Is it possible that to apply negative voltage to VREFL

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Is it possible that to apply negative voltage to VREFL

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ilginsarican
Contributor II

Is it possible that to apply negative voltage to VREFL pin(MK60DN512VLL) to measure voltage range -v,+v by using ADC

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395 次查看
Robin_Shen
NXP TechSupport
NXP TechSupport

Hi ilgin,

According to the description of K60P100M100SF2V2, it's impossible that to apply negative voltage to VREFL pin(MK60DN512VLL) to measure voltage range -v,+v by using ADC.

You can use the method described by EARL.

VREFL.png

VSS – VSSA.png

Best Regards,

Robin

 

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egoodii
Senior Contributor III

No, not any negative voltages.  Use a single-to-differential conversion amp, with 'common' set to Vref center, and drive a differential pair of Kinetis pins.

The AD8475, for instance, will take a full bipolar input and shift/attenuate to single-supply-differential converters.

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