Currently I have start working on MSP430 Controller and found that there are 4 pins for the supply voltage viz. AVcc, DVcc, AVss, DVss. These are used as analog supply voltage and Digital supply voltage. What are the purpose of providing these twins pins? How can I use these pins during designing of supply section.
Electronic – Analog and Digital supply voltage
microcontrollermsp430
Best Answer
Your digital supply can be quite noisy and you will get away with that in many digital applications but, that noisy supply would not be good enough for an analogue to digital convertor in most cases. Also, your ADC may have the option of using the analogue supply as its analogue reference input - this would then require the analogue supply to be much more stable than the digital supply in order to get best accuracy from the ADC when doing conversions. So in summary: -
If your digital supply is quite clean and you are not going to use the ADC reference tied to this supply then in most cases on MCU designs you can connect them together but it is application dependent and you need to provide more details.