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MAX6974

Maxim Integrated Products
Part Number MAX6974
Manufacturer Maxim Integrated Products
Description (MAX6974 / MAX6975) 24-Output PWM LED Drivers
Published Dec 9, 2006
Detailed Description www.DataSheet4U.com 19-0555; Rev 0; 5/06 24-Output PWM LED Drivers for Message Boards General Description The MAX6974/...
Datasheet PDF File MAX6974 PDF File

MAX6974
MAX6974

Overview
www.
DataSheet4U.
com 19-0555; Rev 0; 5/06 24-Output PWM LED Drivers for Message Boards General Description 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 applications.
The full-scale current for each bank of eight outputs 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 separate 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.
EZCascade is a trademark of Maxim In...


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