S32K3xx SAR ADC resolution

seanwu — Fri, 29 Aug 2025 01:33:33 GMT

Dear sir,

I see S32K3xx SAR ADC supports max 12bit resolution in spec.

But the conversion resolution in example code from RTD is 14 bit(Adc_Sar_Bctu_Ip_example_S32K344, SAdc_Sar_Bctu_Ip_example_S32K396). Why? and it works?

Thanks.

BR,

Sean Wu

Re: S32K3xx SAR ADC resolution

Robin_Shen — Fri, 29 Aug 2025 05:59:40 GMT

Hi Sean,

Section 60.2.2 Features of the S32K3XXRM states:
•Selectable resolution (8-, 10-, 12-, 14-bit). Note that the conversion result is always 15 bits wide, even if the selected resolution is smaller (see CALBISTREG[RESN]).

S32K3 DataSheet states: TUE spec for precision and standard channels is based on 12-bit level resolution.
If you set the resolution to 14-bit, the TUE is only slightly better than that of 12-bit resolution.

Best Regards,
Robin
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S32K3xx SAR ADC resolution

Re: S32K3xx SAR ADC resolution