M24LR64-RMN6T2 datasheet(39/128 Pages) STMICROELECTRONICS

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M24LR64-R

RF device operation

Doc ID 15170 Rev 10

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7.2

Initial dialog for vicinity cards

The dialog between the vicinity coupling device or VCD (commonly the “RF reader”) and the

vicinity integrated circuit card or VICC (M24LR64-R) takes place as follows:

●

activation of the M24LR64-R by the RF operating field of the VCD

●

transmission of a command by the VCD

●

transmission of a response by the M24LR64-R

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).

7.2.1

Power transfer

Power is transferred to the M24LR64-R by radio frequency at 13.56 MHz via coupling

antennas in the M24LR64-R and the VCD. The RF operating field of the VCD is transformed

on the M24LR64-R 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.

7.2.2

Frequency

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

13.56 MHz ±7 kHz.

7.2.3

Operating field

The M24LR64-R operates continuously between the minimum and maximum values of the

electromagnetic field H defined in Table 105. The VCD has to generate a field within these

limits.

M24LR64-RMN6T2 Datasheet(PDF) 39 Page - STMicroelectronics