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Measuring low voltages with STM8L051F3

Question asked by johnson.thor on Feb 24, 2015
Latest reply on Apr 27, 2015 by Martin Davey
I have an input signal of 0.2V that I want to digitize; questions:
       
  1. Does the STM8L051F3 have a vref bandgap inside?  Can I use that instead of VDD?
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  3. What is the least expensive chip that supports an external vref?
  4.    
  5. Can someone explain how the vref bandgap is used?
Looking at the docs, it says that you can measure internal vref on an ADC channel... but wouldn't that just give you a 4096 count result (vref=vref)?

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