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Proteus Library for TLC5927

40902384
Prodigy 65 points
Other Parts Discussed in Thread: TLC5927

I'm trying the TLC5927 in controlling some RGB Leds but It seems that the Datasheet is quite ambiguous :(. Thus, I want to check my code and schematic before making PCB. Does anyone have the TLC5927 in Proteus to help me stimulate my Circuit? Thanks for help.

  • 0
    TI__Genius 14890 points

    Hi,

    Can you be a bit more specific about how the datasheet is ambiguous?  What is it that is not clear?  Perhaps we can help with the device operation theory.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 65 points

    Thanks a lot Mr.Dick.

    The first problem that I met is the differences between TLC5927 and the 74HC595 (i used to control Led matrix). I don't know how to use to TLC5927 to control the voltage of the Led and what is the use of the mode changing??? Can we use it to be more convenient while programming?

    Regards,

    Tan

  • 0 in reply to 40902384
    TI__Genius 14890 points

    Tan,

    The TLC5927 is a constant current LED Driver.  Choose a value for the REXT that will set the current on each of your outputs.  The LED voltage (VLED) is supplied externally and should be set to at least the LED Forward Voltage (VF) plus the Output Level (VOL) of the LED Driver.  For example.  If you set your REXT to 720 Ohms, your outputs will be sest to 26mA and your output voltage will be less than 0.6V. If your VF is 3.5V, you'd need to set the VLED to > 3.5V + 0.6V.  

    The MODE changing is used to change between "normal mode" and "Special mode".  Normal mode is the default condition and is used to enable writing to the LED outputs.  When data is written into the TLC5927 and latched, the outputs will turn off or on based on the data written (1 is ON, 0 is OFF).  This is, of course, depending on the state of OE (Low turns the enabled outputs on, high keeps them all off).  The special mode allows you to look for errors or to program a global brightness register (gain).  This allows you to choose different brightness levels without changing the REXT value.

    Let me know if this helps.

    Regards,

    Dick

  • 0 in reply to Dick Stacey
    Prodigy 65 points

    Thanks for your help, Dick. It's really helpful