General Description

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 ure open-circuit LED fault-detection circuitry, as well as a watchdog timer.

Features

♦ 16 LED Current Sink Outputs (Two Banks of Eight Outputs)

♦ 32 LED Drive Option When Multiplexing

♦ 33MHz Clock Supports Up to 63 Frames per Second of Video

♦ Constant Output Current Calibration from 11mA to 55mA in 256 Steps

♦ EZCascade™ Interface Simplifies Multiple Driver Cascading Without External Buffers

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

♦ 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 Interface Fails

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