M24LR64E-R datasheet(44/140 Pages) STMICROELECTRONICS

Part #	M24LR64E-R

Description	64-Kbit EEPROM with password protection, dual interface & energy harvesting: 400 kHz I²C bus & ISO 15693 RF protocol at 13.56 MHz

PDF	140 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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44 / 140 page

RF device operation

M24LR64E-R

44/140

Doc ID 022712 Rev 3

7.3

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 (M24LR64E-R) takes place as follows:

●

activation of the M24LR64E-R by the RF operating field of the VCD,

●

transmission of a command by the VCD,

●

transmission of a response by the M24LR64E-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).

7.3.1

Power transfer

Power is transferred to the M24LR64E-R by radio frequency at 13.56 MHz via coupling

antennas in the M24LR64E-R and the VCD. The RF operating field of the VCD is

transformed on the M24LR64E-R antenna to an AC voltage which is rectified, filtered and

internally regulated.

During communications, the amplitude modulation (ASK) on this received signal is

demodulated by the ASK demodulator.

7.3.2

Frequency

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

13.56 MHz ±7 kHz.

7.3.3

Operating field

The M24LR64E-R operates continuously between the minimum and maximum values of the

electromagnetic field H defined in Table 124. The VCD has to generate a field within these

limits.

M24LR64E-R Datasheet(PDF) 44 Page - STMicroelectronics