the RF operating field of the VCD

●

transmission of a command by the VCD

●

transmission of a response by the LRI2K

These operations use the RF power transfer and communication signal interface described

below (see Power transfer, Frequency and Operating field). This technique is called RTF

(Reader Talk First).

1.3.1

Power transfer

Power is transferred to the LRI2K by radio frequency at 13.56 MHz via coupling antennas in

the LRI2K and the VCD. The RF operating field of the VCD is transformed on the LRI2K

antenna as an AC voltage which is rectified, filtered and internally regulated. The amplitude

modulation (ASK) on this received signal is demodulated by the ASK demodulator.

1.3.2

Frequency

The ISO 15693 standard defines the carrier frequency (fc) of the operating field as

13.56 MHz ±7 kHz.

1.3.3

Operating field

The LRI2K operates continuously between Hmin and Hmax.

●

The minimum operating field is Hmin and has a value of 150 mA/m rms.

●

The maximum operating field is Hmax and has a value of 5 A/m rms.

A VCD must generate a field of at least Hmin and not exceeding Hmax in the operating

volume.

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