MAX6964ATG+T【PDF 1/23 页】IC LED DRIVER LINEAR 24-TQFN

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Sheet目录341

[1页]2页 3页 4页 5页

19-3179; Rev 3; 3/05

ATION

AILABL

EVALU E

KIT

17-Output LED Driver/GPO with

Intensity Control and Hot-Insertion Protection

General Description

The MAX6964 I 2 C-compatible serial interfaced periph-

eral provides microprocessors with 17 output ports.

Each output is an open-drain current-sinking output

rated at 50mA and 7V. The outputs are capable of dri-

ving LEDs, or providing logic outputs with external

resistive pullup up to 7V.

Eight-bit PWM current control is also integrated. Four of

the 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. Additionally, each output

has an 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.

Each output has independent blink timing with two blink

phases. LEDs can be individually set to be either on or

off during either blink phase, or to ignore the blink con-

Features

? 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

? Two-Phase LED Blinking

? High Port Output Current—Each Port 50mA (max)

? RST Input Clears the Serial Interface and

Restores Power-Up Default State

? Supports Hot Insertion

? Outputs are 7V-Rated Open Drain

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

? Small 4mm x 4mm, 0.8mm High Thin QFN Package

? -40°C to +125°C Temperature Range

Ordering Information

trol. The blink period is controlled by an external clock

(up to 1kHz) on BLINK or by a register. The BLINK

input can also be used as a logic control to turn the

PART

TEMP RANGE

PIN-

PACKAGE

PKG CODE

LEDs on and off, or as a general-purpose input (GPI).

The MAX6964 supports hot insertion. The 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. The output ports remain high

24 Thin QFN

MAX6964ATG -40 ° C to +125 ° C 4mm x 4mm

x 0.8mm

MAX6964AEG -40 ° C to +125 ° C 24 QSOP

T2444-4

—

impedance with up to 8V asserted upon them.

The MAX6964 is controlled through a 2-wire I 2 C

serial interface, and can be configured to one of four

I 2 C addresses.

TOP VIEW

Pin Configurations

Applications

SCL 19

12 O10

LCD Backlights

LED Status Indication

Keypad Backlights

RGB LED Drivers

SDA 20

V+ 21

O16 22

MAX6964

11 O9

10 O8

9 GND

Typical Application Circuit at end of data sheet.

RST 23

AD0 24

8 O7

7 O6

QFN

Pin Configurations continued at end of data sheet.

________________________________________________________________ Maxim Integrated Products

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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