MAX7324AEG+ datasheet(10/18 Pages) MAXIM

Part #	MAX7324AEG+

Description	I2C Port Expander with Eight Push-Pull Outputs and Eight Inputs

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Manufacturer	MAXIM [Maxim Integrated Products]

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Serial Interface

Serial Addressing

The MAX7324 operates as a slave that sends and

receives data through an I2C interface. The interface uses

a serial-data line (SDA) and a serial-clock line (SCL) to

achieve bidirectional communication between master(s)

and slave(s). The master initiates all data transfers to

and from the MAX7324 and generates the SCL clock that

synchronizes the data transfer (Figure 1).

SDA operates as both an input and an open-drain output.

A pullup resistor, typically 4.7kΩ, is required on SDA.

SCL operates only as an input. A pullup resistor, typically

4.7kΩ, is required on SCL if there are multiple masters

on the 2-wire interface, or if the master in a single-master

system has an open-drain SCL output.

Each transmission consists of a START condition sent by

a master, followed by the MAX7324's 7-bit slave address

plus R/W bit, 1 or more data bytes, and finally a STOP

condition (Figure 2).

Start and Stop Conditions

Both SCL and SDA remain high when the interface is not

busy. A master signals the beginning of a transmission

with a START (S) condition by transitioning SDA from high

to low while SCL is high. When the master has finished

communicating with the slave, the master issues a STOP

(P) condition by transitioning SDA from low to high while

SCL is high. The bus is then free for another transmission

(Figure 2).

Bit Transfer

One data bit is transferred during each clock pulse.

The data on SDA must remain stable while SCL is high

(Figure 3).

Figure 3. Bit Transfer

Figure 2. Start and Stop Conditions

Figure 1. 2-Wire Serial-Interface Timing Details

SDA

SCL

DATALINE STABLE;

DATAVALID

CHANGE OF DATA

ALLOWED

SDA

SCL

START

CONDITION

STOP

CONDITION

S

P

SCL

SDA

tR

tF

tBUF

START

CONDITION

STOP

CONDITION

REPEATED START CONDITION

START CONDITION

tSU,STO

tHD,STA

tSU,STA

tHD,DAT

tSU,DAT

tLOW

tHIGH

tHD,STA

www.maximintegrated.com

Maxim Integrated │ 10

MAX7324

I2C Port Expander with

Eight Push-Pull Outputs and Eight Inputs

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