I.MX6 unused pins

[vigneshvasudeva]

Hi,

We are using I.MXQ in one of our solutions. I would like to know the best way of dealing with Unused peripheral pins to bring down the Static Power Consumption.

Kindly refer to the image for clarity on which unused pins I am referring to.

Should I leave such pins unconnected so that internal pull resistor will help to keep the pins in a known state? If yes, let me whether all the internal pull resistors are enabled by default.

or

Should I directly terminate the pins by connecting to Ground? Request you to help us in understanding the best practice.

[Yuri]

Generally  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 muxed 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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[vijayan]

I have the processor with lot of Input pins which are not muxed with GPIO. In this case, I need to provide more 10K resistors on the PCB. This will consume more area on PCB. Is there any other way to terminate this input pins ? I am using iMX6 sololite processor

[Yuri]

As for the i.MX6 SL, please use section 1.8 (Unused analog interfaces) of
"Hardware Development Guide for i.MX 6SoloLite".

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6SLHDG.pdf?fasp=1

Also, from the design Checklist : "NC contacts are no connect and should be floated."

~Yuri.