7 years, 11 months ago.

How to configure manually VREF for ADC (FRDM-K64F)

Hello,

I'd like to modify the reference voltage for the ADC. Currently, it's working from GND to 3.3V and I'd like to use external pins to set my voltage (with a voltage divider). I have understood that i have to configure REFSEL to use an external voltage (V_ALTH and V_ALTL) but i don't know how to link an analog input to these voltage.

Thank you in advance to any one who may be able to give me some ideas

Regards,

Lyricks

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