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DS90UB927Q-Q1: FPD Link tips for LCD display output which can be LVDS, RGB CMOS / TTL or HDMI (24 bit color depth)

Antonio Faggio
Expert 6840 points
Part Number: DS90UB927Q-Q1
Other Parts Discussed in Thread: DS90UB927Q, DS90UB928Q

Hi, 

My customer is evaluating the use of the FPD-link for the development of a new product in the agricultural sector, a plotter dashboard.

The idea is to create a blackbox that contains all the computational electronics to which an LCD display with Touch is connected.

Customer would like to use a single cable for the LCD-Touch connection to the black Box and hence the idea of ​​FPD-Link

On the display side we have a 1920x720 LCD with double LVDS channel and a capacitive touch panel with I2C interface
On the BB side we have a display output which can be LVDS, RGB CMOS / TTL or HDMI (24 bit color depth)

So on the BB side there would be an FPD-Link serializer that has an input of the LCD outputs listed above (LVDS RGB HDMI) in addition to the separate I2C channel

On the Display side we will need to have a deserializer with possibly LVDS output (since the LCD is LVDS) but if not possible also RGB CMOS / TTL

For LVDS input (BB side) and output (LCD side) I considered the DS90UB927q, DS90UB928q components.

For RGB input (BB side) and RGB output (LCD side) I considered the DS90UB925q, DS90UB926q components.

I don't know if they are "modular" type RGB input (BB) use DS90UB925q and LVDS output on LCD side use DS90UB928q

Please let me know what you think and if you have any other proposals on the matter

Thank you,

Antonio

  • 0
    TI__Mastermind 24415 points

    Hi Antonio,

    The devices you listed may be acceptable choices, however they all have a pixel clock range of 5 - 85MHz. You will need to verify the pixel clock of the display you are using is within that range ( PCLK = TotalHorizontalPixels*TotalVerticalPixels*FrameRate ).

    Regards,

    Ben Dattilo

  • 0 in reply to Ben Dattilo
    TI__Expert 6840 points

    Hi Ben,

    Ok thanks, after further investigation I think that the choice (almost obligatory) is for the pair DS90UB949 (HDMI input) and DS90UB948 (dual port LVDS output).

    The deserializer is forced by the fact that customer LCD is a cut FHD (1920x720 pixels) and has a double LVDS port (for odd and even lines). Each LVDS port is clocked at 44MHz

    To be used with the DS90UB948, I don't think there are many choices: customer processor can come out with RGB CMOS, HDMI or LVDS dual port, so they opted for HDMI. Please let me know if the considerations are right.

    I did not understand if in customer configuration they could use even a single twisted pair or two must be used mandatory.

    Can you please let me know?

    Thank you,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Mastermind 24415 points

    Hi Antonio,

    HDMI input for the 949 is acceptable, and the 948 output compatibility is LVDS. In this configuration, you can use a single twisted pair when in single mode.

    Regards,

    Ben Dattilo

  • 0 in reply to Ben Dattilo
    TI__Expert 6840 points

    Hi Ben,

    Ok thanks, what's the difference among 949, 949A and 949AS-Q1?

    Why customer should choose 949 and not the other 2 above variants (A and AS)?

    Thanks,

    Antonio

  • 0 in reply to Antonio Faggio
    TI__Mastermind 24415 points

    Hi Antonio,

    There is no 949AS-Q1. As for the 949 and 949A, the 949A is more expensive but is newer and can support a higher pixel clock, along with several other features and bug fixes. If the 949 does fit your need, it is the cheaper option.

    Regards,

    Ben