IMX6Q unused gpio pads connected to external signals

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IMX6Q unused gpio pads connected to external signals

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xray
Contributor III

I'm running an IMX6Q on custom hardware.  I just discovered some errors in my custom PCB that I want to fix with blue wires.  After I solder the blue wires, I'll have IMX6 GPIO pads that I don't want to use anymore but will still be connected to external signals on my board.  What is the best way to set these unused GPIO pads in the IOMUXC so they have no affect on the external signals.  Can the pads be tristated? or set to always be inputs?

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Yuri
NXP Employee
NXP Employee

General recommendations for unused pins  :

DIGITAL INPUT RECOMMENDATIONS

For unused inputs that are muxed with GPIO :

- Configure pins to be GPIO.

- Configure pins to be inputs.

- Make sure the internal pull up resistors are enabled.

For unused inputs that are not mux-ed with GPIO pins :

- Connect each pin with a 10K Ohm resistor to ground.

DIGITAL OUTPUT RECOMMENDATIONS

Leave the unused output pins floating.

  Also please refer to recommendations of Table 2-21 (Recommended

connections for unused analog interfaces) of "Hardware Development Guide

for i.MX 6 ..."

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf


Have a great day,
Yuri

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