LRIS64K datasheet(20/100 Pages) STMICROELECTRONICS

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Commands

LRIS64K

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Doc ID 15336 Rev 11

5.1

Initial dialogue for vicinity cards

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

Card or VICC (LRIS64K) takes place as follows:

●

activation of the LRIS64K by the RF operating field of the VCD.

●

transmission of a command by the VCD.

●

transmission of a response by the LRIS64K.

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).

5.1.1

Power transfer

Power is transferred to the LRIS64K by radio frequency at 13.56 MHz via coupling antennas

in the LRIS64K and the VCD. The RF operating field of the VCD is transformed on the

LRIS64K 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.

5.1.2

Frequency

The ISO/IEC 15693 standard defines the carrier frequency (fC) of the operating field as

13.56 MHz ±7 kHz.

5.1.3

Operating field

The LRIS64K 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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