M24LR04E-R datasheet(44/142 Pages) STMICROELECTRONICS

部件名	M24LR04E-R

功能描述	4-Kbit EEPROM with password protection, dual interface & energy harvesting: 400 kHz I²C bus & ISO 15693 RF protocol at 13.56 MHz

PDF	142 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

44 / 142 page

RF device operation

M24LR04E-R

44/142

Doc ID 022208 Rev 5

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 (M24LR04E-R) takes place as follows:

●

activation of the M24LR04E-R by the RF operating field of the VCD,

●

transmission of a command by the VCD,

●

transmission of a response by the M24LR04E-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 M24LR04E-R by radio frequency at 13.56 MHz via coupling

antennas in the M24LR04E-R and the VCD. The RF operating field of the VCD is

transformed on the M24LR04E-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 M24LR04E-R operates continuously between the minimum and maximum values of the

electromagnetic field H defined in Table 123. The VCD has to generate a field within these

limits.

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