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ChristyZ

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Brian Krause

Brian has over 30 years of interconnect industry experience, and is currently the vice president of global marketing and communications at Molex Incorporated. I manage the Molex brand as well as the commercialization and promotion of the company’s products worldwide. My responsibilities include advertising, public relations and employee communications. I also oversee Molex's Web site, strategic planning, and the company's internally developed Demand Creation Process, which helps identify new growth segments and customers.

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  • Hello Brian,

     

    I'm working on a PIC32-base project that I want to build in modual displays. The display in particular I'm looking at is a 160x128 OLED with a SEPS525 driver. Part of my design principle is that I have to drive data to the display at 50 Hz and I'm limited to 16-bit color for the sake on simplicity. This means I cannot use to slow, 10 MHz, SPI bus so then I have to use an 8-bit parallel connection on the PIC32. This means I need up to a 13 pin cable and connection to the PCB. Due to the size of the screen and other components, I need a small connector. The mDP receptor, 105081-0001105081-0001, and associated cables seems to be perfect.

     

    Here is my question: with a minimum length of 3ft/1m for DisplayPort cables, will I have to worry signal integrity and thus speed?

     

    Thank you,

    Michael

  • in reply to Former Member

    Display port cables are not designed for 8 bit // transmission and you may not be able to send all your signals up the same type of core which may make for some problems. There are only 4 high speed pairs (I couldn't find  a detailed cable spec without registering on VESA's website).

    You will need to do some testing to check the signal integrity and you may need to terminate the signal correctly.

    If your connectors are accesible on the outside of your equipment you will need to protect ths signal lines (from ESD) to comply with CE marking regulations.

     

    MK

  • in reply to michaelkellett

    Michael,

     

    It looks like the creator has become active in the community he started the project for. He was also able to graciously answer some of my questions. Found out that the OLED driver, the SEPS525 keeps the its RAM persistent when in windowed mode. This means that I can redraw just a small portion of the scree for an update and I don't have to constantly re-write the frame buffer. This means my 20 Mhz SPI w/ 80 MHz CPU or 25 MHz SPI w/ 50 MHz CPU, I should easily be able to driver 3, 160x128 displays without much issue. If I need to re-draw all three displays, I'm looking at maybe 50 to 70 ms with overhead which is perfectly ok every now and then.

     

    With only 2 lines requiring significant protection from noise, spec sheet says SDO on the SEPS525 to be tied to ground, I temped to stay with mDP unless there are any other inexpensive connection schemes that give me 2 sheilded cores and >=5 other cores. HDMI is less expensive but much harder to find Mini to Mini or Micro to Micro cables since they are not technically in the spec. At the same time, I'm not tied to a video cable but require a round cable.

     

    Thank you

Reply
  • in reply to michaelkellett

    Michael,

     

    It looks like the creator has become active in the community he started the project for. He was also able to graciously answer some of my questions. Found out that the OLED driver, the SEPS525 keeps the its RAM persistent when in windowed mode. This means that I can redraw just a small portion of the scree for an update and I don't have to constantly re-write the frame buffer. This means my 20 Mhz SPI w/ 80 MHz CPU or 25 MHz SPI w/ 50 MHz CPU, I should easily be able to driver 3, 160x128 displays without much issue. If I need to re-draw all three displays, I'm looking at maybe 50 to 70 ms with overhead which is perfectly ok every now and then.

     

    With only 2 lines requiring significant protection from noise, spec sheet says SDO on the SEPS525 to be tied to ground, I temped to stay with mDP unless there are any other inexpensive connection schemes that give me 2 sheilded cores and >=5 other cores. HDMI is less expensive but much harder to find Mini to Mini or Micro to Micro cables since they are not technically in the spec. At the same time, I'm not tied to a video cable but require a round cable.

     

    Thank you

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