M24C64-R datasheet(6/39 Pages) STMICROELECTRONICS

6 / 39 page

Description

M24128, M24C64, M24C32

6/39

Description

The M24C32, M24C64 and M24128 devices are I2C-compatible electrically erasable

programmable memories (EEPROM). They are organized as 4096 × 8 bits, 8192 × 8 bits

and 16384 × 8 bits, respectively.

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 3), 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.

AI01844e

E0-E2

SDA

VCC

M24128

M24C64

M24C32

SCL

VSS

M24C64-R 数据表(PDF) 6 Page - STMicroelectronics