RT117x: ADIN protection

[ak2]

Hi,

Does the analog input pin with
   VREFH = 1.8V,
   CSACAL = 1 and
   3V3 GPIO_NVCC mode
need a protection against voltage levels above 1.8V or is a protection for values above 3.96V sufficient?

Thanks for the help!

[kerryzhou · Accepted solution]

Hi @ak2 ,

   From the RT1170RM, we can know some information:

But, if you define CSACAL = 1, then it is Full scale (Factor of 1), 

So, the input voltage should follow this table:

can't above 1.8V, thanks.

If the CSACAL = 0, you can input 3.3V.

Wish it helps you!

Best Regards,

Kerry

[ak2]

Thank you!

As you mention, I will set CSCALE to 0.