M24LR64-R_1006 Datasheet, PDF (39/128 Pages) STMicroelectronics – 64 Kbit EEPROM with password protection & dual interface

M24LR64-R
RF device operation
7.2
7.2.1
7.2.2
7.2.3
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).
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.
Frequency
The ISO 15693 standard defines the carrier frequency (f_C) of the operating field as
13.56 MHz ±7 kHz.
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.
Doc ID 15170 Rev 10
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