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DLPC350 reserved pins

Ted H
Intellectual 275 points
Other Parts Discussed in Thread: DLPC350

On sheet 16 of the DLP4500EVM schematic, there are pull-up resistors on the four 12C pins (J3, J4, M2 and M3).  When using the DLPC350 on my own board design, would these resistors be necessary if I am not using these ports? 

On sheet 17 of the schematic, there are three pull-up resistors on reserved pins D1, C1 and D2.  Are these resistors required if not using the associated test points in my design?  On the same sheet, if I will not be using the UART0 port, should I place resistors on the unused inputs (pins L20 and L21)? 

  • 0
    TI__Expert 6995 points

    The signals J3, J4, M2, and M3 are bidirectional signals with no internal pull-ups. To prevent the possibility of floating inputs, please follow the recommendations of the data sheet: "Requires an external pullup to 3.3 V. The minimum acceptable pullup value is 1 kΩ."

    As described in the data sheet reserved pins D1 is an input pin, so it needs a pull-up to prevent a floating input. C1 and D2 are bidirectional pins, to prevent the possibility of floating inputs, please place pull-ups.

    If you are not using the UART0 pins, then place pull-ups in the inputs: UART0_RXD (L21), UART0_CTS (L20) to prevent possibility of floating inputs.

    Best regards,

      Pedro