i.MX RT1050 NVCC_SD0 operating conditions

[audio]

Hello,

I need to control several ICs with i.MX RT 1050 and most of the I/Os are on 3.3V, but I have 3 pins that I have to control using 1.8V.

So rather than level shifting i/MX RT's 3.3V to 1.8V, I was thinking of using the NVCC_SD0 bank (GPIO_SD_B0_00~05) as the 1.8V GPIO controller.

I intuitively think this should work without a problem, but I couldn't find any warnings that I can mix up 3.3V and 1.8V supplies for each GPIO NVCC.

Do I have to match all the voltage levels for all NVCC_XX?

Thank You

[victorjimenez · Accepted solution]

Hello Brian, 

As long as you apply voltages that are within the allowed range you won't have any problems if you have one power rail at 3.3 volts and other at 1.8 volts. One important thing to keep in mind is that if you apply 1.8 volts to one power rail, then all the pins that work with that power rail will work at this voltage. 

Have a great day,

Victor

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[audio]

Hi Victor,

I have a followup question. If I don't plan to use the GPIOs in the NVCC_SD0 group, do I still need to power the NVCC_SD0 pin?

I saw that I have to supply the VDDA_ADC_3P3 even if I don't use the ADCs, but I haven't seen this kind of caution on the NVCC_SD0 pin in the data sheet.

Is there any information on this in the datasheet?

Regards

Brian

[audio]

Hi Victor,

Thanks for the information. I will make sure all the pins use the same voltage.

Best regards

Brian