USB Vregin input - MK64

[roymessinger]

I'm designing a board based on the MK64 (the FRDM K64 is my reference design). I do not use the USB features of the MK64. I am using the UART capabilities (using USB dongle to RS485 cable from a far host PC to my controller board, then to UART inputs on the MK64 via a MAX3362 RS 485 Transceiver).

In such case, do I need to connect a voltage to that pin?

Leave it float?

Thanks!

[roymessinger]

Ok.

Thank you very much!

I've posted another question regarding un used I/O's and output state at reset.

Can you amswer that also?

[Robin_Shen · Accepted solution]

Hi Roy,

Connect VREGIN and VOUT33 together and tie to ground through a 10kΩ resistor.

Best Regards,

Robin

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