M24LR64-RDW6T-2 Datasheet, PDF (12/121 Pages) STMicroelectronics – Dynamic NFC/RFID tag IC with 64-Kbit EEPROM with I²C bus and ISO 15693 RF interface

Description
1
Description
M24LR64-R
The M24LR64-R device is a Dynamic NFC/RFID tag IC with a dual-interface, electrically
erasable programmable memory (EEPROM). It features an I²C interface and can be
operated from a V_CC power supply. It is also a contactless memory powered by the received
carrier electromagnetic wave. The M24LR64-R is organized as 8192 × 8 bits in the I²C
mode and as 2048 × 32 bits in the ISO 15693 and ISO 18000-3 mode 1 RF mode.
Figure 1. Logic diagram
VCC
2
E0-E1
SCL
M24LR64-R
SDA
AC0
AC1
VSS
AI15106b
I²C uses a two-wire serial interface, comprising a bidirectional data line and a clock line. The
devices carry a built-in 4-bit device type identifier code (1010) in accordance with the I²C
bus definition.
The device behaves as a slave in the I²C protocol, with all memory operations synchronized
by the serial clock. Read and Write operations are initiated by a Start condition, generated
by the bus master. The Start condition is followed by a device select code and Read/Write
bit (RW) (as described in Table 2), terminated by an acknowledge bit.
When writing data to the memory, the device inserts an acknowledge bit during the 9^th bit
time, following the bus master’s 8-bit transmission. When data is read by the bus master,
the bus master acknowledges the receipt of the data byte in the same way. Data transfers
are terminated by a Stop condition after an Ack for Write, and after a NoAck for Read.
In the ISO15693/ISO18000-3 mode 1 RF mode, the M24LR64-R is accessed via the
13.56 MHz carrier electromagnetic wave on which incoming data are demodulated from the
received signal amplitude modulation (ASK: amplitude shift keying). The received ASK
wave is 10% or 100% modulated with a data rate of 1.6 Kbit/s using the 1/256 pulse coding
mode or a data rate of 26 Kbit/s using the 1/4 pulse coding mode.
Outgoing data are generated by the M24LR64-R load variation using Manchester coding
with one or two subcarrier frequencies at 423 kHz and 484 kHz. Data are transferred from
the M24LR64-R at 6.6 Kbit/s in low data rate mode and 26 Kbit/s high data rate mode. The
M24LR64-R supports the 53 Kbit/s in high data rate mode in one subcarrier frequency at
423 kHz.
The M24LR64-R follows the ISO 15693 and ISO 18000-3 mode 1 recommendation for
radio-frequency power and signal interface.
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