LRIS2K_08 datasheet(15/102 Pages) STMICROELECTRONICS

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LRIS2K

Description

15/102

1.3

Initial dialogue for vicinity cards

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

Card or VICC (LRIS2K) takes place as follows:

●

activation of the LRIS2K by the RF operating field of the VCD.

●

transmission of a command by the VCD.

●

transmission of a response by the LRIS2K.

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 LRIS2K by radio frequency at 13.56 MHz via coupling antennas

in the LRIS2K and the VCD. The RF operating field of the VCD is transformed on the

LRIS2K antenna to 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 LRIS2K 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 shall generate a field of at least Hmin and not exceeding Hmax in the operating

volume.

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