ST25C04 datasheet(8/16 Pages) STMICROELECTRONICS

8 / 16 page

SCL

SDA

SCL

SDA

START

CONDITION

SDA

INPUT

SDA

CHANGE

AI00792

STOP

CONDITION

MSB

ACK

START

CONDITION

SCL

MSB

ACK

STOP

CONDITION

Figure 6. I2C Bus Protocol

Multibyte Write. For the Multibyte Write mode, the

MODE pin must be at VIH. The Multibyte Write

mode can be started from any address in the

memory. The master sends from one up to 4 bytes

of data, which are each acknowledged by the mem-

ory. The transfer is terminated by the master gen-

erating a STOP condition. The duration of the write

cycle is tW = 10ms maximum except when bytes

are accessed on 2 rows (that is have different

values for the 6 most significant address bits A7-

A2), the programming time is then doubled to a

maximum of 20ms. Writing more than 4 bytes in the

Multibyte Write mode may modify data bytes in an

adjacent row (one row is 8 bytes long). However,

the Multibyte Write can properly write up to 8

consecutive bytes as soon as the first address of

these 8 bytes is the first address of the row, the 7

following bytes being written in the 7 following bytes

of this same row.

Page Write. For the Page Write mode, the MODE

pin must be at VIL. The Page Write mode allows up

to 8 bytes to be written in a single write cycle,

provided that they are all located in the same ’row’

in the memory: that is the 5 most significant mem-

8/16

ST24/25C04, ST24/25W04

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