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    Help Configuring TW2837 video Quad MUX using atmega32u4

    I am having trouble in getting desired output from the TW2837 Video Mux chip. I have used atmga32u4 as a host controller. I am able to get four blue screens on TV separated by boundary lines.I am also able to generate the color bar test pattern. However when I connect a camera on any of the four input channels the respective display is just noisy, scrambled, running lines. I don't know what else to do ? if anyone has implemented it please help ! or share your experience.

    •   Alt11th January 2017, 18:25

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  2. #2
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    Re: Help Configuring TW2837 video Quad MUX using atmega32u4

    you should probably describe the circuit connection between the camera (also give the camera part number) and the TW2837. I suspect you've got something connected wrong or are missing something in the way you are connecting them.



    •   Alt11th January 2017, 18:42

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    Re: Help Configuring TW2837 video Quad MUX using atmega32u4

    Actually the Video signal from camera entering into the input pin of TW2837 is absolutely fine (TV displays it perfect when i hook up wires from input pins TW2837. it means the input side is working fine ) the application schematic has been taken from data sheet as attached.Click image for larger version. 

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    •   Alt12th January 2017, 18:20

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  4. #4
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    Re: Help Configuring TW2837 video Quad MUX using atmega32u4

    Hi,

    * PCB layout problems?
    * missing power supply decoupling capacitors?

    ****
    * are the supply voltages stable all the time?


    Klaus



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