If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
When IC is powered by 5V (in the second case), VDD voltage is clamped by adapter voltage, until VSYS is brought up. The step is caused by source switch to VSYS.
This is not the case when adapter is >6V, or 20V in the first case, where VDD is always "fully" on.
