MAX6975 Maxim Integrated Products, MAX6975 Datasheet

MAX6975

Manufacturer Part Number

MAX6975

Description

(MAX6974 / MAX6975) 24-Output PWM LED Drivers

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX6975.pdf (23 pages)

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H&T Electronics

Part Number:

MAX6975ATL+

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The MAX6974/MAX6975 precision current-sinking,

24-output PWM LED drivers drive red, green, and blue

LEDs for full-color graphic message boards and video

displays. Each output has an individual 12-bit (MAX6974)

or 14-bit (MAX6975) PWM-intensity (hue) control and

7-bit (MAX6974) or 5-bit (MAX6975) global PWM intensity

(luminance) control. The MAX6974/MAX6975 feature a

high-speed, fully buffered cascadable serial interface,

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

watchdog timer.

The driver has three banks of eight outputs, with each

bank intended to drive a different color in RGB applica-

tions. The full-scale current for each bank of eight out-

puts is adjustable from 6mA to 30mA in 256 steps

(0.3125% per step) to calibrate each color.

The MAX6974/MAX6975 can optionally multiplex by

using outputs MUX0 and MUX1, which each drive an

external pnp transistor. Multiplexing doubles the

MAX6974/MAX6975 drive capability to 48 LEDs.

The MAX6974/MAX6975 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 MAX6974/MAX6975 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 MAX6974/MAX6975 are available in 40-pin TQFN

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

temperature range.

Refer to the MAX6972/MAX6973 data sheet for a

16-output, 11mA to 55mA software-compatible device.

19-0555; Rev 0; 5/06

EZCascade is a trademark of Maxim Integrated Products, Inc.

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

24-Output PWM LED Drivers

o 24 LED Current Sink Outputs (Three Banks of

o 48 LED Drive Option When Multiplexing

o 33MHz Clock Supports Up to 63 Frames per

o Constant Output Current Calibration from 6mA to

o EZCascade™ Interface Simplifies Multiple Driver

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

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

o +3V to +7V LED Power Supply

o +3.0V to +3.6V Logic Supply

o Open-Circuit LED Fault Detection

o Optional Watchdog Timer Blanks Display if

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

* EP = Exposed pad.

+ Denotes lead-free package.

MAX6974ATL+

MAX6975ATL+

Eight Outputs)

Second of Video

30mA in 256 Steps

Cascading Without External Buffers

Controls

Interface Fails

Range

TOP VIEW

*EP = EXPOSED PADDLE.

PART

for Message Boards

AGND

-40°C to +125°C 40 TQFN-EP*

TEMP RANGE

Ordering Information

MAX6974ATL/

MAX6975ATL

TQFN-EP

Pin Configuration

PIN-

PACKAGE

24 23 22

EP*

Features

20 G4

T4066-3

CODE

PKG

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