MAX6972 MAXIM [Maxim Integrated Products], MAX6972 Datasheet

MAX6972

Manufacturer Part Number

MAX6972

Description

16-Output PWM LED Drivers for Message Boards

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6972.pdf (23 pages)

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The MAX6972/MAX6973 precision current-sinking,

16-output PWM LED drivers drive red, green, and/or blue

LEDs for full-color graphic message boards and video

displays. Each output has an individual 12-bit (MAX6972)

or 14-bit (MAX6973) PWM-intensity (hue) control and

7-bit (MAX6972) or 5-bit (MAX6973) global PWM intensity

(luminance) control. The MAX6972/MAX6973 also fea-

ture open-circuit LED fault-detection circuitry, as well as

a watchdog timer.

The driver has two banks of eight outputs, with each bank

intended to drive a different color in RGB applications.

The standard application uses three MAX6972/

MAX6973s to drive eight RGB LEDs. The full-scale current

for each bank of eight outputs is adjustable from 11mA

to 55mA in 256 steps (0.3125% per step) to calibrate

each color.

The MAX6972/MAX6973 can optionally multiplex by

using outputs MUX0 and MUX1, which each drive an

external pnp transistor. Multiplexing doubles the

MAX6972/MAX6973 drive capability to 32 LEDs.

The MAX6972/MAX6973 operate from a 3.0V to 3.6V

power supply. The LED power supply can range from

3V to 7V. The LED drivers require only 0.8V headroom

above the LEDs’ forward-voltage drop. Using a sepa-

rate LED supply voltage for each LED minimizes power

consumption.

The serial interface uses differential signaling for the

high-speed clock and data signals to reduce EMI and

improve signal integrity. The MAX6972/MAX6973 buffer

all interface signals to simplify cascading devices in

modules that use a large number of drivers.

An internal watchdog timer, when enabled, automatically

clears the pixel-data registers and blanks the display if

any of the signal inputs fail to toggle within 40ms.

The MAX6972/MAX6973 are available in 32-pin TQFN

packages and operate over the -40°C to +125°C

temperature range.

Refer to the MAX6974/MAX6975 data sheet for a

24-output, 6mA to 30mA software-compatible device.

EZCascade is a trademark of Maxim Integrated Products, Inc.

19-0534; Rev 0; 5/06

Typical Operating Circuit appears at the end of data sheet.

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.

LED Video Display Panels

LED Message Boards

Variable Message Signs (VMS)

Signs

Graphic Panels

________________________________________________________________ Maxim Integrated Products

General Description

Applications

16-Output PWM LED Drivers

♦ 16 LED Current Sink Outputs (Two Banks of Eight

♦ 32 LED Drive Option When Multiplexing

♦ 33MHz Clock Supports Up to 63 Frames per

♦ Constant Output Current Calibration from 11mA

♦ EZCascade™ Interface Simplifies Multiple Driver

♦ 12-Bit or 14-Bit Individual PWM LED Intensity

♦ 7-Bit or 5-Bit Panel PWM-Intensity Control

♦ +3V to +7V LED Power Supply

♦ +3.0V to +3.6V Logic Supply

♦ Open-Circuit LED Fault Detection

♦ Optional Watchdog Timer Blanks Display if

♦ Standard -40°C to +125°C Operating Temperature

*EP = Exposed paddle.

+Denotes lead-free package.

MAX6972ATJ+

MAX6973ATJ+

Outputs)

Second of Video

to 55mA in 256 Steps

Cascading Without External Buffers

Controls

Interface Fails

Range

TOP VIEW

*EP = EXPOSED PADDLE.

PART

for Message Boards

-40°C to +125°C

TEMP RANGE

Ordering Information

5mm x 5mm

MAX6972ATJ

MAX6973ATJ

TQFN

Pin Configuration

32 TQFN-EP*

PIN-

PACKAGE

EP*

Features

16 Y7

15 Y6

T3255-5

CODE

PKG

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