Rainbow-electronics MAX6970 User Manual download pdf

General Description

The MAX6970 serial-interfaced LED driver provides

eight open-drain, constant-current-sinking LED driver

outputs rated at 36V. The device operates from a 3V to

5.5V supply. The MAX6970 supply and the LEDs’ sup-

ply can power up in any order. The constant-current

outputs are programmed together up to 55mA using a

single external resistor. The MAX6970 operates with a

25Mbps, industry-standard, 4-wire serial interface.

The MAX6970 uses the industry-standard shift-register-

plus-latch-type serial interface. The driver accepts data

shifted into an 8-bit shift register using data input DIN

and clock input CLK. Input data appears at output

DOUT eight clock cycles later to allow cascading of

multiple MAX6970s. The latch-enable input, LE, loads

the 8 bits of shift register data into an 8-bit output latch

to set which LEDs are on and which are off. The output-

enable input, OE, gates all eight outputs on and off,

and is fast enough to be used as a PWM input for LED

intensity control.

For applications requiring LED fault detection, refer to

the MAX6981 data sheet that automatically detects

open-circuit LEDs.

For safety-related applications requiring a watchdog

timer, refer to the MAX6980 data sheet, which includes

a fail-safe feature that blanks the display if the serial

interface becomes inactive for more than 1s.

The MAX6970 is one of a family of 10 shift-register-plus-

latch-type LED drivers. The family includes 8-port and

16-port types, with 5.5V- or 36V-rated LED outputs, with

and without open-circuit LED detection and watchdog.

All versions operate from a 3V to 5.5V supply, and are

specified over the -40°C to +125°C temperature range.

Features

♦ 25Mbps Industry-Standard 4-Wire Serial Interface

at 5V

♦ 3V to 5.5V Logic Supply

♦ 8 Constant-Current LED Outputs Rated at 36V

♦ Up to 55mA Continuous Current per Output

♦ Output Current Programmed by Single Resistor

♦ 3% Current Matching Between Outputs

♦ 6% Current Matching Between ICs

♦ -40°C to +125°C Temperature Range

MAX6970

8-Port, 36V Constant-Current LED Driver

________________________________________________________________ Maxim Integrated Products 1

GND

V+

SET

DOUT

OUT7

OUT6

OUT5

OUT4

TOP VIEW

MAX6970

TSSOP/PDIP/SSOP

DIN

CLK

OUT1

OUT0

OUT2

OUT3

Pin Configuration

Ordering Information

XX-XXXX; Rev 0; 10/05

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.

Typical Application Circuit and Selector Guide appear at

end of data sheet.

Applications

Variable Message Signs

Marquee Displays

Point-of-Order Signs

Traffic Signs

Gaming Features

Architectural Lighting

PART TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX6970AUE -40°C to +125°C 16 TSSOP-EP* U16E-3

MAX6970APE -40°C to +125°C 16 PDIP A16-2

MAX6970AAE -40°C to +125°C 16 SSOP P16-1

*EP = Exposed pad.

Summary of Contents

Page 1 - Applications

General DescriptionThe MAX6970 serial-interfaced LED driver provideseight open-drain, constant-current-sinking LED driveroutputs rated at 36V. The dev

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Rainbow-electronics MAX6970 User Manual

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