K32 L Series MicrocontrollersのトピックRe: S32K311 microcontroller for ADC module

S32K311 microcontroller for ADC module

truptikavadi1 — Thu, 22 May 2025 17:01:22 GMT

Clock source (FIRC) frequency used is 48Mhz.

For ADC having a sampling rate of 1Khz, what will the conversion clock cycles to be configured (INPSAMP)

Re: S32K311 microcontroller for ADC module

davidtosenovjan — Fri, 23 May 2025 15:06:38 GMT

davidtosenovjan_0-1748012572462.png

Based on your configuration with a 6 MHz ADC clock and the maximum allowed input sampling time (INPSAMP = 255), the minimum achievable ADC conversion frequency is approximately 19.35 kHz.

Pay attention to RM, section 60.3.18 Conversion time

Re: S32K311 microcontroller for ADC module

truptikavadi — Wed, 28 May 2025 15:31:42 GMT

But I want the sampling rate to be 1Khz, so how can I configure this in terms of clock cycles

Re: S32K311 microcontroller for ADC module

davidtosenovjan — Thu, 29 May 2025 14:33:50 GMT

So you mean actually triggering rate. I have somehow expected continuous conversions, but you may trigger ADC conversion 1000x per second thus you have conversion rate 1kS/sec.

It is indeed not set by INPSAMP, but it is just application dependent. INPSAMP says how many clocks sampling phase takes.