external interrupt & A/D conversion

[kappa_am]

Hi all,
I wonder What happen if a PIC MCU receive an PB0 interrupt during an A/D conversion. is there any possibility that this interrupt or several interrupt which are by and by affect the accuracy of AD conversion?:thinker:

Thanks

 

[Easyrider83]

It is completly independed perephireral modules. Nothing will happens.

 

[kappa_am]

Thank you for your reply. I have an accuracy problem in my A/D conversion
If this not affect the accuracy lets check another case that I suspicious to it.

I enable the next channel right after conversion of a channel then I execute some lines then convert the channel to digital. in brief I use execution time of some lines to charge the capacitor of the channel which will be used in next A/D conversion. How about this? is it ok? I think it is. what's your opinion?

thank you

 

[Easyrider83]

Yes, should work. It is popular cheapest capacitence measurment - measure charge/discharge time. You even can do this without ADC. All digital inputs has a schmitt trigger. Accuracy about 10% expected.

 

[kappa_am]

I need accuracy of 2%. I'll try to find the problem by looking through the circuit step by step.

Thank you of your reply and comments