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 active-low MUX0 and active-low 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.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
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MAX6974
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX6974ATL+
Active
TQFN;40 pin;37.2 mm²
Outline Drawing: 21-0141 (PDF)
Land Pattern: 90-0054 (PDF)
Use pkgcode/variation: T4066+3*
MAX6971 16-Port, 36V Constant-Current LED Driver MAX6979 16-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog MAX6969 16-Port, 5.5V Constant-Current LED Driver MAX6974, MAX6975 24-Output PWM LED Drivers for Message Boards MAX6960, MAX6961, MAX6962, MAX6963 4-Wire Serially Interfaced 8 x 8 Matrix Graphic LED Drivers
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