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TMDSDOCK28379D: Docking station Pin map mismatch

Mausamjeet Khatua
Intellectual 345 points
Part Number: TMDSDOCK28379D

Hello,

The schematic of the docking station (TMDSCNCD28377D_180cCARD_pinout_R1_3) says PIN 13 and 29  are ground connected and PIN 16 is connected to +5V supply. However when I did a connectivity test on the hardware I found that these three pins are not connected to the correct terminals (not sure what they are actually connected to). Rest of the pin connections are fine. Can somebody explain this or am I missing something here?

Thanks

  • 0
    TI__Mastermind 41445 points

    Mausamjeet,

    Pins 13 and 29 are 'no-connects'. They are not connected to anything.

    The document you are looking at describes both the controlCARD standard as well as GPIO/Analog assignments. I can see how this is confusing, in the case of the pins that you mentioned.

    Look at the schematic, it can be found in the same directory that you found the pinout document.

    Pin 16 is also a 'no-connect', but it will never be connected to +5V, in the controlCARD standard it is listed as a 'GND'.

    In short, the document you are looking at is good for pin assignments, but not for power/ground assignments. For those please look at the schematic for the respective controlCARD.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Intellectual 345 points

    Cody,

    Thanks for replying. You are right . I checked the schematic and these pins are indeed no connects. I am designing my own docking station for this control card. I will be following the schematic to assign +5V and GND connections. I will program it using USB. In that case I will not need to provide any other external power supply (+3.3 V) or any other connections just to program the device. Am I right? 

    Thanks

    Regards

    Mausamjeet

  • 0 in reply to Mausamjeet Khatua
    TI__Mastermind 41445 points

    Mausamjeet,

    correct that should work to power and program the controlCARD. The controlCARD steps down the 5V input to 3.3V on the card so that all you need to provide is 5V.

    Depending on your baseboard you may want to provide a precision buffered ADC reference, this isn't a requirement as we have some references on the controlCARD but its something to think about. 

    Regards,
    Cody