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Topics - lensfocus

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TFTs / NHD-7.0-800480EF-ATXV reset
« on: April 22, 2014, 02:07:16 PM »
Hello,

We have a new design and are using a NHD-7.0-800480EF-ATXV with a NHD-7.0-800480EF-34 Controller Board as an interface.

I got the display working fine  -- images look good --  using my processor's emulator / debugger.  Then I tried booting and running the board without the debugger, and the display did not work -- the backlight lit up but no images. So I realized that I had forgotten to use the hard reset line ( input pin 26 on the Controller board ), that pin had been floating.  However, when I now toggle the reset line (high - low - high) before starting TFT initialization, the screen does not work. I get different screen responses depending on how much time I leave between toggling the reset line and starting initialization.. I am leaving 250mS, that should be enough.. but no good images.  I am getting valid responses when reading registers from the 1963 controller.

The TFT data sheet specifies a power-up sequence that states that the reset line (RSTB) should be low when power is applied and go high after 1mS. Then is shows the AVDD line going high 10mS after that, but I have no control over the AVDD line.. Is this an issue? Is there anything else I can check?

Thanks very much!
Jeff

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