On a processors such as the KL27 family, either the bandgap voltage reference or VREF can be used as reference inputs to the ADC. This leads to two questions:
- Since VREF is actually derived from the bandgap voltage reference, when (and why) would you use VREF as a reference input rather than the bandgap voltage reference?
- What is the bandgap voltage? Some documents suggest that it is 1.0 V, other documents suggest that it's 1.2V. (I guess the real question is: where do I find the electrical specifications for the KL27 family of processors, in particular Vbe?)