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MAX7312

2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection

Maxim Integrated 

2-Wire-Interfaced 16-Bit I/O Port Expander

with Interrupt and Hot-Insertion Protection

AD0

I/O0

8 BIT

I/O1

I/O2

AD1

INPUT/OUTPUT

I/O3

PORT 1

I/O4

AD2

WRITE PULSE

I/O5

I/O6

READ PULSE

I/O7

SMBus

SCL

INPUT

CONTROL

SDA

FILTER

I/O8

8 BIT

I/O9

I/O10

INPUT/OUTPUT

I/O11

N

PORT 2

I/O12

WRITE PULSE

I/O13

I/O14

READ PULSE

I/O15

V+

POWER-ON

INT

RESET

MAX7312

GND

Figure 1. MAX7312 Block Diagram

SDA

tSU, DAT

tSU, STA

tLOW

tHD, DAT

tHD, STA

SCL

tBUF

tSU, STO

tHD, STA

tHIGH

tR

tF

START CONDITION

Figure 2. 2-Wire Serial Interface Timing Diagram

REPEATED START CONDITION

STOP CONDITION START CONDITION

Detailed Description

The MAX7312 general-purpose input/output (GPIO)

peripheral provides up to 16 I/O ports, controlled

through an I2C-compatible serial interface. The

MAX7312 consists of input port registers, output port

registers, polarity inversion registers, configuration reg-

isters, and a bus-timeout register. Upon power-on, all

I/O lines are set as inputs. Three slave ID address select

pins, AD0, AD1, and AD2, choose one of 64 slave ID

addresses, including the eight addresses supported by

the Phillips PCA9555. Table 1 is the register address

table. Tables 2–6 show detailed register information.

Serial Interface

Serial Addressing

The MAX7312 operates as a slave that sends and

receives data through a 2-wire 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). A master, typically a microcon-

troller, initiates all data transfers to and from the

MAX7312, and generates the SCL clock that synchro-

nizes the data transfer (Figure 2).

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