S32K116 ADC - Maximum possible sampling time

[markus1]

Hello,

in order to reduce my BOM count in a current project, I would like to maximize the sampling time of the ADC. Thereby, I try to achieve that the output impedance of my temperature sensor is sufficient to drive the ADC sampling capacitor incl. analog bus capacitance.

What I already did:

1) Set ADC clock to SIRCDIV2_CLK (8 MHz)

2) Set ADC clock prescaler to 8

3) Set sample ticks to 255

This should result in a sample time of 256us.

Is there a way to further increase the sample time? E.g. using pretrigger and trigger?

Best regards,

Markus

[danielmartynek · Accepted solution]

Hello Markus,

You would need to prescale the ADC input clock,

in this case SIRCDIV2_CLK (SCG_SIRCDIV[SIRCDIV2]).

Regards,

Daniel