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XMC™ Forum Discussions

User15012
Level 1
Level 1
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
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2 Replies
User15589
Level 1
Level 1
First like given 5 replies posted Welcome!
Nobody reply?
I have the same doubt.
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User15596
Level 2
Level 2
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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