topic Re: S32K3 12bit ADC in S32K

S32K3 12bit ADC

Jon123 — Wed, 04 Dec 2024 08:15:36 GMT

Hello, I want to ask the ADC of S32K3 is 12-bit, but the data register is 15-bit, and the number of bits that can be selected by the software is also the highest 14-bit. Is it over-sampled? For example, a 12-bit ADC evenly samples 64 times, accumulates and divides by 8 to get a 15-bit result. And would like to ask what is the function of the special capacitor, thank you.

Re: S32K3 12bit ADC

PetrS — Wed, 04 Dec 2024 10:15:57 GMT

Hi,

check below thread for sample data alignment explanation
https://community.nxp.com/t5/S32K/S32K344-ADC-data-alignment-and-bit-resolution/td-p/1571229

BR, Petr

Re: S32K3 12bit ADC

Jon123 — Thu, 05 Dec 2024 01:26:47 GMT

Thank you for your answer, but it seems that my expression is not clear enough, which makes this answer not the answer I expected. What I want to ask is, is the original data collected by ADC here 15 digits? After the conversion, the ADC data of 14, 12, 10 and 8 bits are available, but I see that the SAR ADC module is 12 bits in the data manual. I want to know how to extract 15-bit data from this 12-bit module. Thank you.

Re: S32K3 12bit ADC

PetrS — Thu, 05 Dec 2024 13:39:08 GMT

Hi,

result is always 15 bits wide, even though the selected resolution is smaller.
check colleague's feedback too
https://community.nxp.com/t5/S32K/S32K3-Confusion-about-ADC-accuracy-and-results/m-p/2007891/highlight/true#M43912

BR, Petr