M14C16-WS4X View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M14C16-WS4X

Memory Card IC 16/4 Kbit Serial I²C Bus EEPROM

STMicroelectronics 

M14C16, M14C04

Figure 4. I2C Bus Protocol

SCL

SDA

START

CONDITION

SDA

SDA

INPUT CHANGE

STOP

CONDITION

SCL

SDA

1

2

3

MSB

START

CONDITION

7

8

9

ACK

SCL

1

2

3

7

8

9

SDA

MSB

ACK

STOP

CONDITION

AI00792

Write Operations

Following a START condition the master sends a

Device Select code with the RW bit set to ’0’, as

shown in Table 4. The memory acknowledges it

and waits for a byte address, which provides ac-

cess to the memory area. After receipt of the ad-

dress, the memory again responds with an

acknowledge and waits for the data byte. Writing

in the memory may be inhibited if input pin WC is

taken high.

Any write command with WC=1 (during a period of

time from the START condition until the end of the

address) will not modify the memory content and

will NOT be acknowledged on data bytes, as

shown in Figure 5.

Table 3. Device Select Code 1

Device Code

Chip Enable

RW

b7

b6

b5

b4

b3

b2

b1

b0

M14C16 Select

1

0

1

0

A10

A9

A8

RW

M14C04 Select

1

0

1

0

0

0

Note: 1. A10, A9 and A8 correspond to the most significant bits of the memory array address word.

A8

RW

4/13

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