Rainbow-electronics MAX6973 User Manual

General DescriptionThe MAX6972/MAX6973 precision current-sinking, 16-output PWM LED drivers drive red, green, and/or blueLEDs for full-color graphic m

MAX6972/MAX6973Individual PWM ControlThe MAX6972/MAX6973 further modulate the time thateach subframe is ON by a pulse-width modulation(PWM) value. Eac

The global-intensity PDM value is set to 96DEC, producingan even distribution of ON subframes out of the 128 pos-sible (shown in Figure 4 as subframes

MAX6972/MAX6973Multiplexed vs. Nonmultiplexed OperationThe MAX6972/MAX6973 can double the number ofLEDs driven from 16 to 32 through multiplexing. Whe

Setting configuration bit D0 to 1 enables multiplexoperation. MUX0 and MUX1 alternate the LED anodedrive voltage between two sets of LEDs. The Y and

MAX6972/MAX6973CommandsThe MAX6972/MAX6973 have four commands used toload all operating mode and LED output current data.Each command is uniquely iden

The global-intensity data is received in an intermediateregister and is applied to the outputs at subframe 0 andPWM clock 0.The MAX6972/MAX6973 have o

MAX6972/MAX6973The serial interface uses the continuously runningclock, CLKI, to synchronously transfer and latch data(33MHz max). The MAX6972/MAX6973

through the cascaded devices. When LOADI is low, theMAX6972/MAX6973 continuously monitor DIN forreception of the SYNC pattern (see the HeaderSegment s

MAX6972/MAX6973Data SegmentThe bit length of the data segment received by theMAX6972/MAX6973 is dependent on the commandspecified in the header.The lo

Serial-Interface Cascade TimingThe MAX6972/MAX6973 serial-interface protocol timingis simplified by the guaranteed setup and hold charac-teristics of

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards2 _______________________________________________________________________________________ABS

MAX6972/MAX6973the 12-bit or 14-bit PWM data for each of the 16 outputs(see Figure 11). The various data segment bit lengthsfor each of the four comma

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards______________________________________________________________________________________ 21Pow

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards22 ______________________________________________________________________________________Pac

MAX6972/MAX697316-Output PWM LED Driversfor Message BoardsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely em

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards_______________________________________________________________________________________ 3Not

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards4 _______________________________________________________________________________________Typ

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards_______________________________________________________________________________________ 5Pin

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards6 _______________________________________________________________________________________MAX

MAX6972/MAX697316-Output PWM LED Driversfor Message Boards_______________________________________________________________________________________ 7MAX

MAX6972/MAX6973Detailed DescriptionThe MAX6972/MAX6973 drive 16 nonmultiplexed LEDsor 32 multiplexed LEDs for various indoor and outdoordisplay applic

LED Intensity ControlThe MAX6972/MAX6973 provide three levels of outputcurrent control for LED drive: calibration DACs(CALDACs), global-intensity cont