M24LR04E-R datasheet(13/142 Pages) STMICROELECTRONICS

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M24LR04E-R

Description

Doc ID 022208 Rev 5

13/142

Description

The M24LR04E-R device is a dual-interface, electrically erasable programmable memory

(EEPROM). It features an I2C interface and can be operated from a VCC power supply. It is

also a contactless memory powered by the received carrier electromagnetic wave. The

M24LR04E-R is organized as 512 × 8 bits in the I2C mode and as 128 × 32 bits in RF mode.

The M24LR04E-R also features an energy harvesting analog output, as well as a user-

configurable digital output pin toggling during either RF write in progress or RF busy mode.

Figure 1.

Logic diagram

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 9th 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 M24LR04E-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). When connected to an

antenna, the operating power is derived from the RF energy and no external power supply is

required. The received ASK wave is 10% or 100% modulated with a data rate of 1.6 Kbit/s

VCC

M24LR04E-R

SCL

VSS

SDA

AC0

AC1

MS19765V1

Vout

RF WIP/

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