DatasheetsPDF.com

MAX6973 Dataheets PDF



Part Number MAX6973
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description (MAX6972 / MAX6973) 16-Output PWM LED Drivers
Datasheet MAX6973 DatasheetMAX6973 Datasheet (PDF)

19-0534; Rev 0; 5/06 KIT ATION EVALU E L B A IL AVA 16-Output PWM LED Drivers for Message Boards 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 .

  MAX6973   MAX6973



Document
19-0534; Rev 0; 5/06 KIT ATION EVALU E L B A IL AVA 16-Output PWM LED Drivers for Message Boards 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 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 feature 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 www.DataSheet4U.com 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 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. MAX6972/MAX6973 Ordering Information PART MAX6972ATJ+ MAX6973ATJ+ TEMP RANGE -40°C to +125°C -40°C to +125°C PINPACKAGE 32 TQFN-EP* 32 TQFN-EP* PKG CODE T3255-5 T3255-5 *EP = Exposed paddle. +Denotes lead-free package. Pin Configuration DOUT+ CLKO+ VDD 17 16 EP* 15 14 13 Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 12 11 10 9 1 VDD 2 MUX0 3 CLKI+ 4 CLKI5 DIN+ 6 DIN7 LOADI 8 I.C. TOP VIEW 24 Z7 25 Z6 26 Z5 27 Z4 28 Z3 29 Z2 30 Z1 31 Z0 32 23 22 21 20 19 18 MAX6972ATJ MAX6973ATJ Applications LED Video Display Panels LED Message Boards Variable Message Signs (VMS) Signs Graphic Panels Typical Operating Circuit appears at the end of data sheet. + *EP = EXPOSED PADDLE. TQFN 5mm x 5mm ________________________________________________________________ Maxim Integrated Products LOAD0 DOUT- CLKO- MUX1 AGND 1 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. 16-Output PWM LED Drivers for Message Boards MAX6972/MAX6973 ABSOLUTE MAXIMUM RATINGS (All voltages with respect to GND.) VDD ........................................................................-0.3V to +4.0V Y0–Y7, Z0–Z7, MUX0, and MUX1 .........................-0.3V to +8.0V All Other Pins..............................................-0.3V to (VDD + 0.3V) Continuous Power Dissipation (TA = +70°C) 32-Pin TQFN (derate 34.5mW/°C over +70°C) ..........2857mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VDD = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = 3.3V, TA = +85°C.) (Note 1) PARAMETER Operati.


MAX6972 MAX6973 MAX6978


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)