MAX7325AEG+ datasheet(11/17 Pages) MAXIM

Part #	MAX7325AEG+

Description	I2C Port Expander with 8 Push-Pull and 8 Open-Drain I/Os

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Manufacturer	MAXIM [Maxim Integrated Products]

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MAX7325

I2C Port Expander with 8 Push-Pull

and 8 Open-Drain I/Os

11

Maxim Integrated

Acknowledge

The acknowledge bit is a clocked 9th bit the recipient

uses to acknowledge receipt of each byte of data

(Figure 4). Each byte transferred effectively requires 9

bits. The master generates the 9th clock pulse, and the

recipient pulls down SDA during the acknowledge

clock pulse, such that the SDA line is stable low during

the high period of the clock pulse. When the master is

transmitting to the MAX7325, the device generates the

acknowledge bit because the MAX7325 is the recipi-

ent. When the MAX7325 is transmitting to the master,

the master generates the acknowledge bit because the

master is the recipient.

Slave Address

Each MAX7325 has two different 7-bit slave addresses

(Tables 2 and 3). The addresses are different to communi-

cate to either the eight push-pull outputs or the eight I/Os.

The 8th bit of the slave address following the 7-bit slave

address is the R/W bit. It is low for a write command, and

high for a read command (Figure 5). The first (A6), sec-

ond (A5), and third (A4) bits of the MAX7325 slave

address are always 1, 1, and 0 (P0–P7) or 1, 0, and 1

(O8 to O15). Connect AD0 and AD2 to GND, V+, SDA,

or SCL to select the slave address bits A3, A2, A1, and

A0. The MAX7325 has 16 possible pairs of slave

addresses (Tables 2 and 3), allowing up to 16

MAX7325 devices on an I2C bus.

Accessing the MAX7325

The MAX7325 is accessed though an I2C interface. The

MAX7325 has two different 7-bit slave addresses for

either the eight open-drain I/O ports (P0–P7) or the

eight push-pull ports (O8–O15). See Tables 2 and 3.

A single-byte read from the I/O ports (P0–P7) of the

MAX7325 returns the status of the eight I/O ports and

clears both the internal transition flags and the INT out-

put when the master acknowledges the slave address

byte. A single-byte read from the eight push-pull ports

(O8–O15) returns the status of the eight output ports,

read back as inputs.

A 2-byte read from the I/O ports (P0–P7) of the

MAX7325 returns the status of the eight I/O ports (as for

a single-byte read), followed by the transition flags.

Again, the internal transition flags and the INT output

are cleared when the master acknowledges the slave

address byte, yet the previous transition flag data is

sent as the second byte. A 2-byte read from the push-

pull ports of the MAX7325 repeatedly returns the status

of the eight output ports, read back as inputs.

A multibyte read (more than 2 bytes before the I2C

STOP bit) from the I/O ports (P0–P7) of the MAX7325

repeatedly returns the port data, followed by the transi-

tion flags. As the port data is resampled for each trans-

mission, and the transition flags are reset each time, a

multibyte read continuously returns the current data

and identifies any changing input ports.

SCL

SDA BY

TRANSMITTER

CLOCK PULSE

FOR ACKNOWLEDGEMENT

START

CONDITION

SDA BY

RECEIVER

12

89

S

Figure 4. Acknowledge

SDA

SCL

A5

MSB

LSB

ACK

A4

A1

A3

A0

A2

R/W

Figure 5. Slave Address

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MAX7325AEG+ Datasheet(PDF) 11 Page - Maxim Integrated Products

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