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ADC external reference usage on MKL33

Question asked by elliot white on May 4, 2017
Latest reply on May 11, 2017 by Bob Paddock

In order to reduce power usage I need to turn off the analog part of the circuit, If I have understood the data sheets

for the MKL33P80  correctly the following (outline) diagram should work (I hope).

 

ADC referenced power

I assume that the VREFs when configured correctly are effectively connected to the ends of the resistor chain in the SAR, and that when disabled (BJT off) it is ok to have VREFN float upto VDDA.

 

Any assistance would be greatly appreciated

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