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Transmit signal from sensor OV2640 to 1.5m

Guillermo Maroto
Prodigy 150 points

Other Parts Discussed in Thread: DS90C124, DS90C241, DS90UR241

Good morning TI,

In our proyect we have to transmit one photo of the sensor OV2640 2Mpx (I've attached the detailed PIN) to 1.5 meters. Here is the problem , we can't transmit the signal directly, so I think I need a LVDS right?

I've never used before. Will I get the same signal? Which do you recomend me?

Any information would be highly appreciated.

Thank you

Pin nºNamePin nºNamePin nºName
1 NC 9 HSYNC 17 PCLK
2 AGND 10 DVDD 18 DATA6
3 SDA 11 DOVDD 19 DATA2
4 AVDD 12 DATA9 20 DATA5
5 SCL 13 MCLK 21 DATA3
6 RESET 14 DATA8 22 DATA4
7 VSYNC 15 AGND 23 DATA1
8 PWDN 16 DATA7 24 DATA0
  • 0
    Prodigy 150 points

    I've founded DS90C241/DS90C124  and DS90UR241Q/124Q. What is the difference between them? Will it works with the camera OV2640?

    Thank you

  • 0 in reply to Guillermo Maroto
    TI__Genius 14015 points

    Hi Guillermo,

    The main difference between the C and the UR parts is the UR parts will randomize the data that's sent over the serial link. This is helpful for emissions. Another difference is the maximum pixel clock rate, which is 35 MHz on the C parts and 43 MHz on the UR parts.

    What is your pixel clock rate? The parts you mentioned should work with that Omnivision sensor provided the pixel clock is within the recommended range. You would just ground the unused input pins.

    You could also look at the DS90UB913/914 if you wanted an I2C backchannel to communicate over. 

    Thanks!
    Jason Blackman

  • 0 in reply to Jason Blackman
    Prodigy 150 points

    Hi Jason,

    I decided to use DS90UR241/124 because the sensor OV2640 use 36Mhz pixel clock.

    I've copied the desgin of the Evaluation board(www.ti.com/tool/serdesur-43usb) and they don't work.

    I've attached my design and what I've done.

    1.- I've checked the intensity with 3.3V and is 10mA each.

    2.- I've verifed input clock and input data signals meet requirements for VILmin, VILmax, 

    VIHmin, VIHmax, tset, thold.

    3.-I've ground the unused pins in the serializer.

    Do you know what can it be? What should i have to do?

    Thanks, I hope your answer

     

  • 0 in reply to Guillermo Maroto
    Prodigy 40 points

    Hi,

    right now, I'm trying start up the camera OV2640, but  the camera doesn't work.

    I don't know if it's a power problem, if the camera is damage or if I'm missing something in the initialization of the camera.

    Voltage power suppy:

           AVDD =3V

           DVDD=1.3V

           DOVDD=3V

    AVDD and D0VDD are separated by R/C filter, as shown in "OV2640 Camera Module Hardware Application Notes".

    SCCB bus =1,8V

    XCLK=24MHz external oscillator.

    Initialization on OV2640:

         XCLK=active

          PWDR=low

         RESET=high

         SCCB_CLK=high

         SCCB_DATA=high

    After initialization, PCLK should be running, and HREF,VSYNC AND d[9:0] generate output, but that didn't happen.

    I also tried to read and write registers of the camera and it has been impossible.

    Could someone tell me if I'm doing something wrong or if the camera is damage. 
    The test I have done with several cameras.

    Thanks,

    Diana.