Critical Warning 16248 (pin is placed too close with ADC pins) and TSD use.

Hi ,

Kindly find the below KDB for your reference. Maybe there is a chance of generation of noise by the GPIO pin, So better to follow the Quartus recommendation.

https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/solutions/rd03032016_970.html

Similar case

https://forums.intel.com/s/question/0D50P000042PPLJSA4/critical-warning-16248-pin-is-placed-too-close-with-adc-pins

Regards,

Anand

Hi,

i've read both link you've mentionned.

However in both cases, analog inputs are used with the ADC. In my case i only want to use the TSD, so no analog pins are used. Is the temperature sensor is impacted by the GPIO close to ADC pins ?

Hi,

It should not be an issue if you are not using analog pins of ADC and using appropriate banks for IO.

1. Can you share information on the part number & IO banks used?

Regards

Anand

Hi

FPGA: MAX10, 10M40DAF484-I7G

IO Bank i used: 1B, 2, 3, 4, 5, 6, 7 and 8 (all except 1A)

And, i confirm that i don't use analog inputs (and it is not planified).

Hi,

Is the temperature sensor is impacted by the GPIO close to ADC pins ?

Yes, ADC Sampling is influenced by analong input and refrence voltages.

TSD data need to be sampled by with refrence voltage.

Try to avoid IO bank 1A , 1B & 8.

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

Regards

Anand

I don't understand your answer.

You said that ADC Sampling is influenced by analog inputs. I agree, i read this point too in the IntelFPGA documentation. But TSD doesn't use input how it can be influenced by GPIO?

"TSD data need to be sampled by with refrence voltage" -> does it means by using an external reference voltage ? Or using internal reference is enough ?

Moreover i checked my pinout, and i use too many pins on those banks (1B and 8) to move them to the other banks.

okay,

TSD data need to be sampled by with reference voltage, We can use both internal/external reference voltage.

For your requirements, you can use Internal VREF & you can safely ignore the Critical Warning.

If we are not using ADC pin.

Regards

Anand