i.MX 6ULL ADC usage

[sugiyamatoshihi]

Hi, 

I have a question about how to use ADC of i.MX 6ULL.

When I checked IOMUXC_SW_MUX_CTL_PAD_GPIO1_IO01 register in Reference manual. There is no ADC selection in MUX_MODE.

Should it select GPIO1_IO01 ALT5 in MUX_MODE for ADC input?

Best Regards,

Sugiyama

[art · Accepted solution]

There is no special IOMUX mode for the ADC input in the IOMUX Pad Configuration register since the ADC inputs are always connected to the corresponding pads. To minimize the possible signal contention and measurement error, the ADC input pad should be configured as GPIO (ALT5) input with no pull-up/pull-down/keeper circuit enabled.

Best Regards,

Artur