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External resistor for my oscillator design

Aldo_Flores_Aguayo
Associate II

Hi, I have a question about this highlighted text in the AN2867 document refering to the "calculating external resistor" paragraph 

Aldo_Flores_Aguayo_0-1750110581049.png

As I understood the condition to use a Rexternal is "if the power disipated in the crystal is higher than the value specified by the crystal manufacturer", as shown above so my question is how to check the power dissipated in the crystal? how to know if I`ll need to use Rext before have a physical implementation of my MCU thanks for your help

One more extra question (not a technical one) is it normal to feel a little bit overwelmed some times doings this kind of desing? (is my first time designig the STM32 MCU lets say from scratch) 

 

Thanks!

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