PCA9549_2

© NXP B.V. 2009. All rights reserved.

Product data sheet

Rev. 02 — 13 July 2009

8 of 25

NXP Semiconductors

PCA9549

7.

lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be

connected to a positive supply via a pull-up resistor. Data transfer may be initiated only

when the bus is not busy.

7.1 Bit transfer

One data bit is transferred during each clock pulse. The data on the SDA line must remain

stable during the HIGH period of the clock pulse as changes in the data line at this time

will be interpreted as control signals (see Figure 8).

7.1.1 START and STOP conditions

Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW

transition of the data line while the clock is HIGH is defined as the START condition (S).

A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP

condition (P) (see Figure 9).

7.2 System configuration

A device generating a message is a ‘transmitter’; a device receiving is the ‘receiver’. The

device that controls the message is the ‘master’ and the devices which are controlled by

the master are the ‘slaves’ (see Figure 10).

Fig 8.

Bit transfer

mba607

data line

stable;

data valid

change

of data

allowed

SDA

SCL

Fig 9.

Definition of START and STOP conditions

mba608

SDA

SCL

P

STOP condition

S

START condition