4.4

Acknowledge bit (ACK)

The acknowledge bit is used to indicate a successful byte transfer. The bus transmitter, whether it be bus master

or slave device, releases serial data (SDA) after sending eight bits of data. During the ninth clock pulse period,

the receiver pulls serial data (SDA) low to acknowledge the receipt of the eight data bits.

4.5

Device addressing

To start communication between the bus master and the slave device, the bus master must initiate a Start

condition. Following this, the bus master sends the device select code, shown in not Table 2 (most significant bit

first).

Table 2. Device select code

Device type identifier(1)

Chip enable address

RW

b7

b6

b5

b4

b3

b2

b1

b0

1

0

1

0

A10

A9

A8

RW

1. The most significant bit, b7, is sent first.

The eighth bit is the Read/Write bit (R/W), set to 1 / 0, respectively, for Read / Write operations.

If a match occurs on the device select code, the corresponding device gives an acknowledgement on serial data

(SDA) during the ninth bit time. If the device does not match the device select code, it deselects itself from the

bus, and goes into standby mode.

M24C16-W M24C16-R M24C16-F

Acknowledge bit (ACK)

DS9194 - Rev 11

page 7/40