PCF8574P datasheet(11/33 Pages) NXP

11 / 33 page

PCF8574_PCF8574A

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Product data sheet

Rev. 5 — 27 May 2013

11 of 33

NXP Semiconductors

PCF8574; PCF8574A

Remote 8-bit I/O expander for I2C-bus with interrupt

Characteristics of the I2C-bus

The I2C-bus is for 2-way, 2-wire communication between different ICs or modules. The

two wires 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 when connected to the output stages

of a device. Data transfer may be initiated only when the bus is not busy.

9.1 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 11).

9.1.1 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 12).

9.2 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 13).

Fig 11. Bit transfer

mba607

data line

stable;

data valid

change

of data

allowed

SDA

SCL

Fig 12. Definition of START and STOP conditions

mba608

SDA

SCL

STOP condition

START condition

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