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MAX7316

10-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection

Maxim Integrated 

19-3055; Rev 3; 1/05

10-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

General Description

Features

The MAX7316 I2C/SMBus™-compatible serial interfaced

peripheral provides microprocessors with eight additional

I/O ports plus one output-only port and one input-only

port. Each I/O port can be individually configured as

either an open-drain current-sinking output rated to 50mA

at 5.5V or as a logic input with transition detection. The

output-only port can also be assigned as an interrupt out-

put for transition detection. The outputs are capable of

driving LEDs, or can provide logic outputs with external

resistive pullup up to 5.5V.

Eight-bit PWM current control is available for all nine out-

put ports. Four bits are global control and apply to all LED

outputs to provide coarse adjustment of current from fully

off to fully on in 14 intensity steps. Additionally each out-

put then has individual 4-bit control, which further divides

the globally set current into 16 more steps. Alternatively,

the current control can be configured as a single 8-bit

control that sets all outputs at once.

♦ 400kbps, 2-Wire Serial Interface, 5.5V Tolerant

♦ 2V to 3.6V Operation

♦ Overall 8-Bit PWM LED Intensity Control

Global 16-Step Intensity Control

Plus Individual 16-Step Intensity Controls

♦ 2-Phase LED Blinking

♦ High Output Current (50mA max per Port)

♦ Supports Hot Insertion

♦ Outputs are 5.5V-Rated Open Drain

♦ Inputs are Overvoltage Protected to 5.5V

♦ Transition Detection with Interrupt Output

♦ RST Input Clears Serial Interface and Restores

Power-Up Default State

♦ Low Standby Current (1.2µA (typ), 3.3µA (max))

♦ Small 3mm x 3mm, Thin QFN Package

♦ -40°C to +125°C Temperature Range

Each output has independent blink timing with two blink

phases. LEDs can be individually set to be on or off dur-

ing either blink phase or to ignore the blink control. The

blink period is controlled by an external clock input (up to

1kHz) on BLINK or by a register. The BLINK input can

also be used as a logic control to turn the LEDs on and

off, or as a general-purpose input.

The MAX7316 supports hot insertion. All port pins, the

INT output, SDA, SCL, RST, BLINK, and the slave

address input ADO remain high impedance in power-

down (V+ = 0V) with up to 6V asserted upon them.

Ordering Information

PART

TEMP

RANGE

PIN-

TOP PKG

PACKAGE MARK CODE

16 Thin QFN

MAX7316ATE -40°C to +125°C 3mm x 3mm AAV T1633-4

x 0.8mm

MAX7316AEE -40°C to +125°C 16 QSOP

—

—

Typical Application Circuit

5V

The MAX7316 is controlled through a 2-wire serial inter-

face, and can be set to one of four I2C addresses.

Applications

LCD Backlights

Keypad Backlights

3.3V

0.047μF

LED Status Indication

RGB LED Drivers

Relay Drivers

System I/O Ports

Pin Configurations

TOP VIEW

12 11 10 9

SDA 13

8 P5

μC

SDA

SCL

I/O

I/O

INT

V+

P0

P1

SDA MAX7316 P2

SCL

P3

BLINK

RST

INT/O8

AD0

P4

P5

P6

GND

P7

INPUT 1

INPUT 2

INPUT 3

5V

V+ 14

BLINK 15

MAX7316ATE

7 P4

6 GND

OUTPUT 1

RST 16

5 P3

1234

SMBus is a trademark of Intel Corp.,

oa

l-

ne

THIN QFN

Pin Configurations continued at end of data sheet.

I.

S.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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