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TMDSCNCD280039C: VDD and VDDIO pins on Control Card

Arun Ashok
Prodigy 90 points
Part Number: TMDSCNCD280039C
Other Parts Discussed in Thread: C2000WARE,

Hi Team,

We are creating hardware for a new motor control project with F280039C control card. From the control card pinout revB, we are not sure about the connections to pins VDD (118) and VDDIO (119). Should these pins be left floating (as in the image below) or do we have to connect 3.3V rails to them? 

Thanks for the support.

  • 0
    TI__Mastermind 27411 points

    Hello Arun,

    I'm not sure what schematics you are referring to. For revB of TMDSCNCD280039C, all the VDD and VDDIO pins are connected. 

    You can find the controlCARD schematics in the latest C2000ware.

    <c2000ware_install_dir>\boards\controlCARDs\TMDSCNCD280039C\Rev.B

  • 0 in reply to Gus Martinez
    Prodigy 90 points

    Hi Gus,

    I guess the circuit you shared is the schematic of the control card. My schematic image is referring to the hardware interface to the 180pin docking station. The hardware on my inverter main board is expected to power the control card through the docking station. In this case since I am already feeding 5V and GND to the control card (as shown in the image), should I leave the pins 118 and 119 floating? I hope that makes it clear. 

    Thanks and Regards,

  • +1 in reply to Arun Ashok
    TI__Mastermind 27411 points

    Arun,

    Ok, if I understand correctly, you are designing a main/base board that will accept the F280039C controlcard. In that case, you only need to provide the 5V to the controlCARD. The LDO on the controlCARD will generate the required 3.3V for the MCU. On the controlCARD the internal voltage regulator of the MCU is enabled, so it will generate the required 1.2V rail. 

    The VDD and VDDIO inputs on the controlCARD docking station standard are there if you choose to generate these rails on your base board. In this optional case, you would need to disable the LDO on the controlCARD and supply 3.3V directly to the controlCARD. You could also supply the 1.2V rail directly by disabling the internal VREG of the MCU (by pulling the VREGENZ pin high on the controlCARD).

  • 0 in reply to Gus Martinez
    Prodigy 90 points

    Thanks Gus. That helps.