General Description

peripheral provides microprocessors with 16 I/O ports.

Each I/O port can be individually configured as either

an open-drain current-sinking output rated at 50mA and

5.5V, or a logic input with transition detection. A 17th

port can be used for transition detection interrupt, or as

a general-purpose output. The outputs are capable of

driving 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 with 14 intensity steps. Each output then has

individual 4-bit control, which further divides the global-

ly set current into 16 more steps. Alternatively, the cur-

rent control can be configured as a single 8-bit control

that sets all outputs at once.

The MAX7313 is pin and software compatible with the

MAX7311, PCA9535, and PCA9555.

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 MAX7313 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 MAX7313 is controlled through the 2-wire

Applications

LCD Backlights

LED Status Indication

Portable Equipment

Keypad Backlights

RGB LED Drivers

Notebook Computers

Features

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

♦ 2V to 3.6V Operation

♦ Overall 8-Bit PWM LED Intensity Control

Global 16-Step Intensity Control

Individual 16-Step Intensity Controls

♦ Two-Phase LED Blinking

♦ High Output Current (50mA max Per Port)

♦ Outputs are 5.5V-Rated Open Drain

♦ Supports Hot Insertion

♦ Inputs are Overvoltage Protected to 5.5V

♦ Transition Detection with Interrupt Output

♦ 1.2µA (typ), 3.6µA (max) Standby Current

♦ Small 4mm x 4mm Thin QFN Package

♦ -40°C to +125°C Temperature Range

♦ All Ports Can Be Configured as Inputs or Outputs

16-Port I/O Expander with LED Intensity

Control, Interrupt, and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products

1

TOP VIEW

THIN QFN

MAX7313ATG

19

20

21

22

12

3

4

5

6

18

17

16

15

14

13

23

24

12

11

10

9

8

7

SCL

V+

SDA

INT/O16

AD2

AD1

P10

P8

P9

GND

P6

P7

Pin Configurations

19-3059; Rev 4; 4/05

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.

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX7313ATG

-40

°C to +125°C

24 Thin QFN

4mm x 4mm

x 0.8mm

T2444-4

MAX7313AEG

-40

°C to +125°C 24 QSOP

—

Pin Configurations continued at end of data sheet.

Typical Application Circuit appears at end of data sheet.

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