LPC Microcontrollers中的主题 Re: Reading ADC problem

Reading ADC problem

nitin_kanani — Wed, 17 Jul 2019 10:00:32 GMT

Hello,

ADC driver version : 2.3.1.

I have used ADC0 channel number 4 and 5.

Issue : If I change the value of channel 4 using potentiometer than it affects channel number 5 too.
So I didn't get actual result of channel number 5.

I have attached source code. Please check/review it. ADC related file is fsl_adc_basic.c.

Kindly let me know if anybody have faced the same issue before. Does anyone have solution for the issue?

Regards

Nitin Kanani

Re: Reading ADC problem

jeremyzhou — Thu, 18 Jul 2019 07:07:30 GMT

Hi Nitin Kanani,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
According to your statement, you suspect that the ADC channel 5 conversion result is not right, as the ADC channel5 will affect it, is it right?
I was wondering if you can introduce the complete testings you did and the results. It can help to figure the phenomenon out.

Have a great day,
TIC

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Re: Reading ADC problem

nitin_kanani — Thu, 18 Jul 2019 09:27:10 GMT

Hi,

thanks for your quick reply

If i increase input of ADC channel 4 parallel then ADC channel 5 also increase decrease.

Thank You

Nitin Kanani

Re: Reading ADC problem

jeremyzhou — Fri, 19 Jul 2019 07:35:09 GMT

Hi Nitin Kanani,

Thanks for your reply.
I do some testings on OM13098, as you mention, tuning the voltage of ADC channel 4 will influence the ADC channel5 conversion result when ADC channel5 is floating, however, I find that this influence is ignorable when the ADC channel5 connect a sample voltage signal.
Have a great day,
TIC

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