LED Drivers/LCD Bias

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TLC5941
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  • Forum Post: Greyscale clocking of the TLC5941

    Adrian Grindon
    I am using cascaded TLC5941s. The data sheet is not very clear about when you clock the greyscale data into it. Can you clock in the new data during the pwm cycle, ie while GSCLK is running? Or do you have to do it during the blanking period after the 4096 GSCLK pulses? I can't get it to work...
    on Sep 25, 2009

  • Forum Post: Clock distribution when cascading TLC5941

    Adrian Grindon
    We are having problems with cascading TLC5941's. We have 16 cascaded, but partway down the line they start getting incorrect data. This appears to be due to skewing of the clock pulse (which is just bussed to every part as shown in the data sheet). It doesn't take much distortion of the clock...
    on Oct 2, 2009

  • Wiki Page: TLC5941 - Power Pad

    Michael Day
    Q: TLC5941 - Power Pad by 10449 From Cyril Michailoff: For TLC5941, is it mandatory to connect the powerpad ? Answer: The power pad is not required for electrical functionality. However, the power pad connection is strongly recommended for thermal reasons. Note that the electrical ground connection...
    on Dec 18, 2009

  • Forum Post: Re: Supply Power for tlc5941

    Michael Day
    You can choose any voltage between 3.3V and 5V for the Vcc voltage. Note that the digital inputs determine if their input signal is a logic "1" or logic "0" based on the Vcc voltage. For example, a logic 0 is any voltage less than 0.2*Vcc. For the power pad, standard PWB reflow...
    on Jan 27, 2010

  • Wiki Page: TLC59401 vs TLC5941

    Michael Day
    Q: TLC59401 vs TLC5941 by 20072 Is the TLC5941 the same die as the TLC59401 ? I'm having difficulty finding any significant differences apart from the 59401 having a higher current at >3.6V and being about half the price ! Also, on the QFN, is it OK to tie the thermal pad down to GND. I'm...
    on Mar 26, 2010

  • Wiki Page: TLC5941, TLC5944 serial bus differencies

    Michael Day
    Q: TLC5941, TLC5944 serial bus differencies by 1090226 Hello, Can anyone tell me if there is a difference between the serial bus of the TLC5941 and TLC5944, if there is some? Thanks in advance, Kevin Stauder A: Re: TLC5941, TLC5944 serial bus differencies by 10449 The TLC5941 and TLC5944...
    on Apr 12, 2010

  • Forum Post: TLC5941-Q1 Pin Connections

    Patrick Feeny
    For the TLC5941-Q1, if several of the outputs on the I/C are unused, should these be "no connects" or do you need to do something else to those pins? Thanks in advance.
    on May 25, 2010

  • Forum Post: Re: TLC5941-Q1 Pin Connections

    Michael Day
    Unused TLC5941 outputs can be left open. They do not need to be connected. The unused outputs should be programmed to be off to minimize the quiescent current to the IC. Having an unused output disconnected but programmed to sink current increases the quiescsent current to the IC because the internal...
    on May 25, 2010

  • Forum Post: TLC5941 to MPU timing madness

    Chuck Begian
    Perhaps software engineers should not be put on hardware design projects. I am at my wits' end with this thing. Here is what I am trying to do... I have 4 TLC5941s cascaded to drive a dot-matrix LED display. The data for each row of the display is shifted into the TLC5941s, latched, and then...
    on Oct 15, 2010

  • Forum Post: Re: TLC5941 to MPU timing madness

    Brigitte
    Hello Chuck, Let me try to answer your questions: 1. Calculation is almost correct, just some time for XLAT and BLANK has to be there, which increases the data transfer speed. 2. The e xtra clock is just needed once after all bits are clocked through the 4 series parts. So for clocking in the...
    on Oct 19, 2010

  • Forum Post: Re: TLC5940 with no load

    Michael Day
    The TLC5940 is operating properly. If you have the output programmed to sink current, but the output is open, the IC trys harder and harder to turn on the internal FETs which results in higher input current to the IC. This will not damage the IC. If you want to reduce power consumption, program unused...
    on Dec 28, 2010

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

    Brigitte
    Hello Matthieu, Sorry, but the GSCLK is absolutely needed for this part. The part just turns on the outputs, if a GSCLK is connected. In addition, there are no default values for the gray scale register, therefore your connection will not work. Please have a look at TLC5947 which has 24 channels...
    on Feb 21, 2011

  • 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: Re: TLC59401/TLC5941 use without GSCLK

    Brigitte
    Hello Iko, What do you mean with reverse current in Vpwr? Do you mean that Vpwr increases its value because something in the system charges it? If this is correct, I do not see an issue as long as the voltage on the specific pin of our IC is above the absolute maximum rating. Best regards, Brigitte
    on Apr 13, 2011

  • Forum Post: Re: TLC5927 driving LEDs

    Brigitte
    Hello Daniele, Please check this application note http://www.ti.com/litv/pdf/slva267a . This note is using TLC5941, so it does not fit fully to TLC5927, but I hope it is at least of help for you. Best regards, Brigitte
    on Jul 5, 2011

  • Wiki Page: TLC5941 - TEST pin

    Michael Day
    Q: TLC5941 - TEST pin by 1754684 customer is replacing the TLC5946 with TLC5941 in his applications: the main difference I noted was the TEST Vs XHALF... because we want to save the PCB, the TEST pin would be driven by a MCU (since it was in the previous version - XHALF of TLC5941)... the question...
    on Oct 28, 2011

  • Forum Post: Re: TLC5941 XERR

    Brigitte
    Hello Andrew, When measuring XERR are you using the IC GND pin as reference? I just want to make sure that this is not a measurement problem. I can see some ringing on XERR even when just BLANK goes high and wonder if the GND connection of the probe is maybe somewhere far away from the IC GND pins...
    on Mar 26, 2012

  • Forum Post: Re: TLC5941 XERR

    Brigitte
    Hello Andrew, " Adding any of these caps moves the moment when XERR starts "acting up" to higher values ." What do you mean with this? For example, at 4.4 volts, 500mA (20mA per LED with 25 LEDs (2 chips)) XERR is high (except for the drop shown in the prior email) with a 100...
    on Mar 27, 2012

  • Forum Post: TLC5941 dying

    Andrew Stone
    Hi, I'm running a chain of TLC chips and I can get the FIRST chip to fail with some kind of internal short from VCC to GND pretty consistently. If I replace that chip, everything continues to work. It seems to me that the only difference between the first chip and the others is that the SIN is...
    on Jul 11, 2012

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