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SN75LVDS82: Small size 3.7" VGA LCD

GARETH OU
Guru 11995 points

Part Number: SN75LVDS82

Hi

could you help to confirm whether the SN75LVDS82 can support the attached panel?

panel spec.pdf

  • 0
    TI__Intellectual 2825 points

    Hi Gareth,

    I am looking into this and will let you know tomorrow (6/14/22).

    Best,
    Corinne

  • 0
    TI__Intellectual 2825 points

    Hey Gareth,

    To determine if the device would support the panel you need to find the required PCLK by the panel with the following equation:

    PCLK = (Hactive + Hblanking) * (Vactive + Vblanking) * (Frame rate)
    PCLK = (480 + Hblanking) * (800 + Vblanking) * (60 Hz)

    In this case I would recommend that you confirm with the panel manufacturer what the max horizontal and vertical total pixel count is because based on the below screenshot from the spec you provided it appears highly variable. Depending on what you find out the SN75LVDS82 will support this panel as long as the PCLK you calculate is greater than 31 MHz.

    Active Pixels:

    Blanking:

    Please let me know if you have any other questions!

    Best,
    Corinne

  • 0 in reply to Corinne Meyers
    Guru 11995 points

    Hey Corinne

    Thanks for the detailed explanation

    Panel's RGB is only 5 BIT

    IC's OUTPUT has 8 BIT

    How should the sequence be connected?Thanks

  • 0 in reply to GARETH OU
    TI__Intellectual 2825 points

    Hey Gareth,

    After looking into the panel spec a little more thoroughly it looks like it is a 565 configuration where it requires 5 red bits, 6 green bits, and 5 blue bits.

    These will be mapped to specific data pins in the SN75LVDS82 but how it is connected depends on the format of the LVDS output that is being connected to the SN75LVDS82 input. The chart below shows the formats supported by the SN75LVDS82 device, can you find out which one matches the LVDS output that you are converting to RGB? Once we figure out the appropriate mapping based on the LVDS format, you will just leave some of the 8 bit output for each color disconnected.