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DLPC200 Handling method of unused pins

Other Parts Discussed in Thread: DLPC200

Hello

I have two questions about DLPC200.

1)How should  unused pins be handled during design,when not using Port1(HDMI) and Port2 data interface?

  (NC or VDD or GND?)


2)How should reserved pins be handled during design?
 
  Can be used for testing and debugging purposes of DLCP200?

 


Regards,

Seishin

  • Hi Seishin,

    1) The unused pins are NC

    2) Most of the RSVD pins are NC and some are GND. Refer to DLPC200 datasheet for specific to be connected to GND.

     

    Regards,

    Sanjeev

     

  • Hi Seishin,

    The DLPC200 data sheet link http://www.ti.com/lit/gpn/dlpc200

    Regards,

    Sanjeev

     

     

  • Hi,

    In our customer's system does not use the PORT1 and PORT2 and LED interface.

    Handling of the current board is as follows.

    Handling of Unused pin has been added in Rev.E of DLPC200 data sheet.

    I want you to tell me if there is one that bad affects the normal operation in these handling of unused pins.

    Terminal name         I/O TYPE          Current system

    PWM0-3                        O                        OPEN(NC)
    LED_IR_EN                  O                        OPEN
    LED_RED_EN              O                        OPEN
    LED_BLU_EN               O                        OPEN
    LED_SUBFRAME         O                        OPEN
    SYNC_0-2                     O                        OPEN
    /LED_EN                       O                        OPEN
    LED_SYNC                   O                        OPEN
    LED_SYNCEN              O                        OPEN
    /LED_LIT                        I                        1-kΩ pullup to 3.3 V
    LED_SENS                    I                        1-kΩ pulldown to DGND
    LED_SPI_CLK              O                         OPEN
    /LED_SPI_CS                I                          OPEN
    LED_SPI_DIR               O                         OPEN
    LED_SPI_MISO             I                         1-kΩ pullup to 3.3 V
    LED_SPI_MOSI            O                         OPEN

    PORT1_CLK                  I                100-kΩ pullup to 3.3 V
    PORT1_VSYNC             I                          OPEN
    PORT1_HSYNC             I                          OPEN
    PORT1D0-23                 I                           OPEN
    PORT1_HPD                 B                         100-kΩ pullup to 3.3 V
    PORT1_SYNCDET                                   OPEN

    PORT2_CLK                  I                 100-kΩ pullup to 3.3 V
    PORT2_VSYNC            I                           OPEN
    PORT2_HSYNC            I                           OPEN
    PORT2_IVALID             I                           OPEN
    PORT2_D0-23               I                           OPEN

    PORT1_Trig_in              I                           OPEN
    PORT1_Sync_out         O                          OPEN
    PORT2_Trig_in              I                           OPEN
    PORT2_Sync_out         O                          OPEN

    Best regards,
    Seishin

  • Hello Seishin,

    Looking at your list, since your customer have already designed board, all we can say is that, the O/P pins not a problem, but input pins to DLPC200 are very important. Ideally referring to Rev E is best.

    The below lines are processed and certainly impact behavior of DLPC200, we suggest re-look at these lines at the minimum.

    PORT1_CLK    I     100Ω pullup to 3.3 V  //Why was 100KOhm chosen? Suggest to use 10K to DGND

    PORT1_Trig_in       I      OPEN // Suggest to use 10K to DGND

    PORT2_CLK   I   100-kΩ pullup to 3.3 V  //Why was 100KOhm chosen? Sugegst to use 10K to DGND

    PORT2_Trig_in       I      OPEN //Suggest to use 10K to DGND

    rest things we can live with.

    Regards,
    Sanjeev

  • Hello Sanjeev-san,

    Thank you very much for your prompt reply.

    We also do not know why choose a 100kΩ pull-up.

    We will suggest modifications to the DGND with 10kΩ to customer.

    Regards,
    Seishin

  • Hi Sanjeev-san,

    I'm sorry for asking you to confirm that so many times.

    Pull-down purpose to GND of these 4 lines.

     ①To reduce the effects of noise.

     ②A GND(Low) level is required for internal operation of DLPC200.

    Which reason is it?

    Thank you so much for answering all my questions.

    Regards,
    Seishin

  • Hello Seishin,

    Reason (1) is correct.

    Basically any noise on this signal and based on the DLPC200 configuration state (like configured to video port or configured to external trigger mode) chances of detecting false trigger. If these signals not used, better to connect DGND.

    Regards,

    Sanjeev