I am a bit confused about the allowed voltages on the ADC pins of the Kinetis K.
a) In section 4 of the data sheets, we have the pin ratings: Vdio is defined as -0.3 to 5.5 volt, and Vaio as -0.3 to Vdd+0.3 volt, where Vaio is for the pure analog pins and Vdio for mixed pins.
b) In section 6 we have the ADC spec, and it states that Vadin must be between Vref low and Vref high.
When I now have a voltage on a pin that satisfies a), but falls outside b), what will happen:
- may I have the pin connected to an analog function, even it if falls outside Vaio?
- may I start an A/D conversion?
The reference manual already tells me that the ADC will clamp values outside Vref low and Vref high to the lowest/highest possible conversion result.