Rainbow-electronics MAX6971 Bedienungsanleitung PDF herunterladen

General Description

The MAX6971 serial-interfaced LED driver provides 16

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

rated at 36V. The MAX6971 operates from a 3V to 5.5V

supply. The MAX6971 supply and the LEDs’ supply or

supplies can power up in any order. The constant-cur-

rent outputs are programmed together to up to 55mA

using a single external resistor. The MAX6971 operates

with a 25Mb, industry-standard, 4-wire serial interface.

The MAX6971 uses the industry-standard, shift-register-

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

shifted into a 16-bit shift register using data input DIN

and clock input CLK. Input data appears at the DOUT

output 16 clock cycles later to allow cascading of multi-

ple MAX6971s. The latch-enable input, LE, loads the 16

bits of shift register data into a 16-bit output latch to set

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

enable, OE, gates all 16 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 MAX6983*, which automatically detects open-circuit

LEDs.

For safety-related applications requiring a watchdog

timer, refer to the MAX6983, which includes a fail-safe

feature that blanks the display if the serial interface

becomes inactive for more than 1s.

The MAX6971 is one of a family of 12 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

♦ 25Mb, Industry-Standard, 4-Wire Serial Interface

♦ 3V to 5.5V Logic Supply

♦ 16 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

♦ High-Dissipation, 24-Pin Packages

♦ -40°C to +125°C Temperature Range

MAX6971

16-Port, 36V Constant-Current LED Driver

________________________________________________________________ Maxim Integrated Products 1

V+

SET

DOUT

OELE

CLK

DIN

GND

TOP VIEW

OUT15

OUT14

OUT13

OUT12OUT3

OUT2

OUT1

OUT0

OUT11

OUT10

OUT9

OUT8OUT7

OUT6

OUT5

OUT4

TSSOP/PDIP

MAX6971AUG

MAX6971ANG

Pin Configuration

Ordering Information

19-3808; Rev 0; 7/05

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

MAX6971AUG

-40°C to +125°C

24 TSSOP

MAX6971ANG

-40°C to +125°C

24 Narrow PDIP

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 11 12

Inhaltsverzeichnis

Seite 1 - Applications

General DescriptionThe MAX6971 serial-interfaced LED driver provides 16open-drain, constant-current-sinking LED driver outputsrated at 36V. The MAX697

Seite 2 - ELECTRICAL CHARACTERISTICS

MAX697116-Port, 36V Constant-Current LED Driver10 ______________________________________________________________________________________µCMOSIOUT0OUT1

Seite 3 - 5V TIMING CHARACTERISTICS

MAX697116-Port, 36V Constant-Current LED Driver______________________________________________________________________________________ 11TSSOP4.40mm.EP

Seite 4 - 3.3V TIMING CHARACTERISTICS

MAX697116-Port, 36V Constant-Current LED DriverMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a

Seite 5

MAX697116-Port, 36V Constant-Current LED Driver2 _______________________________________________________________________________________ABSOLUTE MAXIM

Seite 6 - Pin Description

MAX697116-Port, 36V Constant-Current LED Driver_______________________________________________________________________________________ 35V TIMING CHAR

Seite 7 - Detailed Description

MAX697116-Port, 36V Constant-Current LED Driver4 _______________________________________________________________________________________Typical Operat

Seite 8

MAX697116-Port, 36V Constant-Current LED Driver_______________________________________________________________________________________ 5Typical Operat

Seite 9 - Chip Information

MAX697116-Port, 36V Constant-Current LED Driver6 _______________________________________________________________________________________Pin Descriptio

Seite 10 - Selector Guide

Detailed DescriptionThe MAX6971 LED driver comprises a 4-wire serialinterface driving 16 constant-current-sinking, open-drain output ports. The output

Seite 11 - Package Information

MAX697116-Port, 36V Constant-Current LED Driver8 _______________________________________________________________________________________CLK is the ser

Seite 12 - PDIPN.EPS

Applications InformationSelecting External Component RSETto SetLED Output CurrentThe MAX6971 uses an external resistor, RSET, to set theLED current fo

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Inhaltsverzeichnis

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