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Tlc5940 schematic

Vadim Clement
Prodigy 70 points
Other Parts Discussed in Thread: TLC5940Hello, I come to your forum because I have some small issues with TLC5940. I just do my schematic but I am not sure of my connections. And also problems between the voltage differences with RGB LEDs. How to solve this problem? Here is my schematic and led caracteristics : http://forum.arduino.cc/index.php?PHPSESSID=vq3006mqgagc7h77ae1in7mhp1&action=dlattach;topic=214669.0;attach=68451 http://forum.arduino.cc/index.php?PHPSESSID=kuh920u2h0l01hihiegrrace05&action=dlattach;topic=214669.0;attach=68449 Sorry for my bad english (i'm french ^^) Thank you!
  • 0
    TI__Intellectual 1820 points

    Hello,

    Your sch is ok. One suggestion: VPRG should be provided by an I/O port of MCU, just like other control signal(SIN, SCLK, etc), because you need program both GS register and DC register before turn on LED.
    it's better to use another I/O port of MCU to control DCPRG, this will be convinient to switch between EEPROM and DC register when operation.
    To cover green/blue LED forward voltage range, suggest use 4V for VCC.  Consider only 30mA LED current, it's ok to connect cathod of red LED directly with OUTx pin. The power consumption inside 5940 is small.

    Thanks