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Thread: Doubts with non connected pins of XMC4800 microcontroller

  1. #1
    New Member New Member vinayshasyagar is on a distinguished road
    Join Date
    May 2018

    Doubts with non connected pins of XMC4800 microcontroller

    Hello...I am using XMC4800 microcontroller for EtherCAT application. For my application HIB_IO pins are not required. I am providing an external coin cell battery of 3V to VBAT pin. So my question is, is it safe to just leave the HIB_IO pins non connected? If it is not safe Please tell me whether I should connect a pull down or pull up resistor. Also I have not used some of the GPIO pins. So is it safe to leave them non connected. Please help me to find out.

    Thank You

  2. #2
    Beginner Beginner Daniel.Sanchez is on a distinguished road
    Join Date
    Aug 2018
    Nobody reply?
    I have the same doubt.

  3. #3
    Beginner Beginner S R is on a distinguished road
    Join Date
    Aug 2018
    I don't know on the XMC4000s, but a lot of datasheets will either specifically say to leave non-connected, or common knowledge is to tie them either to ground or power. You don't want a floating input, can be a big waste of power. There are lots of topics on this.

    For your non-GPIO ethernet pin, I'd check their reference manual and copy whatever they did.

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