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DS92LV2422: Interface forum

Santhosh Poojary
Prodigy 10 points
Part Number: DS92LV2422
Other Parts Discussed in Thread: DS90UB947-Q1
1. Identified IC is DS92LV2422SQE/NOPB.
2. As per this data sheet the I2C lines are not connected - we would like to send Display touch data and Touch interrupt signal  - Is this possible in this IC?
3. Also what about the Display brightness control PWM signal - Is it possible to send Display backlight control PWM signal in this serializer, if yes please let us know the connection details.
4. If this IC is not supporting for Touch I2C and touch interrupt line transmission for longer length, then please suggest the alternate IC which supports Touch signal transmission along with serializer data.
5. Is there any Serializer and De serializer available for LVDS signal transmission over longer distances? If yes, please suggest the Part number.
6. Which type of cable and connectors are recommended for lossless transmission over long distances - Please suggest the part number for cable and connectors.
  • 0
    TI__Mastermind 19100 points

    Hi Santhosh,

    What is the goal for this setup? Are you just looking for an LVDS SERDES setup from transmitting video?

    For an LVDS setup, I would recommend looking at a DS90UB947 with a DS90UB948 setup, as this setup can take an LVDS input at the SER, and output LVDS at the deserializer.

    With this setup, you can cover longer distances, passthrough display touch and interrupt data, and send a PWM though the GPIO.

    As for cables and connectors over long distances, there are a few potential options and setups. Section 7.3.12.1 of the DS90UB948 datasheet details loss at certain cable lengths, how much loss the AEQ of the device can compensate for, as well as an example setup. Here are two pictures with our STP and coax recommendations: 

     

    Do you plan on generating a PWM from the serializer, or do you plan on passing one through?

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Prodigy 10 points

    Hi Ryan Kitto,

    Thank you so much for your suggestion. 

    Yes, I'm looking for an LVDS SERDES setup for transmitting video and all the associated signals.

    • Requirement is LVDS signal length need to be increased without any noise in the signal.
    • LCDS signal source is Main board - LVDS signal destination is LCD Daughter board and Display - In this case Display will be placed away from main board - so from main board to Display daughter board set we need to run a lengthy display cable without any signal distortion and keep minimum radiations.

    Below image is the Display Connector Signal details that needs to be transmitted over a long distance.

    I have following questions could you please help me.

    1. Any suggestion for 5V/3.3V supply and backlight supply line transmission over longer distances without any loss?

    2. What's the Part number of Single Lane/Link output in the DS90UB947-Q1 family.

    3. Is there any alternative part if cost is a concern in the design.

    4. Whether any signal condition circuitry/repeaters need to be placed in between for the long-distance transmission?

    Thanks, help would be appreciated.

    Santhosh


  • 0 in reply to Santhosh Poojary
    TI__Mastermind 19100 points

    Hi Santhosh,

    1.) We do recommend that a clean power supply providing power to device, but we do not have any guidance or suggestions for power over long distances.

    2.) The DS90UB947 is capable of single lane FPD-LINK output, and the DS90UB948 is capable of single lane FPD-LINK input.

    3.) If cost is a concern, you can look at the DS90UB925-Q1 and the DS90UB926-Q1. One thing to keep in mind is that these solutions may not have the same range as the DS90UB947-948.

    4.) As far as I am aware, we do not have any guidance for longer transmissions. Our devices are generally spec'd at 15 meters, but quality of cables and channel spec can have an impact, causing it to go shorter or longer distances.

    Additionally, I would like to note that I would recommend using an external generator for any PWM signals, as I believe our line of SERDES can only support PWM signal frequencies within the hundreds of Hz.

    Please let me know if you have any other questions.

    Thanks,

    Ryan