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KL28 ADC clocking - how to use other sources than the ADCK?

Question asked by Mark Butcher on Nov 13, 2017
Latest reply on Nov 17, 2017 by Mark Butcher

Hi All

Has anyone worked with the KL28's ADC but not using its internal asynchronous clock source?


The NXP examples that I have seen all use the ADC's internal clock rather than a PCC selected clock source but I haven't been able to get the ADC to calibrate when connecting other sources (bus clock, fast IRC, etc.) although I believe that they should be correctly in range. When I use the internal clock source it does operate.


The KL28 is one of the first with a PCC and SCG to control clocks and peripheral clock sources, whereas I never had issues with using the bus clock in many other parts.


Anyone know the trick needed!