LED Drivers/LCD Bias

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LED Drivers/LCD Bias

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GSCLK
Related Posts

  • Forum Post: Re: TLC59401/TLC5941 use without GSCLK

    Brigitte
    Hello Iko, What do you mean with "if the generation of GSCLK is stopped"? Do you mean you stop for a while to keep the outputs on for longer than in general? How long is this while? What do you want to achieve with stopping the GSCLK? Why not just making the GSCLK slower? Best regards...
    on Feb 23, 2011

  • Forum Post: Re: TLC59401/TLC5941 use without GSCLK

    Michael Day
    You are correct that if you stop applying a clock signal to the tLC5941 (TLC5940) GSCLK pin, the internal counter does not count and the outputs remain fixed and do not change. Note that if you pull BLANK high, the outputs turn off and the internal counter is reset. You can not turn the outputs on again...
    on Feb 23, 2011

  • Forum Post: Re: TLC59401/TLC5941 use without GSCLK

    Brigitte
    Hello Iko, Do I understand right that you initialize greyscale with all outputs on? How are you doing this? After startup the values in the grayscale register are random and therefore I wonder how you turn on all outputs at the same time. If your initialization works fine and you are able to turn...
    on Mar 30, 2011

  • Forum Post: Application for dimming white LEDs on multiple channels

    Todd Larson
    I have an application for dimming white LEDs on multiple channels. I have tried using the TLC5940 with 16 channels with dot correction and grayscale PWM with some success. Generating the GS clock is messy at best. If a 25MHz internal oscillator was provided for the GS clock, this would be a nearly perfect...
    on Apr 12, 2011

  • Forum Post: Using TLC59401 without PWM and with minimum of control signals.

    Catalin Cristea
    Hello, My problem may be similar to the" use without GSCLK " post. I can't use PWM for EMI reasons, so I will use the Dot Correction mode to change LED brightness. I don't have a lot of spare GPIO so I'd like to minimize the control pins to minimum necessary, I thought...
    on Apr 7, 2011

  • Forum Post: Re: TLC 5940: Why LED intensity decrease when generate BLANK signal every 4096 pulses?

    Brigitte
    Hello Pedro, What did you program in the gray-scale (GS) and the dot correction (DC) registers? Whenever BLANK is toggled, the GS counter is reset and a GS cycle starts from the beginning. Therefore the LEDs will be on for a longer portion of one GS cycle when the cycle is just 256 pulses long...
    on Oct 6, 2011

  • Forum Post: Re: Single flash from TLC5940 - PIC18F assembly from flow chart

    Brigitte
    Hello Michael, I wonder if you are using the GSCLK input, because you do not mention it. Is your PIC as well generating the GSCLK? If yes, what is the speed of this clock? If you could send a schematic of your system, it might be easier to give more detailed answers. Best regards, Brigitte
    on Jan 18, 2012

  • Forum Post: Re: LED Driver TLC5945 Clarification

    Brigitte
    Hello Vini, When the voltage on the OUTx pins will go higher than 3V, the current will still be regulated but the lower you keep the voltage on OUTx (but above the break of slope in Figure 5) the more accurate will be the current regulation. You just have to be careful with the power dissipation inside...
    on Feb 10, 2012

  • Forum Post: Re: LED Driver TLC5945 Clarification

    Brigitte
    Hello Vini, Let me try to clarify your GSCLK questions: As per my understanding, after 4096 GSCLK cycles, PWM stops and all the channels are OFF, even if BLANK is kept LOW continuously. And I need to give a small pulse on BLANK restart a PWM cycle. I will change PWM value every ~33ms and I am...
    on Feb 14, 2012

  • Forum Post: Re: LED Driver TLC5945 Clarification

    Brigitte
    Hello Vini, Normally the application should work without problems with any GSCLK. We did not observe any issues with an asynchronous clock up to now. 1. Is the GSCLK from the same MCU as the BLANK signal? 2. and 3. I do not have an explanation for this behavior. Would it be possible that...
    on Mar 6, 2012

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