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MAX7315

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

Maxim Integrated 

19-3056; Rev 3; 1/05

EVAALVUAAILTAIOBNLEKIT

8-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

General Description

The MAX7315 I2C-/SMBus-compatible serial interfaced

peripheral provides microprocessors with 8 I/O ports.

Each I/O port can be individually configured as either an

open-drain current-sinking output rated at 50mA at 5.5V,

or a logic input with transition detection. A ninth port can

be used for transition detection interrupt or as a general-

purpose output. The outputs are capable of directly dri-

ving LEDs, or providing logic outputs with external

resistive pullup up to 5.5V.

PWM current drive is integrated with 8 bits of control.

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. Each output then has indi-

vidual 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.

The MAX7315 is pin and software compatible with the

PCA9534 and PCA9554(A).

Each output has independent blink timing with two blink

phases. All LEDs can be individually set to be on or off

during either blink phase, or to ignore the blink control.

The blink period is controlled by a register.

The MAX7315 supports hot insertion. All port pins, the INT

output, SDA, SCL, and the slave address inputs ADO-2

remain high impedance in power-down (V+ = 0V) with up

to 6V asserted upon them.

The MAX7315 is controlled through the 2-wire I2C/SMBus

serial interface, and can be configured to one of 64 I2C

addresses.

Applications

LCD Backlights

Keypad Backlights

LED Status Indication

RGB LED Drivers

Portable Equipment

Cellular Phones

Laptop Computers

Typical Application Circuit appears at end of data sheet.

Features

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

o 2V to 3.6V Operation

o Overall 8-Bit PWM LED Intensity Control

Global 16-Step Intensity Control

Plus Individual 16-Step Intensity Control

o Automatic Two-Phase LED Blinking

o 50mA Maximum Port Output Current

o Supports Hot Insertion

o Outputs Are 5.5V-Rated Open Drain

o Inputs Are Overvoltage Protected to 5.5V

o Transition Detection with Interrupt Output

o Low Standby Current (1.2µA typ; 3.3µA max)

o Tiny 3mm x 3mm, Thin QFN Package

o -40°C to +125°C Temperature Range

o All Ports Can Be Configured as Inputs or Outputs

Ordering Information

PART

TEMP

RANGE

PIN-

TOP PKG

PACKAGE MARK CODE

16 Thin QFN

MAX7315ATE -40°C to +125°C 3mm x 3mm AAU T1633-4

x 0.8mm

MAX7315AEE -40°C to +125°C 16 QSOP

—

—

MAX7315AUE -40°C to +125°C 16 TSSOP —

—

Pin Configurations

TOP VIEW

12 11 10 9

SDA 13

V+ 14

ADO 15

AD1 16

MAX7315ATE

8 P5

7 P4

6 GND

5 P3

1234

THIN QFN

Pin Configurations continued at end of data sheet.

________________________________________________________________ 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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